NORTEK INC
S-4/A, 1999-02-12
AIR-COND & WARM AIR HEATG EQUIP & COMM & INDL REFRIG EQUIP
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<PAGE>   1
 
   
   AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON FEBRUARY 12, 1999
    
 
                                                      REGISTRATION NO. 333-64731
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- --------------------------------------------------------------------------------
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                      ------------------------------------
   
                                AMENDMENT NO. 2
    
 
                                       TO
 
                                    FORM S-4
 
                             REGISTRATION STATEMENT
                                   UNDER THE
                             SECURITIES ACT OF 1933
                      ------------------------------------
                                  NORTEK, INC.
             (Exact name of registrant as specified in its charter)
 
<TABLE>
<S>                               <C>                               <C>
           DELAWARE                            3634                           05-0314991
 (State or other jurisdiction      (Primary standard industrial            (I.R.S. Employer
              of                   classification code number)          Identification Number)
incorporation or organization)
</TABLE>
 
                50 KENNEDY PLAZA, PROVIDENCE, RHODE ISLAND 02903
                                 (401) 751-1600
               (Address, including zip code and telephone number
        including area code of registrant's principal executive offices)
 
                               KEVIN W. DONNELLY
                       VICE PRESIDENT AND GENERAL COUNSEL
                                  NORTEK, INC.
                                50 KENNEDY PLAZA
                         PROVIDENCE, RHODE ISLAND 02903
                                 (401) 751-1600
               (Name, address, including zip code, and telephone
               number, including area code, of agent for service)
 
                      ------------------------------------
                  Please send copies of all communications to:
                             David C. Chapin, Esq.
                                  Ropes & Gray
                            One International Place
                          Boston, Massachusetts 02110
                                 (617) 951-7000
                      ------------------------------------
     Approximate date of commencement of proposed sale to the public: As soon as
practicable after the effectiveness of the Registration Statement.
     If the only securities being registered on this form are being offered in
connection with the formation of a holding company and there is compliance with
General Instruction G, check the following box. [ ]
 
                      ------------------------------------
                        CALCULATION OF REGISTRATION FEE
 
<TABLE>
<CAPTION>
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                                                              PROPOSED               PROPOSED             AMOUNT OF
      TITLE OF EACH CLASS OF             AMOUNT           MAXIMUM OFFERING      MAXIMUM AGGREGATE       REGISTRATION
   SECURITIES TO BE REGISTERED      TO BE REGISTERED       PRICE PER UNIT         OFFERING PRICE             FEE
- ------------------------------------------------------------------------------------------------------------------------
<S>                                <C>                 <C>                    <C>                    <C>
8 7/8% Series B Senior Notes due
  2008............................    $210,000,000            99.641%              $209,246,100          $61,728.00
- ------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------
</TABLE>
 
     THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT OF 1933 OR UNTIL THIS REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE SECURITIES AND EXCHANGE COMMISSION, ACTING
PURSUANT TO SAID SECTION 8(a), MAY DETERMINE.
- --------------------------------------------------------------------------------
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<PAGE>   2
 
INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A
REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR MAY
OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT BECOMES
EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR THE
SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE SECURITIES
IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE UNLAWFUL PRIOR
TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH STATE.
 
   
                 SUBJECT TO COMPLETION DATED FEBRUARY 12, 1999
    
PROSPECTUS
                                  NORTEK, INC.
 
                               OFFER TO EXCHANGE
     8 7/8% SERIES B SENIOR NOTES DUE AUGUST 1, 2008 FOR AN EQUAL PRINCIPAL
 AMOUNT OF 8 7/8% SERIES A SENIOR NOTES DUE AUGUST 1, 2008. THE EXCHANGE OFFER
   
    WILL EXPIRE AT 5:00 P.M., NEW YORK CITY TIME ON           , 1999, UNLESS
                                   EXTENDED.
    
 
    Nortek, Inc., a Delaware corporation ("Nortek" or the "Company"), hereby
offers (the "Exchange Offer"), upon the terms and subject to the conditions set
forth in this Prospectus (the "Prospectus") and the accompanying letter of
transmittal (the "Letter of Transmittal"), to exchange an aggregate principal
amount of up to $210,000,000 of its 8 7/8% Series B Senior Notes due 2008 (the
"Exchange Notes") of the Company for a like principal amount of the issued and
outstanding 8 7/8% Series A Senior Notes due 2008 (the "Original Notes" and
together with the Exchange Notes, the "Notes") from the holders (the "Holders")
thereof. The form and terms of the Exchange Notes are identical in all material
respects to the form and terms of the Original Notes except that the Exchange
Notes will not contain terms with respect to transfer restrictions (other than
those that might be imposed by state securities laws) or, except in limited
circumstances, provide for the payment of Liquidated Damages (as defined).
Proceeds from the offering of Original Notes (the "Offering") were used to
finance the acquisition of NuTone, Inc., on July 31, 1998 (the "Acquisition").
 
    The Original Notes are and the Exchange Notes will be senior unsecured
obligations of Nortek and will rank pari passu in right of payment with all
existing and future senior unsecured indebtedness of Nortek and senior in right
of payment to all existing and future subordinated indebtedness of Nortek. The
Notes will be effectively subordinated to all existing and future secured
indebtedness of the Company, to the extent of the value of the assets securing
such indebtedness, and to all existing and future secured and unsecured
indebtedness and other obligations of the Company's subsidiaries, except in the
case of unsecured indebtedness and other obligations to the extent any
Subsidiary Guaranty (as defined) is then in force. At October 3, 1998 after
giving pro forma effect to the acquisition of Napco, Inc. ("Napco"), the
Exchange Notes would have been effectively subordinated to approximately $495.2
million of indebtedness for borrowed money, trade payables and accrued
liabilities of the Company's subsidiaries. See "Description of Notes --
General." Subject to certain restrictions, the Indenture (as defined) pursuant
to which the Original Notes were issued and the Exchange Notes will be issued,
permits the Company and its subsidiaries to incur additional indebtedness,
including indebtedness which may be secured. See "Description of
Notes -- Certain Covenants."
 
    Interest on the Exchange Notes will be payable semi-annually on February 1
and August 1 of each year, commencing February 1, 1999. The Exchange Notes will
mature on August 1, 2008, unless earlier redeemed. The Exchange Notes will be
redeemable at the option of the Company, in whole or in part, at any time and
from time to time, on and after August 1, 2003, at the redemption prices set
forth herein, together with accrued and unpaid interest and Liquidated Damages
(as defined), if any, to the date of redemption. Upon a Change of Control (as
defined), holders of the Exchange Notes will have the right, subject to certain
exceptions, restrictions and conditions, to require the Company to purchase all
or any of their Notes at 101% of the principal amount thereof plus accrued and
unpaid interest and Liquidated Damages, if any, to the date of purchase. See
"Description of Notes."
 
    The Exchange Notes are being offered hereunder in order to satisfy certain
obligations of the Company contained in the Registration Rights Agreement, dated
July 31, 1998, among the Company and the other signatories thereto (the
"Registration Rights Agreement"). The Company believes that based on
interpretations by the staff of the Securities and Exchange Commission (the
"Commission"), Exchange Notes issued pursuant to the Exchange Offer in exchange
for Original Notes may be offered for resale, resold and otherwise transferred
by each Holder thereof (other than (i) a broker-dealer who purchased Original
Notes directly from the Company or any of its "affiliates" within the meaning of
Rule 405 under the Securities Act of 1933, as amended (the "Securities Act"),
for resale pursuant to Rule 144A or any other available exemption under the
Securities Act or (ii) a person that is such an "affiliate" of the Company)
without compliance with the registration and prospectus delivery provisions of
the Securities Act, provided that such Exchange Notes are acquired in the
ordinary course of such Holder's business and such Holder is not participating,
and has no arrangement with any such person to participate, in the distribution
of the Exchange Notes.
 
    Each broker-dealer participating in the Exchange Offer (a "Participating
Broker-Dealer") that received Exchange Notes for its own account pursuant to the
Exchange Offer must acknowledge that it will deliver a prospectus in connection
with any resale of such Exchange Notes. The Letter of Transmittal states that by
so acknowledging and by delivering a prospectus, a Participating Broker-Dealer
will not be deemed to admit that it is an "underwriter" within the meaning of
the Securities Act. This Prospectus, as it may be amended or supplemented from
time to time, may be used by a Participating Broker-Dealer in connection with
resales of Exchange Notes received in exchange for Original Notes where such
Original Notes were acquired by such broker-dealer as a result of market-making
activities or other trading activities. The Company has agreed that, for a
period of 180 days, it will make this Prospectus and any amendment or supplement
to this Prospectus available to any Participating Broker-Dealer for use in
connection with any such resale. See "Plan of Distribution."
 
    The Company will not receive any proceeds from the Exchange Offer and will
pay the expenses incident to the Exchange Offer. Tenders of Original Notes may
be withdrawn at any time prior to the Expiration Date. In the event the Company
terminates the Exchange Offer and does not accept for exchange any Original
Notes, the Company will promptly return the Original Notes to the Holders
thereof. See "The Exchange Offer."
                            ------------------------
 
      SEE "RISK FACTORS" BEGINNING ON PAGE 22 FOR A DISCUSSION OF CERTAIN
FACTORS THAT SHOULD BE CONSIDERED BY PROSPECTIVE INVESTORS IN EVALUATING AN
INVESTMENT IN THE NOTES.
                            ------------------------
  THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
 EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
   AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
                               CRIMINAL OFFENSE.
                            ------------------------
 
   
                The date of this Prospectus is February   , 1999
    
<PAGE>   3
 
     The Exchange Offer is not being made to, nor will the Company accept
surrenders for Exchange Notes from, Holders of Original Notes in any
jurisdiction in which the Exchange Offer or the acceptance thereof would not be
in compliance with the securities or Blue Sky Laws for such jurisdiction.
 
     The Exchange Notes will be available initially only in book-entry form. The
Company expects that the Exchange Notes issued pursuant to this Exchange Offer
will be issued in the form of one or more Global Notes (as defined), which will
be deposited with, or on behalf of, The Depository Trust Company (the
"Depositary") and registered in its name or in the name of Cede & Co., its
nominee. Beneficial interests in the Global Note representing the Exchange Notes
will be shown on, and transfers thereof will be effected through, records
maintained by the Depositary and its participants. After the initial issuance of
the Global Note(s), Exchange Notes in certificated form will be issued in
exchange for the Global Note(s) only on the terms set forth in the Indenture.
See "Description of Notes -- Book-Entry, Delivery and Form."
 
     Prior to the Exchange Offer, there has been no public market for the
Original Notes or Exchange Notes. To the extent that Original Notes are tendered
and accepted in the Exchange Offer, a Holder's ability to sell untendered
Original Notes could be adversely affected. If a market for the Exchange Notes
should develop, the Exchange Notes could trade at a premium or discount from
their principal amount. The Company does not currently intend to list the
Exchange Notes on any securities exchange or to seek approval for quotation
through any automated quotation system.
 
     The Company has been advised by Wasserstein Perella Securities, Inc., Bear,
Stearns & Co. Inc., and PaineWebber Incorporated, the initial purchasers (the
"Initial Purchasers") of the Original Notes, that, following completion of the
Exchange Offer, they intend to make a market in the Exchange Notes; however,
such entities are under no obligation to do so and any market activities with
respect to the Exchange Notes may be discontinued at any time.
 
     Pursuant to the Indenture, so long as any of the Notes are outstanding,
whether or not the Company is subject to the reporting requirements of Section
13(a) or 15(d) of the Securities Change Act of 1934, as amended (the "Exchange
Act"), the Company will furnish to all holders of the Notes (i) all quarterly
and annual financial information that would be required to be contained in a
filing with the Commission on Forms 10-Q and 10-K if the Company were required
to file such Forms, including a "Management's Discussion and Analysis of
Financial Condition and Results of Operation" that describes the financial
condition and results of operations of the Company and its subsidiaries and,
with respect to annual information only, a report thereon by the Company's
independent certified public accountants and (ii) all reports that would be
required to be filed with the Commission on Form 8-K if the Company were
required to file such reports. The Company will also file a copy of all such
information with the Commission for public availability (unless the Commission
will not accept such filing) and make such information available to investors or
prospective investors of the Notes who request it in writing.
 
                                        2
<PAGE>   4
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
     The following documents or portions thereof filed with the Commission are
incorporated into this Prospectus by reference:
 
        (1) Nortek's Annual Report on Form 10-K for the fiscal year ended
            December 31, 1997 as amended by the Company's Annual Report on Form
            10-K/A, filed with the Commission on April 20, 1998 (the "Form
            10-K");
 
        (2) Each of Nortek's Quarterly Reports on Form 10-Q and 10-Q/A for the
            periods ended April 4, 1998, July 4, 1998 and October 3, 1998;
 
        (3) Nortek's Current Report on Form 8-K, filed with the Commission on
            September 10, 1997, as amended by the Company's Current Report on
            Form 8-K/A, filed with the Commission on September 12, 1997;
 
        (4) Nortek's Current Report on Form 8-K, filed with the Commission on
            March 12, 1998, as amended by the Company's Current Report on Form
            8-K/A, filed with the Commission on March 18, 1998;
 
        (5) Nortek's Current Report on Form 8-K, filed with the Commission on
            May 7, 1998;
 
        (6) Nortek's Current Report on Form 8-K, filed with the Commission on
            June 15, 1998;
 
        (7) Nortek's Current Report on Form 8-K, filed with the Commission on
            July 15, 1998;
 
        (8) Nortek's Current Report on Form 8-K, filed with the Commission on
            July 28, 1998; and
 
        (9) Nortek's Current Report on Form 8-K, filed with the Commission on
            August 12, 1998.
 
     All other documents filed by the Company with the Commission pursuant to
Section 13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of 1934, as
amended (the "Exchange Act"), subsequent to the date of this Prospectus and
prior to the termination of the Exchange Offer shall be deemed to be
incorporated by reference in this Prospectus and to be a part hereof from the
date of the filing of such documents. Any statement contained in a document
incorporated or deemed to be incorporated herein by reference, or contained in
this Prospectus, shall be deemed to be modified or superseded for purposes of
this Prospectus to the extent that a statement contained herein or in any other
subsequently dated or filed document which also is or is deemed to be
incorporated by reference herein modifies or supersedes such statement. Any such
statement so modified or superseded shall not be deemed, except as so modified
or superseded, to constitute a part of this Prospectus.
 
   
     THIS PROSPECTUS INCORPORATES DOCUMENTS BY REFERENCE THAT CONTAIN IMPORTANT
BUSINESS AND FINANCIAL INFORMATION ABOUT THE COMPANY AND WHICH ARE NOT PRESENTED
HEREIN OR DELIVERED HEREWITH. THESE DOCUMENTS ARE AVAILABLE WITHOUT CHARGE UPON
WRITTEN OR ORAL REQUEST FROM ALMON C. HALL, VICE PRESIDENT, CONTROLLER AND CHIEF
ACCOUNTING OFFICER AT THE COMPANY'S PRINCIPAL EXECUTIVE OFFICES LOCATED AT 50
KENNEDY PLAZA, PROVIDENCE, RHODE ISLAND 02903; TELEPHONE NUMBER: (401) 751-1600.
IN ORDER TO OBTAIN TIMELY DELIVERY OF SUCH DOCUMENTS, ANY REQUEST MUST BE MADE
NO LATER THAN             , 1999.
    
 
                                        3
<PAGE>   5
 
                             AVAILABLE INFORMATION
 
     The Company is subject to the informational requirements of the Exchange
Act, and in accordance therewith files reports, proxy statements and other
information with the Commission. All reports, proxy statements and other
information filed by the Company with the Commission can be inspected and copied
at the Public Reference Room of the Commission at 450 Fifth Street, N.W.,
Washington, D.C. 20549 and at the regional offices of the Commission located at
7 World Trade Center, 13th Floor, Suite 1300, New York, New York 10048 and
Citicorp Center, 500 West Madison Street, Suite 400, Chicago, Illinois 60661.
Copies of such material can also be obtained at prescribed rates by writing to
the Public Reference Section of the Commission at 450 Fifth Street, N.W.,
Washington, D.C. 20549. The public may obtain information on the operation of
the Public Reference Room by calling the Commission at 1-800-SEC-0330. Such
material may also be accessed electronically by means of the Commission's home
page on the Internet at http://www.sec.gov. In addition, such reports, proxy
statements and other information concerning the Company can be inspected at the
office of the New York Stock Exchange, 20 Broad Street, New York, New York
10005.
 
     A Registration Statement on Form S-4, including amendments thereto,
relating to the Exchange Notes offered hereby has been filed by the Company with
the Commission. This Prospectus does not contain all of the information set
forth in the Registration Statement and the exhibits and schedules thereto.
Statements contained in this Prospectus as to the contents of any contract or
other document referred to are not necessarily complete and in each instance
reference is made to the copy of such contract or other documents filed as an
exhibit to the Registration Statement, each such statement being qualified in
all respects by such reference. For further information with respect to the
Company and the Exchange Notes offered hereby, reference is made to such
Registration Statement, exhibits and schedules. A copy of the Registration
Statement and the exhibits and schedules thereto may be inspected or obtained in
the same manner set forth in the immediately preceding paragraph for the
reports, proxy statements and other information referred to therein.
 
                                        4
<PAGE>   6
 
                                    SUMMARY
 
     The following summary is qualified in its entirety by, and should be read
in conjunction with, the detailed information and financial data, including the
Consolidated Financial Statements and Notes thereto, appearing elsewhere in this
Prospectus and incorporated herein by reference. Unless the context otherwise
indicates, references herein to "Nortek" or to the "Company," are to Nortek,
Inc., a Delaware corporation, and its subsidiaries, or, in connection with the
Notes, to Nortek, Inc. as offeror or obligor.
 
                                  THE COMPANY
 
     The Company is a diversified manufacturer of residential and commercial
building products, operating within four principal product groups: the
Residential Building Products Group; the Air Conditioning and Heating Products
Group; the Windows, Doors and Siding Group; and the Specialty Products and
Distribution Group. Through these product groups, the Company manufactures and
sells, primarily in the United States, Canada and Europe, a wide variety of
products for the residential and commercial construction, manufactured housing
and the do-it-yourself ("DIY") and professional remodeling and renovation
markets.
 
     The Company's management team, led by Chief Executive Officer Richard L.
Bready since the end of 1990, has successfully implemented a strategy of
internal growth and growth through acquisitions while selectively divesting
non-core and underperforming businesses. The focus of this strategy has been to
target higher growth, less cyclical segments of the building products industry,
including the general repair and renovation market, the manufactured housing
market and the vinyl windows and siding market. In August 1997, the Company
completed its largest acquisition when it acquired Ply Gem Industries, Inc. and
its subsidiaries ("Ply Gem"), a leading manufacturer of windows, doors and
siding products (the "Ply Gem Acquisition"). The acquisition of NuTone, Inc.
("NuTone") a leading manufacturer and supplier of built-in electrical
appliances, on July 31, 1998 (the "Acquisition") constituted the second largest
acquisition of the Company and the fifth acquisition since the beginning of
1995.
 
     During 1998, the Company sold several of its businesses as well as several
non-core businesses acquired as part of the Ply Gem Acquisition. In addition, on
October 9, 1998, the Company acquired Napco, Inc. ("Napco"). The Company has
evaluated and expects to continue to evaluate possible acquisition transactions
and the possible dispositions of certain of its businesses on an ongoing basis
and at any given time may be engaged in discussions or negotiations with respect
to possible acquisitions or dispositions. See "Recent Developments."
 
     A brief description of the Company's four principal product groups is
provided below. Pro forma 1997 net sales totals set forth below give effect to
the acquisitions of Ply Gem and NuTone as if they had occurred on January 1,
1997 and do not give effect to the acquisition of Napco or the dispositions of
businesses that have occurred in 1998 or may occur in the future. See "Recent
Developments."
 
     Residential Building Products Group (34.0% of pro forma 1997 net
sales).  This Group primarily services the residential construction, DIY and
professional renovation markets and is the largest supplier in North America of
range hoods, bath fans, combination units (fan, heater and light combinations)
and indoor air quality products (such as continuous-ventilation systems and
energy-recovery ventilators). This Group also is one of the leading suppliers in
Western Europe, South America and the Middle East of luxury "Eurostyle" range
hoods. Products are marketed under the Broan(R), Best(R), vanEE(R), Venmar(R),
Rangaire(R) and NuTone(R) brand names.
 
     As a result of the Acquisition, the Company expects this Group to improve
its market position. NuTone is a leading manufacturer and supplier of built-in
electrical appliances for use primarily in residential construction and
remodeling. NuTone has two principal product categories: Ventilation Products
and Bath/ Electronics/Specialty ("BES") Products. Ventilation Products offers
home indoor air quality products, including a full line of exhaust fans, range
hoods, paddle fans and other ventilation products. BES Products offers a wide
variety of primarily electronic home improvement products, including intercoms,
audio speakers, door chimes, central vacuum cleaners and bath cabinets and
accessories. See "Recent Developments" and "The Acquisition."
                                        5
<PAGE>   7
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     Air Conditioning and Heating Products Group (22.7% of pro forma 1997 net
sales).  This Group manufactures and sells air conditioning and heating ("HVAC")
systems for custom-designed commercial applications and for manufactured and
site-built residential housing. This Group's commercial HVAC systems are
designed to meet customer specifications and operate on the rooftops of or
individual floors within commercial offices, manufacturing and educational
facilities, hospitals, retail stores and governmental buildings. Brand names for
commercial products include Governair(R), Mammoth(R) and Temtrol(R). This Group
also designs and sells a broad line of central air conditioners, heat pumps,
furnaces and a wide range of accessories for the manufactured and site built
residential housing market. This Group markets its residential products under
the Intertherm(R) and Miller(R) brand names and recently licensed the use of the
well-known Frigidaire(R), Tappan(R), Philco(R) and Gibson(R) consumer brand
names.
 
     Windows, Doors and Siding Group (26.9% of pro forma 1997 net sales).  This
Group is a leading manufacturer and distributor of vinyl and wood windows and
doors and vinyl siding for use in the residential construction, DIY and
professional renovation markets. The Company believes it is among the largest
suppliers of vinyl windows serving the replacement market in the United States.
The Company also believes it has achieved significant penetration of the home
center distribution channel, within which it is a leading supplier of vinyl
siding and wood windows. This Group markets its windows under the Great
Lakes(R), Vetter(R), Crestline(R) and ProCraft(R) brand names and its vinyl
siding under the Varigrain(R) brand name and the Georgia Pacific label.
 
     Specialty Products and Distribution Group (16.4% of pro forma 1997 net
sales).  This Group manufactures and distributes treated wood products,
specialty lumber and decorative home products which are marketed to home
centers, cooperative buying groups, lumberyards and independent wholesale
distributors for use generally in residential decking, roofing, siding and
landscaping as well as various commercial construction applications. The Company
has sold four of the five businesses in this Group in 1998. The sale of these
businesses did not have a material effect on the Company's operations or
financial position. See "Recent Developments."
 
   
     For the three year period ended December 31, 1997, Nortek's net sales,
operating earnings, earnings from continuing operations before provision for
income taxes and EBITDA from continuing operations grew at a compounded annual
rate of approximately 22.6%, 23.2%, 21.0% and 23.2%, respectively, due to a
combination of internal growth and complementary acquisitions. See "Selected
Historical Consolidated Financial Data." For the nine months ended October 3,
1998 and after giving effect to the Acquisition, the Company's pro forma net
sales, operating earnings, earnings from continuing operations before provision
for income taxes and EBITDA from continuing operations were approximately $1.4
billion, $106.3 million, $40.0 million and $142.8 million, respectively. These
pro forma results do not include approximately $15.0 million in estimated
annualized cost reductions, from year ended December 31, 1997 levels, related to
the Acquisition, that the Company expects to achieve within 12 to 18 months
following the Acquisition. The cost reductions as a result of the Acquisition
are estimates and actual savings achieved could differ materially. See
"Unaudited Pro Forma Condensed Consolidated Financial Data."
    
 
     The Company's principal executive offices are located at 50 Kennedy Plaza,
Providence, Rhode Island 02903-2630 and its telephone number is (401) 751-1600.
The Company also maintains an Internet web site at http://www.nortek-inc.com.
 
                               BUSINESS STRATEGY
 
     The Company seeks to realize consistent, profitable growth principally by:
(i) developing and maintaining leadership positions in market segments which the
Company believes are growing at rates in excess of the overall building products
industry; (ii) opportunistically expanding its product portfolio to achieve
synergies in marketing, distribution and manufacturing; (iii) increasing its
presence in the less cyclical replacement and retrofit market; (iv) operating as
a low cost producer to maintain a competitive advantage; and (v) successfully
completing and integrating strategic acquisitions.

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                                        6
<PAGE>   8
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     Target High Growth Market Segments.  The Company targets those segments of
the building products industry that it believes are experiencing more rapid
growth than the overall building products industry. These targeted segments
include: (i) the general repair and renovation market, which continues to
benefit from the increasing age and size of the U.S. housing stock and the
proliferation of home center chains; (ii) the manufactured housing market, which
has represented an increasing proportion of new housing starts over the past
five years; and (iii) the vinyl windows and siding market, which has cost and
performance characteristics that have resulted in substantially increased
penetration of such products within the new home and retrofit markets. By
increasing its presence in these market segments, the Company seeks to achieve
rates of growth in excess of the overall building products industry. For
example, net sales of the Company's Air Conditioning and Heating Products Group
have grown at an internal compounded annual growth rate of approximately 12.1%
for the five year period ended December 31, 1997, reflecting increasing demand
for replacement products as the installed base of HVAC systems in the United
States has grown.
 
     Achieve Marketing, Distribution and Manufacturing Synergies.  The Company
pursues increased penetration of distribution channels such as home centers and
manufactured home builders which it believes present cross-marketing
opportunities for the Company's expanding portfolio of products. For example,
the recent Ply Gem Acquisition provides the opportunity to market Ply Gem's
vinyl products to the manufactured housing market, in which the Company's HVAC
products maintain a leading position. Similarly, the Company is leveraging Ply
Gem's position as one of the largest suppliers of vinyl siding and wood windows
to home centers to increase the Company's sales of residential building
products. Most recently, the Company entered into agreements to license several
well-known consumer brand names, including Frigidaire(R), Tappan(R), Philco(R)
and Gibson(R), which the Company believes have been well-received by residential
HVAC distributors. The Company also seeks to achieve synergies in manufacturing
and logistics by rationalizing its production processes. For example, the
Company transferred the manufacture of certain "Eurostyle" range hood products
sold into the North American markets from the facilities of Best S.p.A. ("Best")
in Italy to Venmar Ventilation inc.'s ("Venmar") lower-cost Canadian facilities
and also centralized production of its indoor-air-quality products into the same
facilities.
 
     Increase Presence in Less Cyclical Replacement and Retrofit Market.  The
Company seeks to increase its presence in the replacement and retrofit market
and lessen its dependence on the new construction segment of the building
products industry, which is more sensitive to economic cycles. For example, the
acquisition of Ply Gem, which is a leading supplier of windows to the
replacement market, increased the Company's presence in the replacement and
retrofit market. Other businesses of the Company which maintain a significant
presence in the replacement and retrofit market include the Company's HVAC and
ventilation businesses.
 
     Operate as a Low Cost Producer.  The Company employs a combination of
rigorous production controls, advanced manufacturing systems, capital investment
and quality management systems to seek to achieve consistently low cost
operations. To promote cost efficient operations, the Company also centralizes
certain of its overhead functions, including its risk management, tax reporting
and legal functions, and coordinates certain activities of its subsidiaries'
operations, such as purchasing and transportation.
 
     Complete and Integrate Strategic Acquisitions.  The Company has
demonstrated an ability to integrate successfully acquired businesses. In 1995,
the Company acquired Best, Rangaire Company ("Rangaire") and Venmar. Since that
time, the Company has taken numerous actions to integrate these acquisitions
into its Residential Building Products Group, including elimination of corporate
redundancies, rationalization of multiple sales forces and a general
reorganization of product line responsibilities related to its "Eurostyle" range
hood and indoor-air-quality products as described above. Partially as a result
of these actions, operating earnings within the Residential Building Products
Group have increased as a percentage of net sales from 7.9% in 1995 to 10.5% in
1997.
 
     Since acquiring Ply Gem in August 1997, the Company has eliminated expenses
associated with Ply Gem's corporate headquarters, consolidated certain corporate
functions such as accounting, legal, tax and risk management and eliminated
certain underperforming product lines. These actions have resulted in estimated
annualized cost reductions of approximately $24.0 million. In addition, the
Company continues to identify and
 
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                                        7
<PAGE>   9
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rationalize underperforming businesses. During 1998, the Company sold several
non-core businesses acquired through the Ply Gem Acquisition.
 
     Furthering its strategy of building on the strengths of its core
businesses, Nortek acquired NuTone on July 31, 1998. Through the Acquisition,
Nortek expects to increase its sales in several of its core built-in home
ventilation product lines, including exhaust fans and range hoods. The Company
expects the integration of NuTone to create important synergies and cost
reductions in several areas, including distribution, sales, manufacturing,
purchasing and product development.
 
     The Company currently estimates that it can achieve approximately $16.7
million in annualized cost reductions from year ended December 31, 1997 levels,
related to the Acquisition within 12 to 18 months following the consummation of
the Acquisition. The magnitude and timing of these cost reductions represent
estimates and actual savings could differ materially. See "Unaudited Pro Forma
Condensed Consolidated Financial Data."
 
                                THE ACQUISITION
 
     On July 31, 1998, the Company, through a wholly-owned subsidiary, purchased
all of the issued and outstanding capital stock of NuTone, a wholly-owned
subsidiary of Williams plc ("Williams") for an aggregate purchase price of
approximately $242.5 million. In connection with the Acquisition, the Company
assumed NuTone's operating liabilities (other than intercompany borrowings),
including certain liabilities of NuTone concerning post-retirement and other
benefit obligations. The purchase price was funded through the use of the net
proceeds from the sale of $210.0 million principal amount of Original Notes at a
slight discount, which occurred on July 31, 1998, together with approximately
$44.8 million of the cash proceeds received from the Common Stock Offering.
 
   
     Consummation of the Acquisition was subject to a Federal Trade Commission
("FTC") Agreement Containing Consent Order (the "FTC Order"), under the terms of
which the Company was required to divest, at no minimum price, prior to December
31, 1998, all of the assets, properties, business and goodwill of its M&S
Systems LP ("M&S") subsidiary. On December 30, 1998, the Company sold M&S, and
another Nortek subsidiary -- Moore-O-Matic, Inc. ("MOM"), after obtaining the
required FTC approval.
    
 
     The sources and uses of funds used to complete the Acquisition and the
offering of the Original Notes were as follows:
 
<TABLE>
<CAPTION>
                                                              IN MILLIONS
                                                              -----------
<S>                                                           <C>
Sources of funds:
     A portion of the cash proceeds from the Common Stock
      Offering..............................................    $ 44.8
     Gross proceeds from the offering of the Original
      Notes.................................................     209.2
                                                                ------
          Total sources of funds............................    $254.0
                                                                ======
Uses of funds:
     Payment for shares of NuTone common stock..............    $242.5
     Fees, expenses and other costs related to the
      Acquisition and the offering of the Original Notes....      11.5
                                                                ------
          Total uses of funds...............................    $254.0
                                                                ======
</TABLE>
 
     As of July 31, 1998, NuTone had letters of credit and a Canadian credit
line supporting aggregate obligations of approximately $3.2 million. In
connection with the Acquisition, Nortek cancelled the Canadian credit line and
entered into a $10,000,000 standby and trade letter of credit facility of which
a portion is being used to back up aggregate obligations of NuTone of
approximately $1.8 million at October 3, 1998. See "Description of Other
Obligations" for a discussion of the standby and trade letter of credit facility
terms and conditions.
 
     NuTone is a leading manufacturer and supplier of built-in electrical
appliances for use primarily in residential construction and remodeling. NuTone
has two principal product categories: Ventilation Products
 
- --------------------------------------------------------------------------------
                                        8
<PAGE>   10
- --------------------------------------------------------------------------------
 
   
and BES Products. Ventilation Products offers home indoor air quality products,
including a full line of exhaust fans, range hoods, paddle fans and other
ventilation products. BES Products offers a wide variety of primarily electronic
home improvement products, including intercoms, audio speakers, door chimes,
central vacuum cleaners and bath cabinets and accessories. For the nine months
ended October 3, 1998, NuTone had net sales, operating earnings, earnings from
continuing operations before provision for income taxes and EBITDA of
approximately $143.9 million, $16.2 million, $9.1 million and $19.8 million,
respectively.
    
 
     For a more complete description of the Acquisition, see "The Acquisition."
 
                              RECENT DEVELOPMENTS
 
Common Stock Offering
 
     During the second quarter of 1998, the Company completed the Common Stock
Offering, receiving proceeds of approximately $64.3 million of which the Company
used approximately $44.8 million to fund the Acquisition and the balance was
used for general corporate purposes.
 
Dispositions of Businesses
 
     Effective July 10, 1998, the Company sold Universal-Rundle Corporation
("URC"), a wholly owned subsidiary of the Company, as well as a product line
included in the Residential Building Projects Group to Mr. Reed Beidler, an
affiliate of Crane Plumbing, for approximately $33.7 million. URC, which
operated the Company's plumbing products business, had net sales of
approximately $104.5 million in 1997 and was accounted for as a discontinued
operation in the fourth quarter of 1997. The proceeds from the sale of URC were
used for general corporate purposes.
 
   
     During 1998, the Company made several dispositions of nonstrategic assets.
On May 8, 1998, the Company sold Studley Products, Inc. ("Studley"). Studley had
net sales and an operating loss of approximately $22.0 million and $6.1 million,
respectively, for the year ended December 31, 1997, and net sales and an
operating loss of approximately $7.3 million and $1.6 million, respectively, for
the period January 1, 1998 to May 8, 1998 and was treated as an operation held
for sale since the Ply Gem Acquisition. Accordingly, Studley's operating results
are not included in the Company's consolidated financial results. On May 22,
1998, the Company consummated the sale of Sagebrush Sales, Inc. ("Sagebrush")
for approximately $9.1 million in cash. Sagebrush had net sales, operating
earnings (and earnings from continuing operations before provision for income
taxes) and EBITDA of approximately $47.6 million, $0.4 million and $0.7 million,
respectively, for the year ended December 31, 1997 and net sales, operating
earnings (and earnings from continuing operations before provision for income
taxes) and EBITDA of approximately $19.0 million, $0.2 million and $0.3 million,
respectively, for the five months ended May 22, 1998. On July 2, 1998, the
Company completed the sale of Goldenberg Group, Inc. ("Goldenberg") for
approximately $11.0 million, including approximately $2.1 million in notes.
Goldenberg had net sales, operating earnings (and earnings from continuing
operations before provision for income taxes) and EBITDA of approximately $41.3
million, $0.4 million and $1.4 million, respectively, for the year ended
December 31, 1997 and net sales, operating earnings (and earnings from
continuing operations before provision for income taxes) and EBITDA of
approximately $21.5 million, $0.4 million and $0.7 million, respectively, for
the six months ended July 4, 1998. On July 31, 1998, the Company completed the
sale of another Ply Gem business, Ply Gem Manufacturing, which had net sales,
operating earnings (and earnings from continuing operations before provision for
income taxes) and EBITDA of approximately $49.7 million, $2.5 million and $2.8
million, respectively, for the year ended December 31, 1997 and net sales,
operating earnings (and earnings from continuing operations before provision for
income taxes) and EBITDA of approximately $23.3 million, $0.7 million and $0.7
million, respectively, for the seven months ended July 31, 1998. On December 10,
1998, the Company sold Allied Plywood Corporation ("Allied") for approximately
$16.5 million in cash and approximately $7.0 million in notes. Allied had net
sales, operating earnings (and earnings from continuing operations before
provision for income taxes) and EBITDA of approximately $67.3 million, $1.2
million and $1.4 million, respectively, for the nine months ended October 3,
1998. The operating results of Sagebrush, Goldenberg Ply Gem Manufacturing and
Allied are included in the Company's 1997 and 1998 consolidated results from the
date of acquisition to the date of sale. The sale of these businesses did not
have a material effect on the Company's
    
 
- --------------------------------------------------------------------------------
                                        9
<PAGE>   11
 
operating or financial position. On December 30, 1998, the Company sold the
businesses of two wholly-owned subsidiaries: -- M&S and MOM -- to the
Chamberlain Group, Inc. for approximately $27.5 million in cash. M&S
manufactures and sells intercom systems, built-in music systems, central vacuum
systems and related products. MOM sells automatic garage door openers, gate
operators and electronic transmitters. For the year ended December 31, 1997, net
sales, operating earnings (and earnings from continuing operations before income
taxes) and EBITDA of M&S and MOM combined were approximately $37.3 million, $3.4
million and $4.1 million, respectively. For the nine months ended October 3,
1998, net sales, operating earnings (and earnings from continuing operations
before income taxes) and EBITDA of M&S and MOM combined were approximately $31.7
million, $2.7 million and $3.3 million, respectively. As of February 9, 1999
approximately $27.7 million of the proceeds from the sale of Studley, Sagebrush,
Goldenberg, Ply Gem Manufacturing and Allied was used to pay down debt,
including $25.5 million under the Ply Gem Credit Facility. The remaining
proceeds (including the proceeds from the sale of URC, M&S and MOM) of
approximately $84.8 million were used for general corporate purposes.
 
Other Developments
 
     On June 16, 1998, the Company announced the formation of Ventrol Air
Handling Systems Inc. ("Ventrol"), a new corporation for the manufacture of HVAC
products in Montreal, Canada. Ventrol will be a part of the Company's Air
Conditioning and Heating Products Group. Ventrol will fabricate custom air
handling and heat recovery equipment to serve the commercial and industrial
markets in Canada and the eastern United States. As of January 15, 1999,
Ventrol's newly constructed state-of-the-art manufacturing facility was
substantially completed and the company expects to begin filling customers'
orders by the end of the first quarter of 1999. At full capacity, the plant is
expected to occupy 150,000 square feet and employ approximately 230 people.
 
     On October 9, 1998, the Company completed the acquisition of Napco, Inc., a
privately held manufacturer of exterior building products headquartered in
Valencia, Pennsylvania for approximately $81.2 million in cash plus the
assumption of debt of approximately $10.2 million. The acquisition was funded
through the use of unrestricted cash, cash equivalents and marketable
securities. Napco manufactures four principal product lines: (a) vinyl siding,
soffit and accessories, marketed under the American Comfort(R), American
Herald(TM) and American '76(TM) collection labels; (b) vinyl window systems,
marketed under the Premium and American Comfort(R) labels; (c) accessory
products, including aluminum-trim coil, soffit, rainware and related specialty
products; and (d) coil coating. Napco's manufacturing operations are conducted
in three company-owned plants that are located within a few miles of each other
in western Pennsylvania, 25 miles north of Pittsburgh. For the year ended
December 31, 1997, Napco had net sales, operating earnings, earnings from
continuing operations before provision for income taxes and EBITDA of
approximately $91.1 million, $8.6 million, $8.0 million and $10.8 million,
respectively.
 
                                       10
<PAGE>   12
- --------------------------------------------------------------------------------
 
                               THE EXCHANGE OFFER
 
     The Exchange Offer relates to the exchange of up to $210 million aggregate
principal amount of Exchange Notes for an equal aggregate principal amount of
Original Notes. The Exchange Notes will be obligations of the Company entitled
to the benefits of the Indenture relating to the Original Notes. The form and
terms of the Exchange Notes are substantially the same as the form and terms of
the Original Notes except that the Exchange Notes have been registered under the
Securities Act, and hence are not entitled to the benefits of certain
registration rights (the "Registration Rights") granted under the Registration
Rights Agreement and are not entitled to payment of Liquidated Damages (as
defined) (except in certain limited circumstances set forth in the Registration
Rights Agreement).
 
REGISTRATION RIGHTS AGREEMENT.......     The Company and the Initial Purchasers
                                         entered into the Registration Rights
                                         Agreement which grants the Holders of
                                         the Original Notes certain exchange and
                                         registration rights. The Exchange Offer
                                         made hereby is intended to satisfy such
                                         exchange rights. See "The Exchange
                                         Offer -- Registration Rights;
                                         Liquidated Damages."
 
THE EXCHANGE OFFER..................     $1,000 principal amount of Exchange
                                         Notes will be issued in exchange for
                                         each $1,000 principal amount of
                                         Original Notes validly tendered
                                         pursuant to the Exchange Offer. As of
                                         the date hereof, $210 million in
                                         aggregate principal amount of Original
                                         Notes are outstanding. The Company will
                                         issue the Exchange Notes to tendering
                                         Holders of Original Notes on or
                                         promptly after the Expiration Date (as
                                         defined).
 
RESALE OF THE EXCHANGE NOTES........     Based on an interpretation by the staff
                                         of the Commission set forth in
                                         no-action letters issued to third
                                         parties, the Company believes that
                                         Exchange Notes issued pursuant to the
                                         Exchange Offer in exchange for Original
                                         Notes may be offered for resale, resold
                                         and otherwise transferred by any Holder
                                         thereof (other than (i) a broker-dealer
                                         who purchased such Original Notes
                                         directly from the Company or any of its
                                         "affiliates" within the meaning of Rule
                                         405 under the Securities Act for resale
                                         pursuant to Rule 144A or any other
                                         available exemption under the
                                         Securities Act or (ii) a person that is
                                         such an "affiliate" of the Company)
                                         without compliance with the
                                         registration and prospectus delivery
                                         provisions of the Securities Act,
                                         provided that the Holder is acquiring
                                         the Exchange Notes in its ordinary
                                         course of business and is not
                                         participating, and has no arrangement
                                         or understanding with any person to
                                         participate, in the distribution of the
                                         Exchange Notes. Holders of Original
                                         Notes wishing to accept an Exchange
                                         Offer must represent to the Company
                                         that such conditions have been met. In
                                         the event that the Company's belief is
                                         inaccurate, Holders of Exchange Notes
                                         who transfer Exchange Notes in
                                         violation of the prospectus delivery
                                         provisions of the Securities Act and
                                         without an exemption from registration
                                         thereunder may incur liability under
                                         the Securities Act. The Company
 
- --------------------------------------------------------------------------------
                                       11
<PAGE>   13
- --------------------------------------------------------------------------------
 
                                         does not assume or indemnify Holders
                                         against such liability.
 
                                         A Participating Broker-Dealer that
                                         receives Exchange Notes in exchange for
                                         Original Notes held for its own
                                         account, as a result of market-making
                                         activities or other trading activities,
                                         must acknowledge that it will deliver a
                                         prospectus in connection with any
                                         resale of such Exchange Notes. Although
                                         such Participating Broker-Dealer may be
                                         an "underwriter" within the meaning of
                                         the Securities Act, the Letter of
                                         Transmittal states that by so
                                         acknowledging and by delivering a
                                         prospectus, such Participating
                                         Broker-Dealer will not be deemed to
                                         admit that it is an "underwriter"
                                         within the meaning of the Securities
                                         Act. This Prospectus may be used by a
                                         Participating Broker-Dealer in
                                         connection with resales of Exchange
                                         Notes received in exchange for Original
                                         Notes. The Company has agreed that, for
                                         a period of 180 days, it will make this
                                         Prospectus and any amendment or
                                         supplement to this Prospectus available
                                         to any Participating Broker-Dealer for
                                         use in connection with any such
                                         resales. See "Plan of Distribution."
 
                                         The Exchange Offer is not being made
                                         to, nor will the Company accept
                                         surrenders for exchange from, Holders
                                         of Original Notes in any jurisdiction
                                         in which this Exchange Offer or the
                                         acceptance thereof would not be in
                                         compliance with the securities or blue
                                         sky laws of such jurisdiction.
 
                                         All resales must be made in compliance
                                         with applicable state securities or
                                         blue sky laws. Such compliance may
                                         require that resales be made by or
                                         through a licensed broker-dealer. The
                                         Company assumes no responsibility with
                                         regard to compliance with such
                                         requirements.
 
   
EXPIRATION DATE.....................     5:00 p.m., New York City time, on
                                                   , 1999, unless the Exchange
                                         Offer is extended by the Company in its
                                         sole discretion, in which case the term
                                         "Expiration Date" means the latest date
                                         and time to which the Exchange Offer is
                                         extended. See "The Exchange
                                         Offer -- Expiration Date; Extensions;
                                         Amendments."
    
 
CONDITIONS TO THE EXCHANGE OFFER....     The Exchange Offer is subject to
                                         certain customary conditions, which may
                                         be waived by the Company. See "The
                                         Exchange Offer -- Conditions of the
                                         Exchange Offer."
 
PROCEDURES FOR TENDERING ORIGINAL
NOTES...............................     Each Holder of Original Notes wishing
                                         to accept the Exchange Offer must
                                         complete, sign and date the
                                         accompanying Letter of Transmittal, or
                                         a facsimile thereof, in accordance with
                                         the instructions contained herein and
                                         therein, and mail or otherwise deliver
                                         such Letter of Transmittal, or such
                                         facsimile, together with the Original
                                         Notes and any other required
                                         documentation to the Exchange Agent (as
                                         defined) at the address
 
- --------------------------------------------------------------------------------
                                       12
<PAGE>   14
- --------------------------------------------------------------------------------
 
                                         set forth herein. Certain brokers,
                                         dealers, commercial banks, trust
                                         companies and other nominees may effect
                                         tenders by book-entry transfer,
                                         including an Agent's Message (as
                                         defined) in lieu of a Letter of
                                         Transmittal. By executing a Letter of
                                         Transmittal or, in lieu thereof, by
                                         transmitting an Agent's message, each
                                         Holder will represent to the Company
                                         that, among other things, (i) the
                                         Exchange Notes acquired pursuant to the
                                         Exchange Offer are being obtained in
                                         the ordinary course of business of the
                                         person receiving such Exchange Notes,
                                         whether or not such person is the
                                         Holder, (ii) neither the Holder nor any
                                         such other person has any arrangement
                                         or understanding with any person to
                                         participate in the distribution of such
                                         Exchange Notes and that such Holder is
                                         not engaged in, and does not intend to
                                         engage in, a distribution of Exchange
                                         Notes, and (iii) that neither the
                                         Holder nor any such other person is an
                                         "affiliate," as defined in Rule 405
                                         under the Securities Act, of the
                                         Company. See "The Exchange
                                         Offer -- Procedures for Tendering."
 
SPECIAL PROCEDURES FOR BENEFICIAL
HOLDERS.............................     Any beneficial owner whose Original
                                         Notes are registered in the name of a
                                         broker, dealer, commercial bank, trust
                                         company or other nominee and who wishes
                                         to tender in the Exchange Offer should
                                         contact such registered Holder promptly
                                         and instruct such registered Holder to
                                         tender on such beneficial owner's
                                         behalf. A form of Instruction to
                                         Registered Holder from Beneficial Owner
                                         is included with the applicable Letter
                                         of Transmittal enclosed with this
                                         Prospectus for the convenience of such
                                         beneficial owners. See "The Exchange
                                         Offer -- Procedures for Tendering."
 
GUARANTEED DELIVERY PROCEDURES......     Holders of Original Notes who wish to
                                         tender their Original Notes and whose
                                         Original Notes are not immediately
                                         available or who cannot deliver their
                                         Original Notes, the Letter of
                                         Transmittal, as the case may be, or any
                                         other documents required by such Letter
                                         of Transmittal to the Exchange Agent
                                         (or comply with the procedures for
                                         book-entry transfer) prior to the
                                         Expiration Date must tender their
                                         Original Notes according to the
                                         guaranteed delivery procedures set
                                         forth in "The Exchange
                                         Offer -- Guaranteed Delivery
                                         Procedures."
 
UNTENDERED NOTES....................     Following the consummation of the
                                         Exchange Offer, Holders of Original
                                         Notes eligible to participate but who
                                         do not tender their Original Notes will
                                         not have any further exchange rights,
                                         and such Original Notes will continue
                                         to be subject to certain restrictions
                                         on transfer. Accordingly, the liquidity
                                         of the market for such Original Notes
                                         could be adversely affected by the
                                         Exchange Offer.
 
- --------------------------------------------------------------------------------
                                       13
<PAGE>   15
- --------------------------------------------------------------------------------
 
CONSEQUENCES OF FAILURE TO
EXCHANGE............................     The Original Notes that are not
                                         exchanged pursuant to the Exchange
                                         Offer will remain restricted
                                         securities. Accordingly, such Original
                                         Notes may be resold only (i) to the
                                         Company, (ii) pursuant to Rule 144A or
                                         Rule 144 under the Securities Act or
                                         pursuant to some other exemption under
                                         the Securities Act, (iii) outside the
                                         United States in compliance with
                                         Regulation S of the Securities Act, or
                                         (iv) pursuant to an effective
                                         registration statement under the
                                         Securities Act. See "The Exchange
                                         Offer -- Consequences of Failure to
                                         Exchange."
 
SHELF REGISTRATION STATEMENT........     In the event that any changes in law of
                                         the applicable interpretations of the
                                         staff of the Commission do not permit
                                         the Company to effect the Exchange
                                         Offer, or upon the request of a Holder
                                         of Transfer Restricted Securities (as
                                         defined) under certain circumstances or
                                         if the Exchange Offer is not for any
                                         other reason consummated within 210
                                         days of the date on which the Original
                                         Notes were issued, the Company has
                                         agreed pursuant to the Registration
                                         Rights Agreement to register the
                                         Original Notes issued by it on a shelf
                                         registration statement (the "Shelf
                                         Registration Statement") and use its
                                         best efforts to cause it to be declared
                                         effective by the Commission. The
                                         Company has agreed to use its
                                         reasonable best efforts to maintain the
                                         effectiveness of the Shelf Registration
                                         Statement for a period of two years or,
                                         if sooner, until the date on which the
                                         securities covered by the Shelf
                                         Registration Statement have been sold
                                         or cease to be outstanding.
 
WITHDRAWAL RIGHTS...................     Tenders may be withdrawn at any time
                                         prior to 5:00 p.m., New York City time,
                                         on the Expiration Date. See "The
                                         Exchange Offer -- Withdrawal of
                                         Tenders."
 
ACCEPTANCE OF ORIGINAL NOTES AND
  DELIVERY OF EXCHANGE NOTES........     Subject to certain conditions, the
                                         Company will accept for exchange any
                                         and all Original Notes which are
                                         properly tendered in the Exchange Offer
                                         prior to 5:00 p.m., New York City time,
                                         on the Expiration Date. The Exchange
                                         Notes issued pursuant to the Exchange
                                         Offer will be delivered promptly
                                         following the Expiration Date. See "The
                                         Exchange Offer -- Terms of the Exchange
                                         Offer."
 
FEDERAL TAX CONSIDERATION...........     The exchange pursuant to the Exchange
                                         Offer will generally not be a taxable
                                         event for federal income tax purposes.
                                         See "Certain Federal Tax
                                         Considerations."
 
USE OF PROCEEDS.....................     There will be no cash proceeds to the
                                         Company from the exchange pursuant to
                                         the Exchange Offer.
 
EXCHANGE AGENT......................     State Street Bank and Trust Company.
 
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                                       14
<PAGE>   16
- --------------------------------------------------------------------------------
 
                   SUMMARY DESCRIPTION OF THE EXCHANGE NOTES
 
GENERAL.............................     The form and terms of the Exchange
                                         Notes are substantially the same as the
                                         form and terms of the Original Notes
                                         except that (i) the Exchange Notes bear
                                         a Series B designation, (ii) the
                                         Exchange Notes have been registered
                                         under the Securities Act and,
                                         therefore, will generally not bear
                                         legends restricting the transfer
                                         thereof (other than those that might be
                                         imposed by state securities laws) and
                                         (iii) the Exchange Notes will not
                                         provide for the payment of Liquidated
                                         Damages (except in certain limited
                                         circumstances set forth in the
                                         Registration Rights Agreement). See
                                         "The Exchange Offer -- Registration
                                         Rights; Liquidated Damages." The
                                         Exchange Notes will evidence the same
                                         debt as the Original Notes and will be
                                         entitled to the benefits of the
                                         Indenture. As used herein, the term
                                         "Notes" refers collectively to the
                                         Exchange Notes and the Original Notes.
 
SECURITIES OFFERED..................     $210,000,000 aggregate principal amount
                                         of 8 7/8% Series B Senior Notes due
                                         2008.
 
INTEREST RATE AND PAYMENT DATES.....     Interest on the Exchange Notes will
                                         accrue at the rate of 8 7/8% per annum,
                                         payable semi-annually in arrears on
                                         August 1 and February 1 of each year,
                                         commencing February 1, 1999.
 
MATURITY............................     August 1, 2008.
 
REDEMPTION..........................     The Exchange Notes may be redeemed at
                                         Nortek's option, in whole or in part,
                                         at any time and from time to time, on
                                         and after August 1, 2003, initially at
                                         104.438% of principal amount and
                                         thereafter at prices declining to 100%
                                         from and after August 1, 2006, plus
                                         accrued and unpaid interest and
                                         Liquidated Damages, if any, to the date
                                         of redemption. See "Description of
                                         Notes -- Optional Redemption."
 
USE OF PROCEEDS.....................     Nortek will not receive any proceeds
                                         from the Exchange Offer.
 
CHANGE OF CONTROL...................     Upon a Change of Control (as defined),
                                         holders of the Exchange Notes will have
                                         the right, subject to certain
                                         restrictions and conditions, to require
                                         the Company to purchase all or any part
                                         of their Exchange Notes at 101% of the
                                         principal amount thereof, plus accrued
                                         and unpaid interest and Liquidated
                                         Damages, if any (the "Change of Control
                                         Payment"), to the date of purchase. If
                                         a Change of Control were to occur,
                                         there can be no assurance that the
                                         Company would have sufficient funds to
                                         make the Change of Control Payment with
                                         respect to all Notes tendered by
                                         holders thereof. In addition, the
                                         Company's ability to make such payment
                                         may be limited by the terms of
                                         agreements governing the indebtedness
                                         of the Company and
 
- --------------------------------------------------------------------------------
                                       15
<PAGE>   17
- --------------------------------------------------------------------------------
 
                                         its subsidiaries. See "Description of
                                         Notes -- Change of Control" and
                                         "Description of Other Obligations."
 
RANKING.............................     The Exchange Notes will be senior
                                         unsecured obligation of the Company and
                                         will rank pari passu in right of
                                         payment with all existing and future
                                         senior unsecured indebtedness of the
                                         Company, including Nortek's outstanding
                                         9 1/4% Senior Notes due 2007 (the
                                         "9 1/4% Notes") and Nortek's
                                         outstanding 9 1/8% Senior Notes due
                                         2007 (the "9 1/8% Notes"), and senior
                                         in right of payment to all existing and
                                         future subordinated indebtedness of the
                                         Company, including Nortek's outstanding
                                         9 7/8% Senior Subordinated Notes due
                                         2004 (the "9 7/8% Notes"). The Exchange
                                         Notes will be effectively subordinated
                                         to all existing and future secured
                                         indebtedness of the Company to the
                                         extent of the value of the assets
                                         securing such indebtedness, and to all
                                         existing and future secured and
                                         unsecured indebtedness and other
                                         obligations of the Company's
                                         subsidiaries (except in the case of
                                         unsecured indebtedness and other
                                         obligations to the extent any
                                         Subsidiary Guaranty is then in effect).
                                         Subject to certain restrictions, the
                                         indenture pursuant to which the
                                         Original Notes were issued and the
                                         Exchange Notes will be issued (the
                                         "Indenture") permits the Company and
                                         its subsidiaries to incur additional
                                         indebtedness, including senior
                                         indebtedness which may be secured, and
                                         other liabilities. At October 3, 1998,
                                         after giving pro forma effect to the
                                         acquisition of Napco, the Exchange
                                         Notes would have been effectively
                                         subordinated to approximately $495.2
                                         million of indebtedness for borrowed
                                         money, trade payables and accrued
                                         liabilities of the Company's
                                         subsidiaries. See "Description of
                                         Notes -- General."
 
CERTAIN RESTRICTIVE COVENANTS.......     The Indenture contains certain
                                         covenants that limit the ability of the
                                         Company and its Restricted Subsidiaries
                                         (as defined) to, among other things,
                                         pay dividends, repurchase capital stock
                                         or make certain other Restricted
                                         Payments (as defined), incur additional
                                         Indebtedness (as defined), issue
                                         preferred stock of Restricted
                                         Subsidiaries, make certain Investments
                                         (as defined) and consummate certain
                                         mergers, consolidations or sales of
                                         assets. Upon certain Asset Sales (as
                                         defined), the Company will be required
                                         in certain circumstances to offer to
                                         apply certain proceeds thereof to
                                         purchase the Notes. However, all of
                                         these limitations and prohibitions are
                                         subject to a number of important
                                         qualifications and exceptions. See
                                         "Description of Notes -- Certain
                                         Covenants."
 
                                  RISK FACTORS
 
     Holders of the Notes should consider carefully all of the information
included in this Prospectus and, in particular, should evaluate the specific
factors set forth under "Risk Factors."
 
- --------------------------------------------------------------------------------
                                       16
<PAGE>   18
- --------------------------------------------------------------------------------
 
            SUMMARY UNAUDITED CONSOLIDATED PRO FORMA FINANCIAL DATA
 
     The following table sets forth summary unaudited consolidated pro forma
financial data of the Company which give effect to the Ply Gem and NuTone
acquisitions. The pro forma consolidated financial data should be read in
conjunction with the audited and unaudited Consolidated Financial Statements and
the Notes thereto, the information contained in "Management's Discussion and
Analysis of Financial Condition and Results of Operations" and the information
contained in "Unaudited Pro Forma Condensed Consolidated Financial Data"
included elsewhere herein.
 
     Information entitled "Nortek Historical" is derived from the Consolidated
Financial Statements of Nortek contained elsewhere herein and includes the
results of Ply Gem and NuTone from the date of acquisition of each by Nortek.
Information entitled "NuTone Historical" is derived from the Consolidated
Financial Statements of NuTone contained elsewhere herein and includes the
results of NuTone through July 31, 1998.
 
   
     During 1998, the Company sold several nonstrategic businesses including
Studley, Sagebrush, Goldenberg, Ply Gem Manufacturing, Allied, M&S and MOM. On
October 9, 1998 the Company acquired Napco. The following Summary Unaudited
Consolidated Pro Forma Financial Data and other data does not give pro forma
effect to the dispositions of businesses that have occurred in 1998 or the
acquisition of Napco. See "Recent Developments."
    
 
     The following unaudited pro forma consolidated financial data is presented
for illustrative purposes only and is not necessarily indicative of the results
of operations which would actually have been reported had the above transactions
been in effect during the periods presented or which may be reported in the
future.
   
    
 
   
<TABLE>
<CAPTION>
                                   NINE MONTHS ENDED SEPTEMBER 27, 1997      NINE MONTHS ENDED OCTOBER 3, 1998
                                  --------------------------------------    -----------------------------------
                                   PRO FORMA
                                  NORTEK AND                  PRO FORMA                               PRO FORMA
                                    PLY GEM       NUTONE       COMPANY        NORTEK       NUTONE      COMPANY
                                    (4)(5)      HISTORICAL      (5)(6)      HISTORICAL   HISTORICAL    (5)(6)
                                  -----------   -----------   ----------    ----------   ----------   ---------
                                                 (IN MILLIONS, EXCEPT PER SHARE DATA AND RATIOS)
<S>                               <C>           <C>           <C>           <C>          <C>          <C>
CONSOLIDATED STATEMENT OF
  OPERATIONS DATA:
Net sales.......................   $1,234.3       $145.0       $1,379.3      $1,300.3      $110.7     $1,411.0
Gross profit....................      288.6         55.0          339.1         331.4        40.8        368.6
Operating earnings..............       59.9         17.2           75.2          97.1        12.3        106.3
Interest expense, net...........      (53.4)        (8.9)         (67.9)        (54.6)       (7.1)       (66.3)
Earnings from continuing
  operations....................        2.6          4.9            0.6          23.1         3.2         19.6
Earnings per diluted share from
  continuing operations.........   $    .22                    $    .05      $   2.13                 $   1.65
OTHER CONSOLIDATED DATA:
Capital expenditures............   $   34.6       $  3.5       $   38.1      $   24.2      $  2.1     $   26.3
Depreciation and amortization
  including non-cash interest...       32.3          2.7           40.0          33.5         2.0         39.4
EBITDA(1).......................       89.9         19.9          112.4         128.2        14.3        142.8
Ratio of earnings to fixed
  charges(2)....................        1.1                         1.1           1.6x                     1.5x
Ratio of EBITDA to interest
  expense, net..................        1.7x                        1.7x          2.3x                     2.2x
</TABLE>
    
 
- --------------------------------------------------------------------------------
                                       17
<PAGE>   19
- --------------------------------------------------------------------------------
 
   
<TABLE>
<CAPTION>
                                                                    YEAR ENDED DECEMBER 31, 1997
                                                              ----------------------------------------
                                                                 PRO FORMA
                                                                  NORTEK                     PRO FORMA
                                                                AND PLY GEM       NUTONE      COMPANY
                                                                  (4)(5)        HISTORICAL    (5)(6)
                                                              ---------------   ----------   ---------
                                                              (IN MILLIONS, EXCEPT PER SHARE DATA AND
                                                                              RATIOS)
<S>                                                           <C>               <C>          <C>
CONSOLIDATED STATEMENT OF OPERATIONS DATA:
Net sales...................................................     $1,650.1         $199.1     $1,849.2
Gross profit................................................        391.2           76.2        461.4
Operating earnings..........................................         87.3           24.8        107.9
Interest expense, net.......................................        (70.3)         (11.8)       (89.6)
Earnings from continuing operations.........................          8.2            7.9          5.9
Earnings per diluted share from continuing operations.......     $    .68                    $    .49
OTHER CONSOLIDATED DATA:
Capital expenditures........................................     $   44.1         $  3.7     $   47.8
Depreciation and amortization including non-cash interest...         42.1            3.4         52.2
EBITDA(1)...................................................        126.5           28.2        156.5
Ratio of earnings to fixed charges(2).......................          1.2x                        1.2x
</TABLE>
    
 
- ---------------
(1) "EBITDA" is operating earnings from continuing operations plus depreciation
    and amortization (other than amortization of deferred debt expense and debt
    discount). EBITDA differs from Consolidated Cash Flow as defined in the
    Indenture. See "Description of Notes -- Certain Definitions." EBITDA should
    not be considered as an alternative to net earnings as a measure of
    operating results or to cash flows as a measure of liquidity. EBITDA
    principally differs from net increase (decrease) in unrestricted cash and
    cash equivalents shown on the Consolidated Statement of Cash Flows of the
    Company, prepared in accordance with generally accepted accounting
    principles, in that EBITDA does not reflect capital expenditures,
    borrowings, principal and interest payments under debt and capital lease
    obligations, income tax payments and cash flows from other operating,
    investing and financing activities. The Company believes that EBITDA may be
    useful to investors in evaluating the Company's ability to service debt and
    to finance growth including acquisitions, capital expenditures and working
    capital. The Company believes that during periods of increasing EBITDA the
    Company may be able to finance its growth including acquisitions, capital
    expenditures and working capital through increased borrowings and the sale
    of equity. In periods of declining EBITDA, the Company may be required to
    limit or defer growth, including acquisitions and capital expenditures, and
    may be required to adopt measures to reduce the level of its expenses and
    working capital. EBITDA as calculated by the Company may differ from EBITDA
    as calculated by other companies.
 
   
(2) For purposes of calculating this ratio, "earnings" consist of earnings from
    continuing operations before provision for income taxes and fixed charges.
    "Fixed charges" consist of interest expense and the estimated interest
    portion of rental payments on operating leases.
    
 
(3) For purposes of calculating this ratio, "net debt" consists of total debt
    less total cash, cash equivalents and marketable securities.
 
   
(4) Gives effect to the Ply Gem Acquisition; estimated cost reductions directly
    attributable to the Ply Gem Acquisition of approximately $4.0 million for
    the year ended December 31, 1997 and the nine months ended September 27,
    1997; issuance of the 9 1/4% Notes; issuance of the 9 1/8% Notes; and the
    Common Stock Offering, in each case as if such events had occurred on
    January 1, 1997. Pro forma results do not give effect to estimated
    additional cost savings and reductions related to the Ply Gem Acquisition of
    approximately $14.0 million for the year ended December 31, 1997 and the
    nine months ended September 27, 1997 (the Ply Gem cost savings and
    reductions are estimates and actual savings achieved could differ
    materially). The Ply Gem Acquisition occurred on August 26, 1997. See
    "Unaudited Pro Forma (for Ply Gem) Condensed Consolidated Statement of
    Operations."
    
 
- --------------------------------------------------------------------------------
                                       18
<PAGE>   20
- --------------------------------------------------------------------------------
 
(5) The Acquisition and the Ply Gem Acquisition are accounted for under the
    purchase method of accounting. The summary unaudited pro forma consolidated
    financial data have been prepared utilizing preliminary purchase price
    allocations. The preliminary purchase price allocations are subject to
    refinement until all pertinent information regarding the Acquisition and the
    Ply Gem Acquisition is obtained and accordingly the amounts presented herein
    are subject to change.
 
   
(6) Gives effect to the adjustments discussed in Note 4 above, as applicable,
    the Offering and the Acquisition, in each case as if such events had
    occurred on January 1, 1997 and reflects cost reductions directly
    attributable to the Acquisition of approximately $1.7 million, $0.4 million
    and $2.6 million for the year ended December 31, 1997 and the nine months
    ended October 3, 1998 and September 27, 1997, respectively. Does not give
    effect to approximately $15.0 million in annualized estimated additional
    cost savings and reductions, from year ended December 31, 1997 levels,
    Nortek expects to achieve, within 12 to 18 months as a result of actions to
    be taken subsequent to the Acquisition or estimated additional cost savings
    and reductions related to the Ply Gem Acquisition of approximately $14.0
    million for the year ended December 31, 1997 and the nine months ended
    September 27, 1997. These cost savings and reductions are estimates and
    actual savings achieved could differ materially. No adjustment is required
    for the nine months ended October 3, 1998 for the estimated cost reductions
    directly attributable to the Ply Gem Acquisition as discussed in Note 4.
    
 
- --------------------------------------------------------------------------------
                                       19
<PAGE>   21
- --------------------------------------------------------------------------------
 
                                  NORTEK, INC.
                    SUMMARY HISTORICAL FINANCIAL INFORMATION
 
     The following summary consolidated historical financial data for each of
the five years in the period ended December 31, 1997 have been derived from the
consolidated financial statements of Nortek which were audited by Arthur
Andersen LLP, independent public accountants. The following summary consolidated
historical financial data at October 3, 1998 and for the nine months ended
September 27, 1997 and October 3, 1998 have been derived from the unaudited
condensed consolidated financial statements of Nortek, which reflect in the
opinion of Nortek all adjustments of a normal recurring nature necessary for a
fair statement of the interim periods presented. The following summary financial
data should be read in conjunction with the Company's audited and unaudited
Consolidated Financial Statements and Notes thereto, the information contained
in "Management's Discussion and Analysis of Financial Condition and Results of
Operations," and the information contained in "Unaudited Pro Forma Condensed
Consolidated Financial Data" included elsewhere herein.
 
<TABLE>
<CAPTION>
                                                                                                 NINE MONTHS ENDED
                                                       YEAR ENDED DECEMBER 31,               --------------------------
                                            ----------------------------------------------   SEPTEMBER 27,   OCTOBER 3,
                                            1993(6)   1994(6)    1995     1996      1997         1997           1998
                                            -------   -------   ------   ------   --------   -------------   ----------
                                                          (IN MILLIONS EXCEPT PER SHARE DATA AND RATIOS)
<S>                                         <C>       <C>       <C>      <C>      <C>        <C>             <C>
STATEMENT OF OPERATIONS DATA(1)(2):
Net sales.................................  $627.5    $616.0    $656.8   $841.6   $1,134.1      $ 718.4       $1,300.3
Operating earnings........................    31.7      44.4      43.0     61.0       83.0         55.6           97.1
Interest expense, net.....................    19.4      18.5      14.9     22.4       40.3         23.4           54.6
Earnings (loss) from continuing
  operations..............................   (10.2)     15.4      17.5     23.7       26.4         20.8           23.1
Earnings (loss) per share from continuing
  operations(2)(3):
  Basic...................................  $(0.81)   $ 1.23    $ 1.41   $ 2.26   $   2.75      $  2.16       $   2.17
  Diluted.................................   (0.81)     1.21      1.39     2.23       2.68         2.11           2.13
Weighted average number of shares (in
  thousands):
  Basic...................................  12,532    12,543    12,445   10,485      9,605        9,632         10,660
  Diluted.................................  13,335    13,100    12,569   10,641      9,855        9,878         10,858
OTHER DATA(2):
Capital expenditures......................  $  8.7    $ 14.4    $ 15.7   $ 19.8   $   22.5      $  13.0       $   24.2
Depreciation and amortization including
  non-cash interest.......................    18.0      15.5      16.2     21.0       28.4         18.5           33.5
EBITDA(4).................................    49.2      58.6      58.1     80.8      109.7         73.1          128.2
Ratio of earnings to fixed charges(5).....      --       1.9x      2.1x     2.3x       1.8x         2.0x           1.6x
CASH FLOW STATEMENT DATA:
Net cash provided by operating
  activities..............................    12.4      26.2      33.3     47.4       85.1         35.2           16.7
Net cash provided by (used in) investing
  activities..............................    20.2     (56.6)    (35.1)    (5.2)    (423.4)      (458.8)        (269.2)
Net cash provided by (used in) financing
  activities..............................      .5       8.6       4.1    (38.3)     423.1        431.6          225.9
</TABLE>
 
<TABLE>
<CAPTION>
                                                              OCTOBER 3, 1998
                                                              ---------------
                                                               (IN MILLIONS)
<S>                                                           <C>
BALANCE SHEET DATA:
Cash, cash equivalents and marketable securities(7).........     $  207.8
Working capital.............................................        382.3
Total assets................................................      1,652.4
Total debt..................................................      1,026.9
Stockholders' investment....................................        212.2
</TABLE>
 
- ---------------
(1) Acquisitions have been accounted for under the purchase accounting method
    and dispositions have been accounted for as described in Note 2 to the
    Consolidated Financial Statements of Nortek included elsewhere herein.
 
(2) In the fourth quarter of 1997, the Company adopted a plan to discontinue its
    plumbing products business. Accordingly, the results of the plumbing
    products business have been excluded from earnings from continuing
    operations and classified separately as discontinued operations for all
    periods presented. See Note 9 of the Notes to Consolidated Financial
    Statements of the Company included elsewhere herein.
 
- --------------------------------------------------------------------------------
                                       20
<PAGE>   22
- --------------------------------------------------------------------------------
 
(3) In 1997, the Company adopted the provisions of SFAS No. 128, Earnings Per
    Share. This statement, issued by the FASB in February 1997, establishes
    standards for computing and presenting earnings per share ("EPS") and
    applies to entities with publicly held common stock. This statement replaces
    the presentation of primary EPS with a presentation of basic EPS and
    replaces the presentation of fully-diluted EPS with diluted EPS. All periods
    presented have been restated to conform to SFAS No. 128.
 
(4) "EBITDA" is operating earnings from continuing operations plus depreciation
    and amortization (other than amortization of deferred debt expense and debt
    discount). EBITDA differs from Consolidated Cash Flow as defined in the
    Indenture. See "Description of Notes -- Certain Definitions." EBITDA should
    not be considered as an alternative to net earnings as a measure of the
    Company's operating results or to cash flows as a measure of liquidity.
    EBITDA principally differs from net increase (decrease) in unrestricted cash
    and cash equivalents shown on the Consolidated Statement of Cash Flows of
    the Company, prepared in accordance with generally accepted accounting
    principles, in that EBITDA does not reflect capital expenditures,
    borrowings, principal and interest payments under debt and capital lease
    obligations, income tax payments and cash flows from operating, investing
    and financing activities. The Company believes that EBITDA may be useful to
    investors in evaluating the Company's ability to service debt and to finance
    growth including acquisitions, capital expenditures and working capital. The
    Company believes that during periods of increasing EBITDA the Company may be
    able to finance its growth including acquisitions, capital expenditures and
    working capital through increased borrowings and the sale of equity. In
    periods of declining EBITDA, the Company may be required to limit or defer
    growth, including acquisitions and capital expenditures, and may be required
    to adopt measures to reduce the level of its expenses and working capital.
    EBITDA as calculated by the Company may differ from EBITDA as calculated by
    other companies.
 
(5) For purposes of calculating this ratio, "earnings" consist of earnings from
    continuing operations before provision for income taxes and fixed charges.
    "Fixed charges" consist of interest expense and the estimated interest
    portion of rental payments on operating leases. Such earnings were
    insufficient to cover fixed charges by approximately $8.0 million for the
    year ended December 31, 1993.
 
(6) In the third quarter of 1993, the Company provided a pre-tax valuation
    reserve of approximately $20.3 million to reduce the Company's net
    investment in Dixieline Products, Inc. ("Dixieline") to estimated net
    realizable value. On March 31, 1994, the Company sold all of the capital
    stock of Dixieline for approximately $18.8 million in cash and $6.0 million
    in preferred stock of the purchaser. No additional loss in 1994 was incurred
    in connection with the sale. In January 1995, the Company paid approximately
    $1.8 million as a final purchase price adjustment related to the sale in
    1992 of its wholly owned subsidiary Bend Millwork Systems, Inc. ("Bend") and
    recorded a charge to pre-tax earnings in the fourth quarter of 1994.
 
(7) Includes restricted cash, investments and marketable securities in the
    amount of approximately $6.4 million as of October 3, 1998.
 
- --------------------------------------------------------------------------------
                                       21
<PAGE>   23
 
                                  RISK FACTORS
 
     Holders of the Notes should carefully review and consider, among other
things, the factors set forth below, as well as the other information included
in this Prospectus, before making a decision with respect to the Exchange Offer.
 
SUBSTANTIAL LEVERAGE
 
     The Company is highly leveraged and expects to continue to be highly
leveraged for the foreseeable future. At October 3, 1998, on a pro forma basis,
after giving effect to the acquisition of Napco, the Company had consolidated
debt of approximately $1,037.1 million and a debt-to-equity ratio of 4.9 to 1.0.
The Company has evaluated, and expects to continue to evaluate, possible
acquisition transactions and the possible dispositions of certain of its
businesses on an ongoing basis, and at any given time may be engaged in
discussions or negotiations with respect to possible acquisitions or
dispositions. To the extent that the Company pursues any acquisitions, such
acquisitions may be financed through the sale of additional equity or debt
securities. To the extent that such acquisitions are financed through the sale
of additional debt securities, the Company's leverage may increase, which could
have a negative impact on existing debt holders. See "Capitalization"
"Management's Discussion and Analysis of Financial Condition and Results of
Operations -- Liquidity and Capital Resources" and "Description of Other
Obligations."
 
     The degree to which the Company is leveraged could have important
consequences to holders of the Notes, including the following: (i) the Company's
ability to obtain additional financing in the future for refinancing
indebtedness, acquisitions, working capital, capital expenditures or other
purposes may be impaired, (ii) funds available to the Company for its operations
and general corporate purposes or for capital expenditures will be reduced as a
result of the dedication of a substantial portion of the Company's consolidated
cash flow from operations to the payment of the principal and interest on its
indebtedness, (iii) the Company may be more highly leveraged than certain of its
competitors, which may place it at a competitive disadvantage, (iv) the
agreements governing the Company's and its subsidiaries' long-term indebtedness
(including indebtedness under the 9 7/8% Notes, the 9 1/4% Notes, the 9 1/8%
Notes, the Ply Gem Credit Facility (as defined) and the Notes) and bank loans
contain certain restrictive financial and operating covenants, including, in the
case of certain indebtedness of subsidiaries, certain covenants that restrict
the ability of the Company's subsidiaries to pay dividends or make other
distributions to the Company (see "Description of Other Obligations"), (v) an
event of default (not cured or waived) under financial and operating covenants
contained in the Company's or its subsidiaries' debt instruments, including the
Indenture, could occur and have a material adverse effect on the Company, (vi)
certain of the borrowings under debt agreements of the Company's subsidiaries
have floating rates of interest, which causes the Company and its subsidiaries
to be vulnerable to increases in interest rates and (vii) the Company's
substantial degree of leverage could make it more vulnerable to a downturn in
general economic conditions.
 
     The terms of the Indenture allow for the incurrence of additional
Indebtedness (as defined). Except as set forth below, the incurrence of
additional Indebtedness is limited by certain conditions, including compliance
with a Consolidated Cash Flow Coverage Ratio (as defined) of 2.0 to 1.0, pro
forma for, among other things, the incurrence of additional Indebtedness. As of
October 3, 1998, the Company is significantly limited in its ability to incur
additional Indebtedness based on compliance with the Consolidated Cash Flow
Coverage Ratio. The Company and its Restricted Subsidiaries (as defined) may
incur specified levels of additional Indebtedness without regard to compliance
with the Consolidated Cash Flow Coverage Ratio or any other financial ratio or
covenant in the Indenture. The Indenture places no restriction on the incurrence
of Indebtedness by any of the Company's Unrestricted Subsidiaries (as defined).
As of the date of this Prospectus, the Company does not have any Unrestricted
Subsidiaries. See "Description of Notes." In the event the Company or its
subsidiaries were to incur additional Indebtedness, whether for acquisitions,
investment in its business or other general corporate purposes, the Company's
leverage could increase, which in turn could make it more susceptible to the
factors described above.
 
     The terms of the Indenture permit the Company to make certain Restricted
Payments (as defined), including dividends, which could affect the Company's
leverage. The Indenture is the Company's most
 
                                       22
<PAGE>   24
 
restrictive indenture with respect to Restricted Payments, and at November 6,
1998 limits the Company's ability to make Restricted Payments to approximately
$61.1 million. See "Description of the Notes -- Certain Covenants."
 
     The ability of the Company and its subsidiaries to make principal and
interest payments under long-term indebtedness (including the Notes) and bank
loans will be dependent upon their future performance, which is subject to
financial, economic and other factors affecting the Company and its
subsidiaries, some of which are beyond their control. There can be no assurance
that the current level of operating results of the Company and its subsidiaries
will continue or improve. The Company believes that it will need to access the
capital markets in the future in order to provide the funds necessary to repay a
significant portion of its indebtedness. There can be no assurance that any such
refinancing will be possible or that any additional financing can be obtained,
particularly in view of the Company's anticipated high levels of debt and the
debt incurrence restrictions under its existing debt agreements, including the
Indenture. If no such refinancing or additional financing were available, the
Company and/or its subsidiaries could default on their respective debt
obligations. In such case, virtually all other debt of the Company and its
subsidiaries, including payments to be made under the Notes, could become
immediately due and payable. The Company expects to meet its cash flow
requirements through fiscal 1999 from cash generated from operations, existing
cash, cash equivalents and marketable securities, the sale of assets and
possible financings, which may include securitization of accounts receivables
and mortgage or capital lease financings.
 
SECURED INDEBTEDNESS
 
     The Indenture permits the Company to incur certain indebtedness secured by
a lien on assets of the Company (including indebtedness which may be incurred
under the Company Credit Facility (as defined) and the Ply Gem Credit Facility
(as defined)). The Notes are unsecured and will be effectively subordinated to
all existing and future secured indebtedness of the Company to the extent of the
value of the assets securing such indebtedness. Accordingly, if an event of
default occurs under any agreement or instrument governing secured indebtedness
of the Company, the lenders thereunder will have a prior right to the assets of
the Company securing such indebtedness and may foreclose upon such collateral to
the exclusion of the holders of the Notes. In such event, such assets would
first be used to repay in full outstanding amounts under indebtedness secured
thereby, resulting in all or a portion of the Company's assets being unavailable
to satisfy the claims of the holders of Notes and holders of other unsecured
indebtedness. As of October 3, 1998, after giving pro forma effect to the
acquisition of Napco, the Company had outstanding, exclusively through its
subsidiaries, on a pro forma basis $135.0 million of secured indebtedness. See
"Description of Notes -- Certain Covenants" and "Description of Other
Obligations -- Ply Gem Credit Facility."
 
STRUCTURAL SUBORDINATION
 
     The Notes will be obligations of the Company exclusively. Because the
operations of the Company are conducted entirely through subsidiaries, the
Company's cash flow and its ability to service debt, including the Notes, are
dependent upon the cash flow of its subsidiaries and the payment of funds by
those subsidiaries in the forms of loans, dividends or otherwise. The
subsidiaries, however, are legally distinct from the Company and have no
obligation, contingent or otherwise (except to the extent described below with
respect to the requirement to provide guaranties in certain circumstances), to
pay amounts due pursuant to the Notes or to make any funds available for such
payments.
 
     Certain agreements governing the Company's subsidiaries restrict the
ability of the subsidiaries to pay dividends or make other distributions to the
Company. See "Description of Other Obligations."
 
     In addition, while substantially all of the Company's subsidiaries are
currently wholly owned directly or indirectly by the Company, the ability of the
Company to cause any less than wholly owned subsidiary to pay dividends or make
other distributions to the Company may be limited by reason of contractual
restrictions or the need to consider the interests of the other owners of such
subsidiary. For example, a pro rata amount of any dividend distribution would in
most cases be required to be paid to the other owners of such subsidiary (and
thereby be subject to, and potentially prohibited by, the Limitations on
Restricted Payments covenant of the Indenture and similar covenants in other
agreements or instruments applicable to the Company, including
 
                                       23
<PAGE>   25
 
without limitation the indentures governing the 9 7/8% Notes, the 9 1/4% Notes
and the 9 1/8% Notes). In addition, the terms of any loan from any such less
than wholly owned subsidiary to the Company may only be able to be made, if at
all, on terms less favorable to the Company than in the case of a loan from a
wholly owned subsidiary.
 
     Except to the extent that the Company may itself be a trade creditor with
recognized claims against its subsidiaries, claims of creditors of such
subsidiaries, including trade creditors, will have effective priority with
respect to the assets and earnings of such subsidiaries over the claims of
creditors of the Company, including holders of the Notes. At October 3, 1998,
after pro forma giving effect to the acquisition of Napco, the Notes would have
been effectively subordinated to approximately $495.2 million of indebtedness
for borrowed money, trade payables and accrued liabilities of the Company's
subsidiaries. See "Description of Notes -- General."
 
     The Indenture provides that in the event any of the Company's subsidiaries
guarantees or otherwise becomes liable for the payment of any Indebtedness of
the Company (other than Indebtedness under the Company Credit Facility or the
Ply Gem Credit Facility) such subsidiary shall also guarantee the payment of the
Notes. This provision of the Indenture ceases to have effect in certain
circumstances. In the event any subsidiary provides such a guaranty, the
guaranty may, under certain circumstances, be subject to avoidance or
subordination under fraudulent conveyance laws or the preference provisions of
federal or state bankruptcy law. See "Description of Notes -- Certain
Covenants -- Limitation on Guaranties by Subsidiaries."
 
REPURCHASE OF NOTES UPON CHANGE OF CONTROL
 
     Upon the occurrence of a Change of Control, the Company will be required to
make an offer to repurchase the Notes at a price equal to 101% of the principal
amount thereof, plus accrued and unpaid interest, and Liquidated Damages, if
any, to the date of repurchase. Certain events involving a Change of Control
could result in acceleration of, or similar repurchase obligations with respect
to, indebtedness outstanding under the Company Credit Facility, the Ply Gem
Credit Facility, the 9 7/8% Notes, the 9 1/4% Notes, the 9 1/8% Notes or other
indebtedness of the Company or its subsidiaries that may be incurred in the
future. There can be no assurance that the Company will have sufficient
resources to repurchase the Notes in the event it becomes obligated to do so,
particularly in the event of acceleration of, or the need to comply with
repurchase obligations with respect to, other indebtedness. The failure to
repurchase all of the tendered Notes in the event of a Change of Control
constitutes an event of default under the Indenture which may result in the
acceleration of the maturity of the Notes. The Change of Control repurchase
provisions may be deemed to have anti-takeover effects and may delay, defer or
prevent a merger, tender offer or other takeover attempt. See "Description of
Notes -- Change of Control", "-- Certain Covenants" and "-- Events of Default
and Remedies."
 
INTEGRATION OF THE BUSINESS OF NUTONE
 
     A significant element of the Company's business strategy is to pursue
strategic acquisitions that either expand or complement the Company's products
or markets. The Company's business plan assumes that significant synergies and
cost savings can be realized in connection with the Acquisition. If significant
difficulty is encountered during the integration process, if NuTone is not
rapidly integrated or if such synergies and cost savings are not realized, the
results of operations and financial condition of the Company likely will be
adversely affected. There can be no assurance that the Company will be able to
successfully manage and integrate NuTone following the Acquisition.
 
FTC ORDER
 
   
     The FTC Order required Nortek to divest, at no minimum price, prior to
December 31, 1998, all of the M&S Assets. On December 30, 1998, Nortek sold M&S
after obtaining the required FTC approval. At any time after the consummation of
the Acquisition, the FTC, the Department of Justice (DOJ) or any state could
take such action under the antitrust laws as it deems necessary or desirable to
the public interest. While the Company does not expect the FTC, the DOJ or any
state to take any action to challenge the Acquisition
    
 
                                       24
<PAGE>   26
 
on antitrust grounds, there is no assurance that such a challenge will not be
made or, if made and successful, would not have a material adverse effect on the
Company.
 
LABOR RELATIONS
 
   
     As of December 31, 1998, approximately 29% of Nortek's workforce is subject
to various collective bargaining agreements. Collective bargaining agreements
covering approximately 22% of Nortek's workforce expire in 1999. There can be no
assurance as to the results of future negotiations of these or other collective
bargaining agreements, whether these or any other collective bargaining
agreements will be negotiated without production interruptions including labor
stoppages or the possible impact of these or any other collective bargaining
agreements, or the negotiations thereof, on the Company's financial condition
and results of operations.
    
 
FRAUDULENT CONVEYANCE CONSIDERATIONS
 
     The incurrence by the Company of indebtedness such as the Notes to finance
the Acquisition and related transactions may be subject to review under federal
bankruptcy law or relevant state fraudulent conveyance laws if a bankruptcy case
or lawsuit is commenced by or on behalf of unpaid creditors of the Company.
Under these laws, if a court were to find that, after giving effect to the sale
of the Notes and the application of the net proceeds therefrom, either (a) the
Company incurred such indebtedness with the intent of hindering, delaying or
defrauding creditors or (b) the Company received less than reasonably equivalent
value or consideration for incurring such indebtedness and (i) was insolvent or
was rendered insolvent by reason of such transactions, (ii) was engaged in a
business or transaction for which the assets remaining with the Company
constituted unreasonably small capital, or (iii) intended to incur, or believed
that it would incur, debts beyond its ability to pay as they matured, such court
might subordinate such indebtedness to presently existing and future
indebtedness of the Company or void the issuance of such indebtedness and direct
the repayment of any amounts paid thereunder to the creditors of the Company, as
the case may be, or take other action detrimental to the holders of such
indebtedness.
 
     The measure of insolvency for purposes of determining whether a transfer is
avoidable as a fraudulent transfer varies depending upon the law of the
jurisdiction that is being applied. Generally, however, a debtor would be
considered insolvent if the sum of all its debts, including contingent
liabilities, were greater than the value of all of its assets at a fair
valuation, or if the present fair saleable value of the debtor's assets were
less than the amount required to repay its probable liability on its debts,
including contingent liabilities, as they become absolute and mature.
 
     The Company believes that it received equivalent value at the time
indebtedness under the Notes was incurred. In addition, after giving effect to
the Offering and the Acquisition, the Company does not: (i) believe that it will
be insolvent or rendered insolvent; (ii) believe that it was engaged in a
business or transaction for which its remaining assets constitute unreasonably
small capital; or (iii) intend to incur, or believe that it will incur, debts
beyond its ability to pay as they mature. These beliefs are based on the
Company's analysis of internal cash flow projections and estimated values of
assets and liabilities of the Company at the time of the Offering. There can be
no assurance, however, that a court passing on these issues would make the same
determination.
 
SENSITIVITY TO ECONOMIC CYCLES; AVAILABILITY AND PRICING OF RAW MATERIALS
 
     A significant percentage of the Company's sales of residential and
commercial building products is attributable to new residential and
nonresidential construction, which are affected by such cyclical factors as
interest rates, inflation, consumer spending habits and employment. This
exposure to cyclicality in the new construction market is partially mitigated by
the Company's increasing emphasis on the repair and replacement markets, which
are typically less cyclical. In addition, the Company is dependent upon raw
 
                                       25
<PAGE>   27
 
materials (including, among others, steel, copper, packaging material, plastics,
resins and aluminum) and components purchased from third parties. Accordingly,
the Company's results of operations and financial condition have in the past
been, and may again in the future be, adversely affected by increases in raw
material or component costs or their lack of availability.
 
RISKS ASSOCIATED WITH ACQUISITIONS
 
     The Company has made a number of acquisitions, including six since 1995,
and will continue to review future acquisition opportunities. No assurances can
be given that acquisition candidates will continue to be available on terms and
conditions acceptable to the Company. Acquisitions, including the Acquisition,
involve numerous risks, including among other things, difficulties and expenses
incurred in connection with the acquisition and the subsequent assimilation of
the operations of the acquired companies, adverse consequences of conforming the
acquired company's accounting policies to those of the Company, the difficulty
in operating acquired businesses, the diversion of management's attention from
other business concerns and the potential loss of key employees of acquired
companies. There can be no assurance that any acquisition, including the
Acquisition, will be successfully integrated into the Company's on-going
operations or that estimated cost savings will be achieved. In addition, in the
event that the operations of an acquired business do not meet expectations, the
Company may be required to restructure the acquired business or write-off the
value of some or all of the assets of the acquired business.
 
COMPETITION
 
     Substantially all of the markets in which the Company participates are
highly competitive with respect to product quality, price, design innovations,
distribution, service, warranties, reliability, efficiency and financing terms.
Certain of the Company's competitors have greater financial and marketing
resources and brand awareness than the Company. Competitive factors could
require price reductions or increased spending on product development, marketing
and sales that would adversely affect the Company's operating results.
 
LACK OF PUBLIC MARKET; RESTRICTIONS ON TRANSFER
 
     There is no existing public market for the Original Notes or the Exchange
Notes and the Company does not intend to list the Exchange Notes on any national
securities exchange or seek the admission thereof to trading in the National
Association of Securities Dealers Automated Quotation System. The Initial
Purchasers have advised the Company that they currently intend to make a market
in the Notes but are not obligated to do so and may discontinue such market
making at any time without notice. In addition, such market making activity will
be subject to the limits imposed by the Securities Act and the Exchange Act and
may be limited during the Exchange Offer and the pendency of a Shelf
Registration Statement. Accordingly, no assurance can be given that an active
market will develop for any of the Exchange Notes or as to the liquidity of the
trading market for any of the Exchange Notes. If a trading market does not
develop or is not maintained, Holders of the Exchange Notes may experience
difficulty in reselling such Exchange Notes or may be unable to sell them at
all. If a market for the Exchange Notes develops, any such market may be
discontinued at any time. If a trading market develops for the Exchange Notes,
future trading prices of such Exchange Notes will depend on many factors,
including, among other things, prevailing interest rates, the Company's results
of operations and the market for similar securities. Depending on prevailing
interest rates, the market for similar securities and other factors, including
the financial condition of the Company, the Exchange Notes may trade at a
discount from their principal amount.
 
EFFECTS OF YEAR 2000 ISSUE
 
     The Year 2000 ("Y2K") issue refers to and arises from deficient computer
programs and related products, such as embedded chips, which do not properly
recognize or process a year that begins with "20" instead of "19." If not
corrected, many business and other processes could fail or create erroneous
results. The extent of the potential impact of the Y2K issue is not yet known,
and if not timely corrected, it could affect the global economy. Although the
Company believes that all modifications to information technology ("IT") and
non-IT systems material to the Company's business will be Y2K compliant on or
before December 31, 1999, it
 
                                       26
<PAGE>   28
 
cannot predict the outcome or the success of its Y2K initiative, or that third
party systems are or will be Y2K compliant, or that the costs required to
address the Y2K issue, or that the impact of a failure to achieve substantial
Y2K compliance, will not have a material adverse effect on the company's
business, financial condition or results of operations. See "Management's
Discussion and Analysis of Financial Condition and Results of Operations."
                            ------------------------
 
     This Prospectus includes "forward-looking statements" within the meaning of
Section 27A of the Securities Act and Section 21E of the Exchange Act. All
statements other than statements of historical facts, including without
limitation, the statements made under "Summary", "Management's Discussion and
Analysis of Financial Condition and Results of Operations" and "Business"
constitute forward-looking statements. Such forward-looking statements are
subject to certain risks and uncertainties, over which the Company has no
control, which could cause actual results to differ materially from those
projected. Cautionary statements describing these risks and uncertainties
include those disclosed under the caption "Risk Factors" and elsewhere in this
Prospectus. All subsequent written and oral forward-looking statements
attributable to the Company or persons acting on its behalf are expressly
qualified in their entirety by such cautionary statements. Readers are cautioned
not to place undue reliance on forward-looking statements, including statements
made in this Prospectus, which speak only as of the date made (including the
date of any incorporated document in the case of any forward-looking statement
contained therein), and the Company undertakes no obligation to republish
revised forward-looking statements to reflect events or circumstances after the
date originally made or to reflect the occurrence of unanticipated events.
Readers are also urged to carefully review and consider the various disclosures
made by the Company in the Company's periodic reports filed with the Commission.
 
                                       27
<PAGE>   29
 
                                THE ACQUISITION
 
     On July 31, 1998, the Company, through a wholly-owned subsidiary, purchased
all of the issued and outstanding capital stock of NuTone, a wholly-owned
subsidiary of Williams for an aggregate purchase price of approximately $242.5
million. In connection with the acquisition, the Company assumed NuTone's
operating liabilities (other than intercompany borrowings), including certain
liabilities of NuTone concerning post-retirement and other benefit obligations.
The purchase price was funded through the use of the net proceeds from the sale
of $210.0 million principal amount of Original Notes at a slight discount, which
occurred on July 31, 1998, together with approximately $44.8 million of the cash
proceeds received from the Common Stock Offering.
 
   
     Consummation of the Acquisition was subject to a FTC Order under the terms
of which the Company was required to divest, at no minimum price, prior to
December 31, 1998, all of the assets, properties, business and goodwill of its
M&S subsidiary. On December 30, 1998, the Company sold M&S and another Nortek
subsidiary -- MOM -- after obtaining the required FTC approval.
    
 
     The sources and uses of funds used to complete the Acquisition and the
offering of the Original Notes were as follows:
 
<TABLE>
<CAPTION>
                                                              IN MILLIONS
                                                              -----------
<S>                                                           <C>
Sources of funds:
     A portion of the cash proceeds from the Common Stock
      Offering..............................................    $ 44.8
     Gross proceeds from the offering of the Original
      Notes.................................................     209.2
                                                                ------
          Total sources of funds............................    $254.0
                                                                ======
  Uses of funds:
     Payment for shares of NuTone common stock..............    $242.5
     Fees, expenses and other costs related to the
      Acquisition and the offering of the Original Notes....      11.5
                                                                ------
          Total use of funds................................    $254.0
                                                                ======
</TABLE>
 
     As of July 31, 1998, NuTone had letters of credit and a Canadian credit
line supporting aggregate obligations of approximately $3.2 million. In
connection with the Acquisition, Nortek cancelled the Canadian credit line and
entered into a $10,000,000 standby and trade letter of credit facility of which
a portion is being used to back up aggregate obligations of NuTone of
approximately $1.8 million at October 3, 1998. See "Description of Other
Obligations" for a discussion of the standby and trade letter of credit
facility's terms and conditions.
 
                                       28
<PAGE>   30
 
                              RECENT DEVELOPMENTS
 
Common Stock Offering
 
     During the second quarter of 1998, the Company completed the Common Stock
Offering, receiving net proceeds of approximately $64.3 million, of which the
Company used approximately $44.8 million to fund the Acquisition and the balance
was used for general corporate purposes.
 
Dispositions of Businesses
 
     Effective July 10, 1998, the Company sold URC as well as a product line
included in the Residential Building Products Group to Mr. Reed Beidler, an
affiliate of Crane Plumbing, for approximately $33.7 million. URC, which
operated the Company's plumbing products business, had net sales of
approximately $104.5 million in 1997 and was accounted for as a discontinued
operation in the fourth quarter of 1997. The proceeds from the sale of URC were
used for general corporate purposes.
 
     During 1998, the Company made several dispositions of nonstrategic assets
of Ply Gem. On May 8, 1998, the Company sold Studley. Studley had net sales and
an operating loss of approximately $22.0 million and $6.1 million for the year
ended December 31, 1997, respectively, and net sales and an operating loss of
approximately $7.3 million and $1.6 million, respectively, for the period
January 1, 1998 to May 8, 1998 and was treated as an operation held for sale
since the Ply Gem Acquisition. Accordingly Studley's operating results are not
included in the Company's consolidated financial results. On May 22, 1998, the
Company consummated the sale of Sagebrush for approximately $9.1 million in
cash. Sagebrush had net sales, operating earnings (and earnings from continuing
operations before provision for income taxes) and EBITDA of approximately $47.6
million, $0.4 million and $0.7 million, respectively, for the year ended
December 31, 1997 and net sales, operating earnings (and earnings from
continuing operations before provision for income taxes) and EBITDA of
approximately $19.0 million, $0.2 million and $0.3 million, respectively, for
the five months ended May 22, 1998. On July 2, 1998, the Company completed the
sale of Goldenberg for approximately $11.0 million, including approximately $2.1
million in notes. Goldenberg had net sales, operating earnings (and earnings
from continuing operations before provision for income taxes) and EBITDA of
approximately $41.3 million, $0.4 million and $1.4 million, respectively, for
the year ended December 31, 1997 and net sales, operating earnings (and earnings
from continuing operations before provision for income taxes) and EBITDA of
approximately $21.5 million, $0.4 million and $0.7 million, respectively, for
the six months ended July 4, 1998. On July 31, 1998, the Company completed the
sale of another Ply Gem business, Ply Gem Manufacturing, which had net sales,
operating earnings (and earnings from continuing operations before provision for
income taxes) and EBITDA of approximately $49.7 million, $2.5 million and $2.8
million, respectively, for the year ended December 31, 1997 and net sales,
operating earnings (and earnings from continuing operations before provision for
income taxes) and EBITDA of approximately $23.3 million, $0.7 million and $0.7
million, respectively, for the seven months ended July 31, 1998. On December 10,
1998, the Company sold Allied for approximately $16.5 million in cash and
approximately $7.0 million in notes. Allied had net sales, operating earnings
(and earnings from continuing operations before provision for income taxes) and
EBITDA of approximately $67.3 million, $1.2 million and $1.4 million,
respectively, for the nine months ended October 3, 1998. The operating results
of Sagebrush, Goldenberg Ply Gem Manufacturing and Allied are included in the
Company's 1997 and 1998 consolidated results from the date of acquisition to the
date of sale. The sale of these businesses did not have a material effect on the
Company's operating or financial position. On December 30, 1998, the Company
sold the businesses of two wholly-owned subsidiaries -- M&S and MOM -- to the
Chamberlain Group, Inc. for approximately $27.5 million in cash. M&S
manufactures and sells intercom systems, built-in music systems, central vacuum
systems and related products. MOM sells automatic garage door openers, gate
operators and electronic transmitters. For the year ended December 31, 1997, net
sales, operating earnings (and earnings from continuing operations before income
taxes) and EBITDA of M&S and MOM combined were approximately $37.3 million, $3.4
million and $4.1 million, respectively. For the nine months ended October 3,
1998, net sales, operating earnings (and earnings from continuing operations
before income taxes) and EBITDA of M&S and MOM combined were approximately $31.7
million, $2.7 million and $3.3 million, respectively. As of February 9, 1999,
approxi-
 
                                       29
<PAGE>   31
 
mately $27.7 million of the proceeds from the sale of Studley, Sagebrush,
Goldenberg, PlyGem Manufacturing and Allied was used to pay down debt, including
$25.5 million under the Ply Gem Credit Facility. The remaining proceeds
(including the proceeds from the sale of URC, M&S and MOM) of approximately
$84.8 million were used for general corporate purposes.
 
Other Developments
 
     On June 16, 1998, the Company announced the formation of Ventrol, a new
corporation for the manufacture of HVAC products in Montreal, Canada. Ventrol
will be a part of the Company's Air Conditioning and Heating Products Group.
Ventrol will fabricate custom air handling and heat recovery equipment to serve
the commercial and industrial markets in Canada and the eastern United States.
As of February 9, 1999, Ventrol's newly constructed state-of-the-art
manufacturing facility was substantially completed and the Company expects to
begin filling customers' orders by the end of the first quarter of 1999. At full
capacity, the plant is expected to occupy 150,000 square feet and employ
approximately 230 people.
 
     On October 9, 1998, the Company completed the acquisition of Napco, Inc., a
privately held manufacturer of exterior building products headquartered in
Valencia, Pennsylvania for approximately $81.2 million in cash plus the
assumption of debt of approximately $10.2 million. The acquisition was funded
through the use of unrestricted cash, cash equivalents and marketable
securities. Napco manufactures four principal product lines: (a) vinyl siding,
soffit and accessories, marketed under the American Comfort(R), American
Herald(TM) and American '76(TM) collection labels; (b) vinyl window systems,
marketed under the Premium and American Comfort(R) labels; (c) accessory
products, including aluminum-trim coil, soffit, rainware and related specialty
products; and (d) coil coating. Napco's manufacturing operations are conducted
in three company-owned plants that are located within a few miles of each other
in western Pennsylvania, 25 miles north of Pittsburgh. For the year ended
December 31, 1997, Napco had net sales, operating earnings, earnings from
continuing operations before provision for income taxes and EBITDA of
approximately $91.1 million, $8.6 million, $8.0 million and $10.8 million,
respectively.
 
                                       30
<PAGE>   32
 
                                USE OF PROCEEDS
 
     The Company will not receive any cash proceeds from the issuance of the
Exchange Notes. The Company is issuing the Exchange Notes in exchange for the
Original Notes in order to fulfill its obligations under the Registration Rights
Agreement. Properly tendered Original Notes will be retired and canceled.
 
     For a description of the use of proceeds from the sale of the Original
Notes, see "The Acquisition."
 
                                 CAPITALIZATION
 
     The following table sets forth at October 3, 1998 the short-term debt and
capitalization of the Company. The information presented below should be read in
conjunction with the Consolidated Financial Statements of the Company and Notes
thereto.
 
<TABLE>
<CAPTION>
                                                                 OCTOBER 3, 1998
                                                              ---------------------
                                                                   HISTORICAL
                                                              ---------------------
                                                                   (DOLLARS IN
                                                                    MILLIONS)
<S>                                                           <C>
Short-term debt:
     Short-term borrowings..................................        $   10.4
     Current maturities of long-term debt...................             5.8
                                                                    --------
          Total short-term debt.............................        $   16.2
                                                                    ========
Long-term debt:
     Notes, mortgage notes and other........................        $  112.9
     9 1/4% Senior Notes due 2007...........................           174.1
     9 1/8% Senior Notes due 2007...........................           307.7
     8 7/8% Senior Notes due 2008...........................           209.3
     9 7/8% Senior Subordinated Notes due 2004..............           206.7
                                                                    --------
          Total long-term debt(1)...........................        $1,010.7
                                                                    --------
Stockholders' investment(2):
     Preference stock, $1.00 par value; 7,000,000 shares
      authorized, none issued...............................        $     --
     Common stock, $1.00 par value; 40,000,000 shares
      authorized; 18,417,000 shares issued..................            18.4
     Special common stock, $1.00 par value; 5,000,000 shares
      authorized; 857,447 shares issued.....................              .9
     Additional paid-in capital.............................           200.8
     Retained earnings......................................            82.6
     Cumulative translation, pension and other
      adjustments...........................................            (6.0)
     Less: Treasury stock, at cost, 7,252,835 common shares
      and 286,009 special common shares.....................           (84.5)
                                                                    --------
          Total stockholders' investment....................        $  212.2
                                                                    --------
          Total capitalization..............................        $1,222.9
                                                                    ========
</TABLE>
 
- ---------------
(1) Long-term debt is net of $5.1 million of unamortized debt discount.
 
(2) Excludes (i) 1,925,855 shares of common stock, $1.00 par value (the "Common
    Stock") at October 3, 1998 which have been reserved for issuance pursuant to
    options and the conversion of the Company's special common stock, $1.00 par
    value (the "Special Common Stock"), (ii) 1,119,349 shares of Special Common
    stock at October 3, 1998 which have been reserved for issuance pursuant to
    options and (iii) 117,356 shares of Series A Participating Preference Stock
    (the "Preference Stock") which may be issuable upon exercise of rights under
    the Rights Agreement, as amended and restated as of April 2, 1996, between
    the Company and State Street Bank and Trust Company.
 
                                       31
<PAGE>   33
 
                              UNAUDITED PRO FORMA
                     CONDENSED CONSOLIDATED FINANCIAL DATA
 
OVERVIEW
 
   
     The Unaudited Pro Forma Condensed Consolidated Financial Data for the year
ended December 31, 1997 and the nine months ended October 3, 1998 and September
27, 1997 presented herein gives pro forma effect to certain transactions.
Transactions for which pro forma information is provided include the 9 1/4%
Notes, the 9 1/8% Notes, the Ply Gem Acquisition, the Common Stock Offering, the
Offering and the Acquisition.
    
 
     The Ply Gem Acquisition and the Acquisition are accounted for under the
purchase method of accounting. With respect to these acquisitions, the
information contained herein has been prepared utilizing preliminary purchase
price allocations which are subject to refinement until all pertinent
information regarding the acquisitions has been obtained. This pertinent
information to be received includes independent third party estimates of the
fair value and useful lives of certain tangible and intangible assets acquired,
independent third party estimates of pre-acquisition insurance reserve
requirements and the Company's final integration plan for the Acquisition. The
Company does not expect that the final purchase price allocations of the Ply Gem
Acquisition and the Acquisition will have a material effect on its consolidated
results of operations or financial position.
 
     The financial information entitled "Unaudited Pro Forma" is not necessarily
indicative of the actual results of operations that would have been reported if
the events described above had occurred during the applicable period, nor does
such information purport to be indicative of the results of future operations.
Furthermore, such information may not give effect to all cost savings or
incremental costs that may occur as a result of the integration and
consolidation of the acquisitions of Ply Gem and NuTone. In the opinion of
management, all adjustments necessary to present fairly, in all material
respects, such "Unaudited Pro Forma" financial information have been made.
 
   
     During 1998, the Company sold several nonstrategic assets including
Studley, Sagebrush, Goldenberg, Ply Gem Manufacturing, Allied, M&S and MOM. On
October 9, 1998 the Company acquired Napco. The following Pro Forma Condensed
Consolidated Financial Data does not give pro forma effect to the dispositions
of businesses that have occurred in 1998 or the acquisition of Napco. See
"Recent Developments."
    
 
     The Unaudited Pro Forma Condensed Consolidated Financial Data should be
read in conjunction with "Capitalization," "Management's Discussion and Analysis
of Financial Condition and Results of Operations," the audited and unaudited
Nortek Consolidated Financial Statements and the Notes thereto, the audited Ply
Gem Consolidated Financial Statements and the Notes thereto and the audited and
unaudited NuTone Consolidated Financial Statements and the Notes thereto
included elsewhere herein.
 
UNAUDITED PRO FORMA CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS FOR THE PLY
GEM ACQUISITION
 
   
     The Unaudited Pro Forma (for Ply Gem) Condensed Consolidated Statement of
Operations for the year ended December 31, 1997 and the nine months ended
September 27, 1997 have been prepared using, as applicable: (i) Nortek's Audited
Consolidated Statement of Operations for the year ended December 31, 1997 (which
includes the operations of Ply Gem since August 26, 1997), (ii) Nortek's
Unaudited Condensed Consolidated Statement of Operations for the nine months
ended September 27, 1997 (which includes the operations of Ply Gem since August
26, 1997) and Ply Gem's unaudited results of operations for the period from
January 1, 1997 through August 25, 1997.
    
 
   
     The Unaudited Pro Forma (for Ply Gem) Condensed Consolidated Statement of
Operations for the year ended December 31, 1997 and the nine months ended
September 27, 1997 give pro forma effect to, as applicable: (i) the 9 1/4%
Notes; (ii) the 9 1/8% Notes; (iii) the Ply Gem Acquisition; (iv) cost savings
that are directly attributable to the Ply Gem Acquisition (the "Ply Gem
Acquisition Related Cost Savings"); and
    
 
                                       32
<PAGE>   34
 
(v) the Common Stock Offering, in each case as if such events occurred on
January 1, 1997 (collectively, the "Pro Forma Ply Gem Adjustments").
 
     The Unaudited Pro Forma (for Ply Gem) Condensed Consolidated Statement of
Operations for the year ended December 31, 1997 and the nine months ended
September 27, 1997 do not give effect to estimated additional cost savings and
reductions related to the Ply Gem Acquisition of approximately $14.0 million for
the year ended December 31, 1997 and the nine months ended September 27, 1997
(cost savings and reductions are estimated and actual savings achieved could
differ materially).
 
UNAUDITED PRO FORMA CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS FOR THE PLY
GEM ACQUISITION AND THE ACQUISITION
 
     The Unaudited Pro Forma (for Ply Gem and NuTone) Condensed Consolidated
Statement of Operations for the year ended December 31, 1997 and the nine months
ended October 3, 1998 and September 27, 1997 have been prepared using, as
applicable: (i) Nortek's Audited Consolidated Statement of Operations for the
year ended December 31, 1997 (which includes the operations of Ply Gem from
August 26, 1997 to December 31, 1997); (ii) Ply Gem's Unaudited Results of
Operations for the period January 1, 1997 through August 25, 1997; (iii)
NuTone's Audited Consolidated Statement of Operations for the year ended
December 31, 1997; (iv) Nortek's Unaudited Condensed Consolidated Statements of
Operations for the nine months ended October 3, 1998 (which includes the
operations of NuTone from August 1, 1998 to October 3, 1998); (v) Nortek's
Unaudited Condensed Consolidated Statement of Operations for the nine months
ended September 27, 1997 (which includes the operations of Ply Gem since August
26, 1997) and (vi) NuTone's Unaudited Results of Operations for the period from
January 1, 1998 to July 31, 1998 and the nine months ended September 27, 1997.
 
     The information entitled "Pro Forma Company" gives effect to: (i) the Pro
Forma effect of the acquisition of Ply Gem for the year ended December 31, 1997;
(ii) the Acquisition; (iii) net savings expected to be achieved from the
elimination of fees and charges paid by NuTone to Williams plc and related
entities; (iv) the Offering and (v) and Pro Forma Adjustments related to the
Acquisition. The Company believes that the historical net sales and expenses of
NuTone would not have materially changed without the management services
provided by Williams.
 
     The Unaudited Pro Forma Condensed Consolidated Statement of Operations for
the Ply Gem Acquisition and the Acquisition for the year ended December 31, 1997
and the nine months ended September 27, 1997 do not reflect approximately $14.0
million of estimated cost savings and reductions related to the Ply Gem
Acquisition for the year ended December 31, 1997 and the nine months ended
September 27, 1997 and does not reflect approximately $15.0 million in
annualized estimated cost reductions, from year ended December 31, 1997 levels,
related to the Acquisition, that the Company expects to achieve within 12 to 18
months following the Acquisition. The information entitled Pro Forma Company
results for the nine months ended October 3, 1998 and September 27, 1997 does
not give pro forma effect to any portion of the $15.0 million in estimated
annualized cost reductions expected to be achieved as a result of the
Acquisition as noted above. The cost savings and reductions as a result of the
acquisitions of Ply Gem and NuTone are estimates and actual savings achieved
could differ materially.
 
                                       33
<PAGE>   35
 
                  UNAUDITED PRO FORMA (FOR PLY GEM AND NUTONE)
                 CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS
                      FOR THE YEAR ENDED DECEMBER 31, 1997
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 
   
<TABLE>
<CAPTION>
                                                           PRO FORMA
                                                             NORTEK
                                                              AND          NUTONE        PRO FORMA      PRO FORMA
                                                            PLY GEM     HISTORICAL(a)   ADJUSTMENTS      COMPANY
                                                           ---------    -------------   -----------     ---------
<S>                                                        <C>          <C>             <C>             <C>
Net sales................................................  $1,650,052     $199,072       $     --       $1,849,124
Cost and expenses:
    Cost of products sold................................   1,248,749      122,897             --        1,371,646
    Amortization of acquired goodwill....................      10,114           --          5,965(b)        16,079
    Selling, general and administrative expense..........     303,869       51,387         (1,746)(c)      353,510
                                                           ----------     --------       --------       ----------
                                                            1,562,732      174,284          4,219        1,741,235
                                                           ----------     --------       --------       ----------
Operating earnings (loss)................................      87,320       24,788         (4,219)         107,889
Interest expense.........................................     (77,793)     (11,852)        (7,483)(d)      (97,128)
Investment income........................................       7,489           42             --(e)         7,531
                                                           ----------     --------       --------       ----------
Earnings (loss) from continuing operations before
  provision (benefit) for income taxes...................      17,016       12,978        (11,702)          18,292
Provision (benefit) for income taxes.....................       8,771        5,043         (1,470)(f)       12,344
                                                           ----------     --------       --------       ----------
Earnings (loss) from continuing operations...............  $    8,245     $  7,935       $(10,232)      $    5,948
                                                           ==========     ========       ========       ==========
EARNINGS PER SHARE AS ADJUSTED FOR THE COMMON STOCK
  OFFERING:
Earnings from continuing operations:
    Basic................................................  $      .70                                   $      .50
    Diluted..............................................         .68                                          .49
Weighted average number of shares:
    Basic................................................      11,788                                       11,788
    Diluted..............................................      12,038                                       12,038
</TABLE>
    
 
         See Notes to the Unaudited Pro Forma (For Ply Gem and NuTone)
                 Condensed Consolidated Statement of Operations
                                       34
<PAGE>   36
 
                  UNAUDITED PRO FORMA (FOR PLY GEM AND NUTONE)
                 CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS
                   FOR THE NINE MONTHS ENDED OCTOBER 3, 1998
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 
<TABLE>
<CAPTION>
                                                         NORTEK        NUTONE        PRO FORMA     PRO FORMA
                                                       HISTORICAL   HISTORICAL(A)   ADJUSTMENTS     COMPANY
                                                       ----------   -------------   -----------    ----------
<S>                                                    <C>          <C>             <C>            <C>
Net sales............................................  $1,300,308     $110,661        $    --      $1,410,969
Cost and expenses:
  Cost of products sold..............................     960,168       69,899             --       1,030,067
  Amortization of acquired goodwill..................       8,784           --          3,479(b)       12,263
  Selling, general and administrative expense........     234,222       28,430           (353)(c)     262,299
                                                       ----------     --------        -------      ----------
                                                        1,203,174       98,329          3,126       1,304,629
                                                       ----------     --------        -------      ----------
Operating earnings (loss)............................      97,134       12,332         (3,126)        106,340
  Interest expense...................................     (62,126)      (7,081)        (4,198)(d)     (73,405)
  Investment income..................................       7,492           16           (450)(e)       7,058
                                                       ----------     --------        -------      ----------
Earnings (loss) from continuing operations before
  provision for income taxes.........................      42,500        5,267         (7,774)         39,993
Provision (benefit) for income taxes.................      19,400        2,107         (1,137)(f)      20,370
                                                       ----------     --------        -------      ----------
Earnings (loss) from continuing operations...........  $   23,100     $  3,160        $(6,637)         19,623
                                                       ==========     ========        =======      ==========
HISTORICAL EARNINGS PER SHARE:
Earnings from continuing operations:
  Basic..............................................  $     2.17
  Diluted............................................        2.13
Weighted average number of shares:
  Basic..............................................      10,660
  Diluted............................................      10,858
EARNINGS PER SHARE AS ADJUSTED FOR THE COMMON STOCK OFFERING:
Earnings from continuing operations:
  Basic..............................................  $     1.97                                  $     1.67
  Diluted............................................        1.94                                        1.65
Weighted average number of shares:
  Basic..............................................      11,729                                      11,729
  Diluted............................................      11,927                                      11,927
</TABLE>
 
         See Notes to the Unaudited Pro Forma (For Ply Gem and NuTone)
                 Condensed Consolidated Statement of Operations
                                       35
<PAGE>   37
 
                  UNAUDITED PRO FORMA (FOR PLY GEM AND NUTONE)
                 CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS
   
                  FOR THE NINE MONTHS ENDED SEPTEMBER 27, 1997
    
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 
   
<TABLE>
<CAPTION>
                                                 PRO FORMA
                                                 NORTEK AND       NUTONE         PRO FORMA     PRO FORMA
                                                  PLY GEM      HISTORICAL(A)    ADJUSTMENTS     COMPANY
                                                 ----------    -------------    -----------    ----------
<S>                                              <C>           <C>              <C>            <C>
Net sales......................................  $1,234,336      $144,985         $    --      $1,379,321
Cost and expenses:
  Cost of products sold........................     938,083        90,013              --       1,028,096
  Amortization of acquired goodwill............       7,656            --           4,473(b)       12,129
  Selling, general and administrative
     expense...................................     228,652        37,797          (2,586)(c)     263,863
                                                 ----------      --------         -------      ----------
                                                  1,174,391       127,810           1,887       1,304,088
                                                 ----------      --------         -------      ----------
Operating earnings (loss)......................      59,945        17,175          (1,887)         75,233
Interest expense...............................     (58,672)       (8,972)         (5,529)(d)     (73,173)
Investment income..............................       5,243            27              --(e)        5,270
                                                 ----------      --------         -------      ----------
Earnings (loss) from continuing operations
  before provision (benefit) for income
  taxes........................................       6,516         8,230          (7,416)          7,330
Provision (benefit) for income taxes...........       3,871         3,292            (455)(f)       6,708
                                                 ----------      --------         -------      ----------
Earnings (loss) from continuing operations.....  $    2,645      $  4,938         $(6,961)     $      622
                                                 ==========      ========         =======      ==========
EARNINGS PER SHARE AS ADJUSTED FOR THE COMMON
  STOCK OFFERING:
Earnings from continuing operations:
  Basic........................................  $      .22                                    $      .05
  Diluted......................................         .22                                           .05
Weighted average number of shares:
  Basic........................................      11,815                                        11,815
  Diluted......................................      12,061                                        12,061
</TABLE>
    
 
         See Notes to the Unaudited Pro Forma (For Ply Gem and NuTone)
                 Condensed Consolidated Statement of Operations
                                       36
<PAGE>   38
 
                        NOTES TO THE UNAUDITED PRO FORMA
                            (FOR PLY GEM AND NUTONE)
                 CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                  NINE MONTHS    NINE MONTHS
                                                                                     ENDED          ENDED
                                                                 YEAR ENDED       OCTOBER 3,    SEPTEMBER 27,
                                                              DECEMBER 31, 1997      1998           1997
                                                              -----------------   -----------   -------------
<S>                                                           <C>                 <C>           <C>
(a) NUTONE HISTORICAL
The Company acquired NuTone on July 31, 1998. The Pro Forma
  results for the year ended December 31, 1997 and the nine
  months ended September 27, 1997 include actual historical
  results of NuTone for those periods. For purposes of
  calculating Pro Forma results for the nine months ended
  October 3, 1998 and September 27, 1997, the statement of
  operations reflects NuTone's actual historical results
  prior to the Acquisition.
 
(b) AMORTIZATION OF ACQUIRED GOODWILL
Amortization of goodwill over 40 years related to the
  Acquisition...............................................      $  5,965         $  3,479       $  4,473
                                                                  ========         ========       ========
(c) SELLING, GENERAL AND ADMINISTRATIVE EXPENSE
Elimination of management fees and other charges paid by
  NuTone to Williams plc and related entities, net of
  estimated incremental Nortek management costs including
  approximately $150,000 of annual estimated general
  corporate overhead expenses...............................      $ (1,746)        $   (353)      $ (2,586)
                                                                  ========         ========       ========
(d) INTEREST EXPENSE
Interest expense related to the Offering....................      $(18,637)        $(10,872)      $(13,978)
Amortization of debt issuance costs related to the
  Offering..................................................          (649)            (379)          (487)
Amortization of debt discount related to the Offering.......           (49)             (29)           (37)
Reduction of interest expense related to intercompany
  borrowings not assumed in the Acquisition.................        11,852            7,082          8,973
                                                                  --------         --------       --------
                                                                  $ (7,483)        $ (4,198)      $ (5,529)
                                                                  ========         ========       ========
(e) INVESTMENT INCOME
Reduction in interest income on cash and cash equivalents
  used to fund the Acquisition..............................      $     --         $   (450)      $     --
                                                                  ========         ========       ========
(f) PROVISION (BENEFIT) FOR INCOME TAXES
Net income tax benefit related to notes (b) through (d)
  above.....................................................      $ (1,470)        $ (1,137)      $   (455)
                                                                  ========         ========       ========
</TABLE>
 
                                       37
<PAGE>   39
 
                       UNAUDITED PRO FORMA (FOR PLY GEM)
                 CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS
                      FOR THE YEAR ENDED DECEMBER 31, 1997
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 
   
<TABLE>
<CAPTION>
                                                                                                   PRO FORMA
                                                         NORTEK        PLY GEM       PRO FORMA     NORTEK AND
                                                       HISTORICAL   HISTORICAL(A)   ADJUSTMENTS     PLY GEM
                                                       ----------   -------------   -----------    ----------
<S>                                                    <C>          <C>             <C>            <C>
Net sales............................................  $1,134,129     $515,923       $     --      $1,650,052
Cost and expenses:
    Cost of products sold............................     826,453      423,596         (1,300)(b)   1,248,749
    Amortization of acquired goodwill................       5,319          976          3,819(c)       10,114
    Selling, general and administrative expense......     219,376       91,263         (6,770)(d)     303,869
                                                       ----------     --------       --------      ----------
                                                        1,051,148      515,835         (4,251)      1,562,732
                                                       ----------     --------       --------      ----------
Operating earnings...................................      82,981           88          4,251          87,320
Interest expense.....................................     (50,210)      (5,696)       (21,887)(e)     (77,793)
Investment income....................................       9,929          302         (2,742)(f)       7,489
                                                       ----------     --------       --------      ----------
Earnings (loss) from continuing operations before
  provision (benefit) for income taxes...............      42,700       (5,306)       (20,378)         17,016
Provision (benefit) for income taxes.................      16,300       (1,984)        (5,545)(g)       8,771
                                                       ----------     --------       --------      ----------
Earnings (loss) from continuing operations...........  $   26,400     $ (3,322)      $(14,833)     $    8,245
                                                       ==========     ========       ========      ==========
HISTORICAL EARNINGS PER SHARE:
Earnings from continuing operations:
    Basic............................................  $     2.75
    Diluted..........................................        2.68
Weighted average number of shares:
    Basic............................................       9,605
    Diluted..........................................       9,855
EARNINGS PER SHARE AS ADJUSTED FOR THE COMMON STOCK
  OFFERING:
Earnings from continuing operations:
    Basic............................................  $     2.24                                  $      .70
    Diluted..........................................        2.19                                         .68
Weighted average number of shares:
    Basic............................................      11,788                                      11,788
    Diluted..........................................      12,038                                      12,038
</TABLE>
    
 
               See Notes to the Unaudited Pro Forma (For Ply Gem)
                 Condensed Consolidated Statement of Operations
                                       38
<PAGE>   40
 
                       UNAUDITED PRO FORMA (FOR PLY GEM)
                 CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS
   
                  FOR THE NINE MONTHS ENDED SEPTEMBER 27, 1997
    
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 
   
<TABLE>
<CAPTION>
                                                                                                     PRO FORMA
                                                           NORTEK        PLY GEM       PRO FORMA     NORTEK AND
                                                         HISTORICAL   HISTORICAL(A)   ADJUSTMENTS     PLY GEM
                                                         ----------   -------------   -----------    ----------
<S>                                                      <C>          <C>             <C>            <C>
Net sales..............................................   $718,413      $515,923       $     --      $1,234,336
Cost and expenses:
    Cost of products sold..............................    515,787       423,596         (1,300)(b)     938,083
    Amortization of acquired goodwill..................      2,861           976          3,819(c)        7,656
    Selling, general and administrative expense........    144,159        91,263         (6,770)(d)     228,652
                                                          --------      --------       --------      ----------
                                                           662,807       515,835         (4,251)      1,174,391
                                                          --------      --------       --------      ----------
Operating earnings.....................................     55,606            88          4,251          59,945
Interest expense.......................................    (31,089)       (5,696)       (21,887)(e)     (58,672)
Investment income......................................      7,683           302         (2,742)(f)       5,243
                                                          --------      --------       --------      ----------
Earnings (loss) from continuing operations before
  provision (benefit) for income taxes.................     32,200        (5,306)       (20,378)          6,516
Provision (benefit) for income taxes...................     11,400        (1,984)        (5,545)(g)       3,871
                                                          --------      --------       --------      ----------
Earnings from continuing operations....................   $ 20,800      $ (3,322)      $(14,833)     $    2,645
                                                          ========      ========       ========      ==========
HISTORICAL EARNINGS PER SHARE:
Earnings from continuing operations:
    Basic..............................................   $   2.16
    Diluted............................................       2.11
Weighted average number of shares:
    Basic..............................................      9,632
    Diluted............................................      9,878
EARNINGS PER SHARE AS ADJUSTED FOR THE COMMON STOCK
  OFFERING:
Earnings from continuing operations:
    Basic..............................................   $   1.76                                   $      .22
    Diluted............................................       1.72                                          .22
Weighted average number of shares:
    Basic..............................................     11,815                                       11,815
    Diluted............................................     12,061                                       12,061
</TABLE>
    
 
               See Notes to the Unaudited Pro Forma (For Ply Gem)
                 Condensed Consolidated Statement of Operations
                                       39
<PAGE>   41
 
                        NOTES TO THE UNAUDITED PRO FORMA
                                 (FOR PLY GEM)
                 CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                              NINE MONTHS
                                                               YEAR ENDED        ENDED
                                                              DECEMBER 31,   SEPTEMBER 27,
                                                                  1997           1997
                                                              ------------   -------------
<S>                                                           <C>            <C>
(a) PLY GEM HISTORICAL
Amounts for the year ended December 31, 1997 and the nine
  months ended September 27, 1997 include the unaudited
  results of Ply Gem for the period from January 1, 1997 to
  August 25, 1997.
(b) COST OF PRODUCTS SOLD
The effect on depreciation expense of changing the estimated
  future lives and increasing the estimated fair value of
  property, plant and equipment:
Depreciation expense based on Ply Gem's historical estimated
  lives of property, plant and
  equipment.................................................    $(13,600)      $(13,600)
Depreciation expense based on revised estimated lives of
  property, plant and equipment.............................       9,500          9,500
                                                                --------       --------
  The net effect of changing estimated lives of property,
    plant and equipment.....................................      (4,100)        (4,100)
  The effect on depreciation expense of increasing the
    estimated fair value of property, plant and equipment...       2,800          2,800
                                                                --------       --------
                                                                $ (1,300)      $ (1,300)
                                                                ========       ========
(c) AMORTIZATION OF ACQUIRED GOODWILL
Increase amortization of goodwill over 40 years due to the
  Ply Gem Acquisition.......................................    $  4,795       $  4,795
Reduction of PlyGem's goodwill amortization.................        (976)          (976)
                                                                --------       --------
                                                                   3,819          3,819
                                                                ========       ========
(d) SELLING, GENERAL AND ADMINISTRATIVE EXPENSE
Estimated Ply Gem Acquisition Related Cost Savings..........    $ (3,983)      $ (3,983)
Reduction of intangible amortization included in Ply Gem's
  selling, general and administrative expense...............        (757)          (757)
Decrease due to termination and repurchase of amounts
  outstanding under Ply Gem's accounts receivable
  securitization program....................................      (2,030)        (2,030)
                                                                --------       --------
                                                                $ (6,770)      $ (6,770)
                                                                ========       ========
(e) INTEREST EXPENSE
Interest expense related to the 9 1/4% Notes................    $ (3,438)      $ (3,438)
Amortization of related debt issuance costs of the 9 1/4%
  Notes.....................................................        (106)          (106)
Reduction of interest expense related to debt refinanced
  with a portion of the proceeds from the 9 1/4% Notes......       1,143          1,143
Interest expense related to the 9 1/8% Notes................     (18,495)       (18,495)
Amortization of related debt discount and issuance costs of
  the 9 1/8% Notes..........................................        (771)          (771)
Interest expense at an assumed average rate of 6.85% on
  indebtedness outstanding under the Ply Gem Credit Facility
  including approximately $2,201 of interest expense related
  to incremental debt incurred to repurchase accounts
  receivable under Ply Gem's accounts receivable
  securitization program....................................      (4,971)        (4,971)
Reduction in interest expense related to the refinancing of
  Ply Gem indebtedness at the date of the Ply Gem
  Acquisition...............................................       4,751          4,751
                                                                --------       --------
                                                                $(21,887)      $(21,887)
                                                                ========       ========
(f) INVESTMENT INCOME
Reduction in interest income on marketable securities sold
  to fund the Ply Gem Acquisition and related
  transactions..............................................    $ (2,742)      $ (2,742)
                                                                ========       ========
(g) PROVISION (BENEFIT) FOR INCOME TAXES
Net benefit for income taxes related to notes (b), (d), (e)
  and (f) above.............................................    $ (5,545)      $ (5,545)
                                                                ========       ========
</TABLE>
 
                                       40
<PAGE>   42
 
                SELECTED HISTORICAL CONSOLIDATED FINANCIAL DATA
 
     The selected consolidated operating and balance sheet data for each of the
five years in the period ended December 31, 1997 and as of the end of each such
period are derived from Nortek's consolidated financial statements which were
audited by Arthur Andersen LLP, independent public accountants. The selected
consolidated operating and balance sheet data for the nine months ended
September 27, 1997 and October 3, 1998 and as of the end of each such period
have been derived from Nortek's unaudited condensed consolidated financial
statements, which reflect, in the opinion of Nortek all adjustments of a normal
recurring nature necessary for a fair statement of the interim periods
presented. The results of operations for the nine months ended October 3, 1998
are not necessarily indicative of the results of operations to be expected for
the full year. The following selected consolidated financial data should be read
in conjunction with the Consolidated Financial Statements and the Notes thereto
and the information contained in "Management's Discussion and Analysis of
Financial Condition and Results of Operations" of Nortek and the information
contained in "Unaudited Pro Forma Condensed Consolidated Financial Data"
included elsewhere herein. Certain amounts in the prior period's financial
statements have been reclassified to conform to the presentation at October 3,
1998.
 
<TABLE>
<CAPTION>
                                                                                                     NINE MONTHS ENDED
                                                          YEAR ENDED DECEMBER 31,                --------------------------
                                              ------------------------------------------------   SEPTEMBER 27,   OCTOBER 3,
                                              1993(3)   1994(3)    1995      1996       1997         1997           1998
                                              -------   -------    ----      ----       ----     -------------   ----------
                                                             (IN MILLIONS EXCEPT PER SHARE DATA AND RATIOS)
<S>                                           <C>       <C>       <C>       <C>       <C>        <C>             <C>
STATEMENT OF OPERATIONS DATA(1)(2):
Net sales...................................  $ 627.5   $ 616.0   $ 656.8   $ 841.6   $1,134.1     $  718.4       $1,300.3
Cost of products sold.......................    433.4     421.9     469.8     597.4      826.4        515.8          960.2
Amortization of acquired goodwill...........      2.4       2.4       2.5       2.9        5.3          2.9            8.8
Selling, general and administrative
  expense...................................    160.0     147.3     141.5     180.3      219.4        144.1          234.2
                                              -------   -------   -------   -------   --------     --------       --------
Operating earnings..........................     31.7      44.4      43.0      61.0       83.0         55.6           97.1
Interest expense............................    (24.2)    (23.8)    (23.0)    (28.4)     (50.2)       (31.1)         (62.1)
Investment income...........................      4.8       5.3       8.1       6.0        9.9          7.7            7.5
Loss on businesses sold(3)..................    (20.3)     (1.8)       --        --         --           --             --
                                              -------   -------   -------   -------   --------     --------       --------
Earnings (loss) from continuing operations
  before provision for income taxes.........     (8.0)     24.1      28.1      38.6       42.7         32.2           42.5
Provision for income taxes..................      2.2       8.7      10.6      14.9       16.3         11.4           19.4
                                              -------   -------   -------   -------   --------     --------       --------
Earnings (loss) from continuing
  operations................................    (10.2)     15.4      17.5      23.7       26.4         20.8           23.1
Earnings (loss) from discontinued
  operations................................     (4.0)      1.8      (2.5)     (1.7)      (5.2)        (2.7)           0.6
Extraordinary gain (loss) from debt
  retirements...............................     (6.1)      0.2        --        --         --           --           (0.1)
Cumulative effect of accounting changes.....     (0.5)      0.4        --        --         --           --             --
                                              -------   -------   -------   -------   --------     --------       --------
Net earnings (loss).........................  $ (20.8)  $  17.8   $  15.0   $  22.0   $   21.2     $   18.1       $   23.6
                                              =======   =======   =======   =======   ========     ========       ========
Earnings (loss) per share from continuing
  operations(4):
    Basic...................................  $ (0.81)  $  1.23   $  1.41   $  2.26   $   2.75     $   2.16       $   2.17
    Diluted.................................    (0.81)     1.21      1.39      2.23       2.68         2.11           2.13
Net earnings (loss) per share(4):
    Basic...................................  $ (1.66)  $  1.42   $  1.21   $  2.10   $   2.21     $   1.87       $   2.21
    Diluted.................................    (1.66)     1.39      1.19      2.07       2.15         1.83           2.17
Weighted average number of shares(4) (in
  thousands):
    Basic...................................   12,532    12,543    12,445    10,485      9,605        9,632         10,660
    Diluted.................................   13,335    13,100    12,569    10,641      9,855        9,878         10,858
OTHER DATA(2):
Capital expenditures........................  $   8.7   $  14.4   $  15.7   $  19.8   $   22.5     $   13.0       $   24.2
Depreciation and amortization including
  non-cash interest.........................     18.0      15.5      16.2      21.0       28.4         18.5           33.5
EBITDA(5)...................................     49.2      58.6      58.1      80.8      109.7         73.1          128.2
Ratio of earnings to fixed charges(6).......       --       1.9x      2.1x      2.3x       1.8x         2.0x           1.6x
CASH FLOW STATEMENT DATA:
Net cash provided by operating activities...     12.4      26.2      33.3      47.4       85.1         35.2           16.7
Net cash provided by (used in) investing
  activities................................     20.2     (56.6)    (35.1)     (5.2)    (423.4)      (458.8)        (269.2)
Net cash provided by (used in) financing
  activities................................       .5       8.6       4.1     (38.3)     423.1        431.6          225.9
</TABLE>
 
                                       41
<PAGE>   43
 
<TABLE>
<CAPTION>
                                                                DECEMBER 31,
                                              ------------------------------------------------   SEPTEMBER 27,   OCTOBER 3,
                                               1993      1994      1995      1996       1997         1997           1998
                                               ----      ----      ----      ----       ----     -------------   ----------
                                                                              (IN MILLIONS)
<S>                                           <C>       <C>       <C>       <C>       <C>        <C>             <C>
BALANCE SHEET DATA:
Cash, cash equivalents and marketable
  securities(7).............................  $  89.2   $ 114.4   $ 112.7   $  97.8   $  168.2     $  160.6       $  207.8
Working capital.............................    133.8     194.3     180.2     163.1      341.8        331.1          382.3
Total assets................................    486.1     494.6     605.0     590.2    1,304.5      1,332.4        1,652.4
Total debt..................................    214.6     223.7     282.1     280.3      853.6        861.1        1,026.9
Stockholders' investment....................    104.0     117.8     131.3     118.8      128.1        127.7          212.2
</TABLE>
 
- ---------------
(1) Acquisitions have been accounted for under the purchase accounting method
    and dispositions have been accounted for as described in Note 2 of the Notes
    to Consolidated Financial Statements of the Company included elsewhere
    herein.
 
(2) In the fourth quarter of 1997, the Company adopted a plan to discontinue its
    plumbing products business. Accordingly, the results of the plumbing
    products business have been excluded from earnings from continuing
    operations and are classified separately as discontinued operations for all
    periods presented. See Notes 9 and 15(H) of the Notes to Consolidated
    Financial Statements of the Company included elsewhere herein.
 
(3) In the third quarter of 1993, the Company provided a pre-tax valuation
    reserve of approximately $20.3 million to reduce the Company's net
    investment in Dixieline to estimated net realizable value. On March 31,
    1994, the Company sold all of the capital stock of Dixieline for
    approximately $18.8 million in cash and $6.0 million in preferred stock of
    the purchaser. No additional loss in 1994 was incurred in connection with
    the sale. In January 1995, the Company paid approximately $1.8 million as a
    final purchase price adjustment related to the sale in 1992 of its wholly
    owned subsidiary Bend and recorded a charge to pre-tax earnings in the
    fourth quarter of 1994.
 
(4) In 1997, the Company adopted the provisions of SFAS No. 128, Earnings Per
    Share. This statement, issued by the FASB in February 1997, establishes
    standards for computing and presenting EPS and applies to entities with
    publicly held common stock. This statement replaces the presentation of
    primary EPS with a presentation of basic EPS and replaces the presentation
    of fully-diluted EPS with diluted EPS. All periods presented have been
    restated to conform to SFAS No. 128.
 
(5) "EBITDA" is operating earnings from continuing operations plus depreciation
    and amortization (other than amortization of deferred debt expense and debt
    discount). EBITDA differs from Consolidated Cash Flow as defined in the
    Indenture. See "Description of Notes -- Certain Definitions." EBITDA should
    not be considered as an alternative to net earnings as a measure of the
    Company's operating results or to cash flows as a measure of liquidity.
    EBITDA principally differs from net increase (decrease) in unrestricted cash
    and cash equivalents shown on the Consolidated Statement of Cash Flows of
    the Company, prepared in accordance with generally accepted accounting
    principles, in that EBITDA does not reflect capital expenditures,
    borrowings, principal and interest payments under debt and capital lease
    obligations, income tax payments and cash flows from operating, investing
    and financing activities. The Company believes that EBITDA may be useful to
    investors in evaluating the Company's ability to service debt and to finance
    growth including acquisitions, capital expenditures and working capital. The
    Company believes that during periods of increasing EBITDA the Company may be
    able to finance its growth including acquisitions, capital expenditures and
    working capital through increased borrowings and the sale of equity. In
    periods of declining EBITDA, the Company may be required to limit or defer
    growth, including acquisitions and capital expenditures, and may be required
    to adopt measures to reduce the level of its expenses and working capital.
    EBITDA as calculated by the Company may differ from EBITDA as calculated by
    other companies.
 
(6) For purposes of calculating this ratio, "earnings" consist of earnings from
    continuing operations before provision for income taxes and fixed charges.
    "Fixed charges' consist of interest expense and the estimated interest
    portion of rental payments on operating leases. Such earnings were
    insufficient to cover fixed charges by approximately $8.0 million for the
    year ended December 31, 1993.
 
(7) Includes restricted cash, investments and marketable securities in the
    amounts of approximately $6.7 million, $9.3 million, $9.4 million, $5.7
    million and $6.3 million at December 31, 1993, 1994, 1995, 1996 and 1997,
    respectively, and $7.0 million and $6.4 million at September 27, 1997 and
    October 3, 1998, respectively.
 
                                       42
<PAGE>   44
 
                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS
 
     The Company is a diversified manufacturer of residential and commercial
building products, operating within four principal product groups: the
Residential Building Products Group; the Air Conditioning and Heating Products
Group; the Windows, Doors and Siding Group; and the Specialty Products and
Distribution Group. Through these product groups, the Company manufactures and
sells, primarily in the United States, Canada and Europe, a wide variety of
products for the residential and commercial construction, manufactured housing
and the DIY and professional remodeling and renovation markets.
 
     In the fourth quarter of 1995, several of the Company's wholly owned
subsidiaries completed the acquisition of the assets, subject to certain
liabilities, of Rangaire, all the capital stock of Best and related entities and
all the capital stock of Venmar.
 
     The Company acquired Ply Gem on August 26, 1997 and NuTone on July 31,
1998. These acquisitions have been accounted for under the purchase method of
accounting. Accordingly, the results of Ply Gem and NuTone are included in the
Company's consolidated results since these dates. See "Liquidity and Capital
Resources" and Notes 1, 2 and 15(E) of the Notes to Consolidated Financial
Statements of the Company included elsewhere herein.
 
     In the fourth quarter of 1997, the Company adopted a plan to discontinue
its plumbing products business. Accordingly, the results of the plumbing
products business has been excluded from earnings from continuing operations and
are classified separately as discontinued operations for all periods presented.
(See Notes 9 and 15(H) of the Notes to Consolidated Financial Statements of the
Company included elsewhere herein.) On July 10, 1998, the Company sold its
plumbing products business, including a product line included in the Residential
Building Products Group, for approximately $33.7 million.
 
   
     During 1998, the Company made several dispositions of nonstrategic assets.
On May 8, 1998, the Company sold Studley. Studley, had net sales and an
operating loss of approximately $22.0 million and $6.1 million for the year
ended December 31, 1997, respectively, and net sales and an operating loss of
approximately $7.3 million and $1.6 million, respectively, for the period
January 1, 1998 to May 8, 1998 and was treated as an operation held for sale
since the Ply Gem Acquisition. Accordingly Studley's operating results are not
included in the Company's consolidated financial results. On May 22, 1998, the
Company consummated the sale of Sagebrush for approximately $9.1 million in
cash. Sagebrush had net sales, operating earnings (and earnings from continuing
operations before provision for income taxes) and EBITDA of $47.6 million, $0.4
million and $0.7 million, respectively, for the year ended December 31, 1997 and
net sales, operating earnings (and earnings from continuing operations before
provision for income taxes) and EBITDA of approximately $19.0 million, $0.2
million and $0.3 million, respectively, for the five months ended May 22, 1998.
On July 2, 1998, the Company completed the sale of Goldenberg for approximately
$11.0 million including approximately $2.1 million in notes. Goldenberg had net
sales, operating earnings (and earnings from continuing operations before
provision for income taxes) and EBITDA of approximately $41.3 million, $0.4
million and $1.4 million, respectively, for the year ended December 31, 1997 and
net sales, operating earnings (and earnings from continuing operations before
income taxes) and EBITDA of approximately $21.5 million, $0.4 million and $0.7
million, respectively, for the six months ended July 4, 1998. On July 31, 1998,
the Company completed the sale of another Ply Gem business, Ply Gem
Manufacturing, which had net sales, operating earnings (and earnings from
continuing operations before provision for income taxes) and EBITDA of
approximately $49.7 million, $2.5 million and $2.8 million, respectively, for
the year ended December 31, 1997 and net sales, operating earnings (and earnings
from continuing operations before income taxes) and EBITDA of approximately
$23.3 million, $0.7 million and $0.7 million, respectively, for the seven months
ended July 31, 1998. On December 10, 1998, the Company sold Allied for
approximately $16.5 million in cash and approximately $7.0 million in Notes.
Allied had net sales, operating earnings (and earnings from continuing
operations before provision for income taxes) and EBITDA of approximately $67.3
million, $1.2 million and $1.4 million, respectively, for the nine months ended
October 3, 1998. On December 30, 1998, the Company sold M&S and MOM for
approximately $27.5 million in cash. M&S manufactures and sells intercom
systems, built-in music systems, central vacuum systems and related products.
MOM sells automatic garage door openers, gate operators and electronic
transmitters. For the year ended December 31,
    
 
                                       43
<PAGE>   45
 
   
1997, net sales, operating earnings (and earnings from continuing operations
before income taxes) and EBITDA of M&S and MOM were approximately $37.3 million,
$3.4 million and $4.1 million, respectively. For the nine months ended October
3, 1998, net sales, operating earnings (and earnings from continuing operations
before income taxes) and EBITDA of M&S and MOM were approximately $31.7 million,
$2.7 million and $3.3 million, respectively. The operating results of Sagebrush,
Goldenberg, Ply Gem Manufacturing, Allied, M&S and MOM are included in the
Company's 1997 and 1998 consolidated results from the date of acquisition to the
date of sale. The Company has not recorded in net earnings any significant
losses associated with these dispositions. As of February 9, 1999 approximately
$27.7 million of the proceeds from the sale of Studley, Sagebrush, Goldenberg,
Ply Gem Manufacturing and Allied was used to pay down debt, including $25.5
million under the Ply Gem Credit Facility. The remaining proceeds (including the
proceeds from the sale of URC, M&S and MOM) of approximately $84.8 million were
used for general corporate purposes.
    
 
   
     The Company does not expect the effect of businesses sold during 1998 to be
significant to the Company's future operations.
    
 
RESULTS OF OPERATIONS
 
     The following tables set forth, for the periods presented, (a) certain
consolidated operating results, (b) the percentage change of such results as
compared to the prior comparable period, (c) the percentage which such results
bears to net sales and (d) the change of such percentages as compared to the
prior comparable period. The results of operations for the three and nine months
ended October 3, 1998 are not necessarily indicative of the results of
operations to be expected for any other interim period or the full year.
 
<TABLE>
<CAPTION>
                                          YEAR ENDED DECEMBER 31,            PERCENTAGE CHANGE
                                        ----------------------------    ----------------------------
                                          1997       1996      1995     1996 TO 1997    1995 TO 1996
                                        --------    ------    ------    ------------    ------------
                                               (IN MILLIONS)
<S>                                     <C>         <C>       <C>       <C>             <C>
Net sales.............................  $1,134.1    $841.6    $656.8         34.8%          28.1%
Cost of products sold.................     826.4     597.4     469.8        (38.3)         (27.2)
Amortization of acquired goodwill.....       5.3       2.9       2.5        (82.8)         (16.0)
Selling, general and administrative
  expense.............................     219.4     180.3     141.5        (21.7)         (27.4)
Operating earnings....................      83.0      61.0      43.0         36.1           41.9
Interest expense......................     (50.2)    (28.4)    (23.0)       (76.8)         (23.5)
Investment income.....................       9.9       6.0       8.1         65.0          (25.9)
Earnings from continuing operations
  before provision for income taxes...      42.7      38.6      28.1         10.6           37.4
Provision for income taxes............      16.3      14.9      10.6         (9.4)         (40.6)
Earnings from continuing operations...      26.4      23.7      17.5         11.4           35.4
Loss from discontinued operations.....      (5.2)     (1.7)     (2.5)      (205.9)          32.0
Net earnings..........................      21.2      22.0      15.0         (3.6)          46.7
</TABLE>
 
                                       44
<PAGE>   46
 
<TABLE>
<CAPTION>
                                            PERCENTAGE OF NET SALES
                                            YEAR ENDED DECEMBER 31,        CHANGE IN PERCENTAGE
                                            -----------------------    ----------------------------
                                            1997     1996     1995     1996 TO 1997    1995 TO 1996
                                            -----    -----    -----    ------------    ------------
<S>                                         <C>      <C>      <C>      <C>             <C>
Net sales.................................  100.0%   100.0%   100.0%         --              --
Cost of products sold.....................   72.9     71.0     71.5        (1.9)            0.5
Amortization of acquired goodwill.........    0.5      0.3      0.4        (0.2)            0.1
Selling, general and administrative
  expense.................................   19.3     21.4     21.5         2.1             0.1
Operating earnings........................    7.3      7.3      6.6          --             0.7
Interest expense..........................   (4.4)    (3.4)    (3.5)       (1.0)            0.1
Investment income.........................    0.9      0.7      1.2         0.2            (0.5)
Earnings from continuing operations before
  provisions for income taxes.............    3.8      4.6      4.3        (0.8)            0.3
Provision for income taxes................    1.4      1.8      1.6         0.4            (0.2)
Earnings from continuing operations.......    2.4      2.8      2.7        (0.4)            0.1
Loss from discontinued operations.........   (0.5)    (0.2)    (0.4)       (0.3)            0.2
Net earnings..............................    1.9      2.6      2.3        (0.7)            0.3
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                    CHANGE IN
                                                 THIRD QUARTER ENDED            THIRD QUARTER 1998
                                            -----------------------------      AS COMPARED TO 1997
                                            OCTOBER 3,      SEPTEMBER 27,      --------------------
                                               1998             1997              $            %
                                            ----------      -------------      -------      -------
                                                         (DOLLAR AMOUNTS IN MILLIONS)
<S>                                         <C>             <C>                <C>          <C>
Net sales.................................    $458.2           $300.4          $ 157.8         52.5%
Cost of products sold.....................     331.6            220.1           (111.5)       (50.7)
Selling, general and administrative
  expense.................................      78.7             55.6            (23.1)       (41.5)
Amortization of acquired goodwill.........       3.6              1.4             (2.2)          NM
                                              ------           ------          -------      -------
Operating earnings........................      44.3             23.3             21.0         90.1
Interest expense..........................     (22.9)           (13.5)            (9.4)       (69.6)
Investment income.........................       3.1              3.1               --           --
                                              ------           ------          -------      -------
Earnings from continuing operations before
  provision for income taxes..............      24.5             12.9             11.6         89.9
Provision for income taxes................      11.2              4.5             (6.7)      (148.9)
                                              ------           ------          -------      -------
Earnings from continuing operations.......      13.3              8.4              4.9         58.3
Earnings (loss) from discontinued
  operations..............................        .6              (.7)             1.3           NM
Extraordinary loss from debt retirement...       (.1)              --              (.1)          NM
                                              ------           ------          -------      -------
Net earnings..............................    $ 13.8           $  7.7          $   6.1         79.2%
                                              ======           ======          =======      =======
</TABLE>
 
- ---------------
 
NM = not meaningful
 
                                       45
<PAGE>   47
 
<TABLE>
<CAPTION>
                                                     PERCENTAGE OF NET SALES
                                                       THIRD QUARTER ENDED         CHANGE IN PERCENTAGE
                                                  -----------------------------       FOR THE THIRD
                                                  OCTOBER 3,      SEPTEMBER 27,      QUARTER 1998 AS
                                                     1998             1997           COMPARED TO 1997
                                                  ----------      -------------    --------------------
<S>                                               <C>             <C>              <C>
Net sales.......................................    100.0%            100.0%                 --
Cost of products sold...........................     72.3              73.3                 1.0
Selling, general and administrative expense.....     17.2              18.5                 1.3
Amortization of acquired goodwill...............       .8                .5                 (.3)
                                                    -----             -----                ----
Operating earnings..............................      9.7               7.7                 2.0
Interest expense................................     (5.0)             (4.5)                (.5)
Investment income...............................       .6               1.1                 (.5)
                                                    -----             -----                ----
Earnings from continuing operations before
  provision for income taxes....................      5.3               4.3                 1.0
Provision for income taxes......................      2.4               1.5                 (.9)
                                                    -----             -----                ----
Earnings from continuing operations.............      2.9               2.8                  .1
Earnings (loss) from discontinued operations....       .1               (.3)                 .4
Extraordinary loss from debt retirement.........       --                --                  --
                                                    -----             -----                ----
Net earnings....................................      3.0%              2.5%                 .5
                                                    =====             =====                ====
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                      CHANGE IN
                                                                                  FIRST NINE MONTHS
                                                        NINE MONTHS ENDED         1998 AS COMPARED
                                                   ---------------------------         TO 1997
                                                   OCTOBER 3,    SEPTEMBER 27,    -----------------
                                                      1998           1997            $         %
                                                   ----------    -------------    -------    ------
                                                             (DOLLAR AMOUNTS IN MILLIONS)
<S>                                                <C>           <C>              <C>        <C>
Net sales........................................   $1,300.3        $718.4        $ 581.9      81.0
Cost of products sold............................      960.2         515.8         (444.4)    (86.2)
Selling, general and administrative expense......      234.2         144.2          (90.0)    (62.4)
Amortization of acquired goodwill................        8.8           2.8           (6.0)       NM
                                                    --------        ------        -------    ------
Operating earnings...............................       97.1          55.6           41.5      74.6
Interest expense.................................      (62.1)        (31.1)         (31.0)    (99.7)
Investment income................................        7.5           7.7            (.2)     (2.6)
                                                    --------        ------        -------    ------
Earnings from continuing operations before
  provision for income taxes.....................       42.5          32.2           10.3      32.0
Provision for income taxes.......................       19.4          11.4           (8.0)    (70.2)
                                                    --------        ------        -------    ------
Earnings from continuing operations..............       23.1          20.8            2.3      11.1
Earnings (loss) from discontinued operations.....         .6          (2.7)           3.3     122.2
Extraordinary loss from debt retirement..........        (.1)           --            (.1)       NM
                                                    --------        ------        -------    ------
Net earnings.....................................   $   23.6        $ 18.1        $   5.5      30.4
                                                    ========        ======        =======    ======
</TABLE>
 
- ---------------
 
NM = not meaningful
 
                                       46
<PAGE>   48
 
<TABLE>
<CAPTION>
                                                    PERCENTAGE OF NET SALES FIRST
                                                          NINE MONTHS ENDED          CHANGE IN PERCENTAGE
                                                    -----------------------------     FOR THE FIRST NINE
                                                    OCTOBER 3,     SEPTEMBER 27,        MONTHS 1998 AS
                                                       1998             1997           COMPARED TO 1997
                                                    -----------    --------------    --------------------
<S>                                                 <C>            <C>               <C>
Net sales.........................................     100.0%          100.0%                  --%
Cost of products sold.............................      73.8            71.8                 (2.0)
Selling, general and administrative expense.......      18.0            20.1                  2.1
Amortization of acquired goodwill.................        .7              .4                  (.3)
                                                       -----           -----                 ----
Operating earnings................................       7.5             7.7                  (.2)
Interest expense..................................      (4.8)           (4.3)                 (.5)
Investment income.................................        .6             1.1                  (.5)
                                                       -----           -----                 ----
Earnings from continuing operations before
  provision for income taxes......................       3.3             4.5                 (1.2)
Provision for income taxes........................       1.5             1.6                   .1
                                                       -----           -----                 ----
Earnings from continuing operations...............       1.8             2.9                 (1.1)
Earnings (loss) from discontinued operations......        --             (.4)                  .4
Extraordinary loss from debt retirement...........        --              --                   --
                                                       -----           -----                 ----
Net earnings......................................       1.8%            2.5%                 (.7)%
                                                       =====           =====                 ====
</TABLE>
 
     The following tables present the net sales for Nortek's principal product
groups for the three years ended December 31, 1997, and for the periods ended
September 27, 1997 and October 3, 1998 and the percentage change of such results
as compared to the prior comparable period. Certain amounts in the table for
prior periods have been reclassified to conform to the presentation for 1998.
 
<TABLE>
<CAPTION>
                                          YEAR ENDED DECEMBER 31,            PERCENTAGE CHANGE
                                        ----------------------------    ----------------------------
                                          1997       1996      1995     1996 TO 1997    1995 TO 1996
                                        --------    ------    ------    ------------    ------------
                                               (IN MILLIONS)
<S>                                     <C>         <C>       <C>       <C>             <C>
Net sales
  Residential Building Products.......  $  430.5    $418.5    $293.4         2.9%           42.6%
  Air Conditioning and Heating
     Products.........................     419.4     423.1     363.4        (0.9)           16.4
  Windows, Doors and Siding...........     189.0        --        --          --              --
  Specialty Products and
     Distribution.....................      95.2        --        --          --              --
                                        --------    ------    ------
                                        $1,134.1    $841.6    $656.8        34.8            28.1
                                        ========    ======    ======
</TABLE>
 
<TABLE>
<CAPTION>
                                                                  THIRD QUARTER ENDED
                                                     ----------------------------------------------
                                                                                       INCREASE
                                                     OCTOBER 3,    SEPTEMBER 27,    ---------------
                                                        1998           1997           $         %
                                                     ----------    -------------    ------    -----
                                                                     (IN MILLIONS)
<S>                                                  <C>           <C>              <C>       <C>
Net sales
  Residential Building Products....................    $141.6         $105.5        $ 36.1     34.2%
  Air Conditioning and Heating Products............     122.0          111.7          10.3      9.2
  Windows, Doors and Siding........................     150.3           55.3          95.0    171.6
  Specialty Products and Distribution..............      44.3           27.9          16.4     59.1
                                                       ------         ------        ------    -----
Total..............................................    $458.2         $300.4        $157.8     52.5%
                                                       ======         ======        ======    =====
</TABLE>
 
                                       47
<PAGE>   49
 
<TABLE>
<CAPTION>
                                                                   NINE MONTHS ENDED
                                                     ----------------------------------------------
                                                                                       INCREASE
                                                     OCTOBER 3,    SEPTEMBER 27,    ---------------
                                                        1998           1997           $         %
                                                     ----------    -------------    ------    -----
                                                                 (IN MILLIONS)
<S>                                                  <C>           <C>              <C>       <C>
Net sales
  Residential Building Products....................   $  369.4        $317.0        $ 52.4     16.5%
  Air Conditioning and Heating Products............      356.6         318.3          38.3     12.1
  Windows, Doors and Siding........................      390.7          55.3         335.4    605.9
  Specialty Products and Distribution..............      183.6          27.8         155.8    559.3
                                                      --------        ------        ------    -----
Total..............................................   $1,300.3        $718.4        $581.9     81.0%
                                                      ========        ======        ======    =====
</TABLE>
 
THIRD QUARTER AND NINE MONTHS ENDED OCTOBER 3, 1998 COMPARED TO THIRD QUARTER
AND
NINE MONTHS ENDED SEPTEMBER 27, 1997
 
     Net sales increased approximately $157,800,000 or approximately 52.5%, (or
increased approximately $158,900,000 or approximately 52.9% excluding the effect
of foreign exchange) in the third quarter of 1998 as compared to the third
quarter of 1997 and increased approximately $581,900,000 or approximately 81.0%,
(or increased approximately $587,600,000 or approximately 81.8% excluding the
effect of foreign exchange) for the first nine months of 1998 as compared to
1997. Net sales increased principally as a result of the acquisition of Ply Gem
on August 26, 1997, which contributed approximately $194,600,000 and
approximately $574,300,000 to net sales in the third quarter and first nine
months of 1998, respectively, as compared to approximately $83,200,000 for the
third quarter and first nine months of 1997 and the acquisition of NuTone on
July 31, 1998 which contributed approximately $33,200,000 to net sales in the
third quarter and first nine months of 1998. Excluding the effect of increased
net sales from the acquisition of Ply Gem and NuTone, net sales increased
approximately $13,200,000 or approximately 6.1% (or increased approximately
$14,300,000, or approximately 6.6% excluding the effect of foreign exchange),
and increased approximately $57,600,000 or approximately 9.1%, (or increased
approximately $63,200,000 or approximately 10.0% excluding the effect of foreign
exchange) for the third quarter and the first nine months of 1998, respectively
as compared to 1997. Excluding the effect of acquisitions, the increase in net
sales in the third quarter and first nine months is principally as a result of
higher sales volume in the Air Conditioning and Heating Products Group related
to products sold to the residential and manufactured housing markets, and to a
lesser extent, increased sales volume in the Residential Building Products
Group.
 
     As noted above, during the second and third quarters of 1998, the Company
sold several nonstrategic assets. The Company's net sales for the first nine
months of 1998, include approximately $63,800,000 of net sales related to
certain businesses of Ply Gem which were sold in various transactions in 1998
and are included in the Specialty Products and Distribution Group.
 
     Cost of products sold as a percentage of net sales decreased from
approximately 73.3% in the third quarter of 1997 to approximately 72.3% in the
third quarter of 1998, and increased from approximately 71.8% in the first nine
months of 1997 to approximately 73.8% in the first nine months of 1998. Changes
in the percentages were, in large part, affected by acquisitions. The Ply Gem
businesses have a higher level of cost of sales than the overall group of
businesses owned prior to the Ply Gem acquisition while NuTone has a lower
percentage. Excluding the effect of acquisitions, cost of products sold as a
percentage of net sales decreased from approximately 70.5% in the third quarter
of 1997 to approximately 68.8% in the third quarter of 1998, and decreased from
approximately 70.7% in the first nine months of 1997 to approximately 69.2% in
the first nine months of 1998. Excluding the effect of acquisitions, the
decreases in the percentages principally resulted from increased sales without a
proportionate increase in costs, including lower material costs, in both periods
in the Air Conditioning and Heating Products Group and, to a lesser extent,
increased net sales without a proportionate increase in costs in the Residential
Building Products Group. Overall, changes in the cost of products sold as a
percentage of net sales for one period as compared to another period may reflect
a number of factors including changes in the relative mix of products sold, the
effect of changes in sales prices, the material cost of products sold and
changes in productivity levels.
 
                                       48
<PAGE>   50
 
     Selling, general and administrative expense as a percentage of net sales
decreased from approximately 18.5% in the third quarter of 1997 to approximately
17.2% in the third quarter of 1998 and decreased from approximately 20.1% in the
first nine months of 1997 to approximately 18.0% in the first nine months of
1998. These decreases in the percentages were principally affected as a result
of acquisitions. Ply Gem has a lower level of selling, general and
administrative expense to net sales than the overall group of businesses owned
prior to the acquisition and NuTone has a higher level of expense. Excluding the
affect of acquisitions, selling, general and administrative expense as a
percentage of net sales decreased from approximately 20.8% in the third quarter
of 1997 to approximately 20.0% in the third quarter of 1998, and decreased
slightly from approximately 21.1% in the first nine months of 1997 to
approximately 20.9% in the first nine months of 1998 in both the Residential
Products and Air Conditioning and Heating Products Groups, as net sales
increased without a proportionate increase in expense.
 
     Amortization of acquired goodwill, as a percentage of net sales, increased
from approximately .5% of net sales in the third quarter of 1997 to
approximately .8% of net sales in the third quarter of 1998, and increased from
approximately .4% of net sales in the first nine months of 1997 to approximately
 .7% in the first nine months of 1998, principally as a result of the
acquisitions of Ply Gem and NuTone.
 
     Consolidated segment earnings were approximately $49,500,000 for the third
quarter of 1998 as compared to approximately $27,200,000 for the third quarter
of 1997, and approximately $109,700,000 for the first nine months of 1998 as
compared to approximately $66,200,000 for the first nine months of 1997. Segment
earnings are operating earnings from continuing operations before corporate and
other expenses that are not directly attributable to the Company's product
groups. Acquisitions contributed approximately $19,500,000 and $5,200,000 to
segment earnings in the third quarter of 1998 and 1997, respectively, and
approximately $30,600,000 and $5,200,000 in the first nine months of 1998 and
1997, respectively. The Company's segment earnings for the first nine months of
1998 include approximately $1,200,000 of earnings related to businesses sold in
1998 (to the date of sale) which are included in the Specialty Products and
Distribution Group. Consolidated segment earnings have been reduced by
consolidated depreciation and amortization expense of approximately $11,100,000
and approximately $7,000,000 for third quarter 1998 and 1997, respectively, and
approximately $30,900,000 and $17,400,000 for the first nine months of 1998 and
1997, respectively. Acquisitions contributed approximately $4,400,000 and
$2,000,000 of the increase in consolidated depreciation and amortization expense
in the third quarter of 1998 and 1997, respectively, and approximately
$13,800,000 and $2,000,000 for the first nine months of 1998 and 1997,
respectively. The overall increase in segment earnings related to businesses
owned prior to the acquisitions was due principally to increased sales volume
without a proportionate increase in cost and expense in the Air Conditioning and
Heating Products Group and, to a lesser extent, in the Residential Building
Products Group.
 
     Earnings of foreign operations, consisting primarily of the results of
operations of the Company's Canadian and European subsidiaries which manufacture
built-in ventilating products were approximately 6.7% and 7.0% of segment
earnings in the third quarter and first nine months of 1998, respectively. Sales
and earnings derived from the international market are subject to the risks of
currency fluctuations.
 
     Operating earnings in the third quarter of 1998 increased approximately
$21,000,000 or approximately 90.1% as compared to the third quarter of 1997, and
increased approximately $41,500,000 or approximately 74.6% as compared to the
first nine months of 1997 primarily due to the factors previously discussed.
 
     Interest expense in the third quarter of 1998 increased approximately
$9,400,000 or approximately 69.6% as compared to the third quarter of 1997, and
increased approximately $31,000,000 or approximately 99.7% as compared to the
first nine months of 1997, primarily as a result of the sale of the 9 1/4% Notes
on March 17, 1997, the sale of the 9 1/8% Notes in August 1997, indebtedness of
Ply Gem existing at the date of acquisition and the sale of the Original Notes
on July 31, 1998. This increase was partially offset by the refinancing of
certain outstanding indebtedness of the Company's subsidiaries in 1997. See
Notes 15(B) and (E) of the Notes to Consolidated Financial Statements included
elsewhere herein.
 
     Investment income was approximately $3,100,000 in the third quarter of 1998
and 1997, and decreased slightly from approximately $7,700,000 in the first nine
months of 1997 to approximately $7,500,000 in the first nine months of 1998 or
approximately 2.6%, principally due to slightly lower yields earned on
short-term investments and marketable securities.
 
                                       49
<PAGE>   51
 
     The provision for income taxes was approximately $11,200,000 for the third
quarter of 1998, as compared to approximately $4,500,000 for the third quarter
of 1997, and approximately $19,400,000 for the first nine months of 1998 as
compared to approximately $11,400,000 for the first nine months of 1997.
 
     The income tax rates differed from the United States Federal statutory rate
of 35% principally as a result of applying an estimated annual effective tax
rate, which rates include the effects of nondeductible amortization expense (for
tax purposes), state income tax provisions, changes in tax reserves, the effect
of foreign income tax on foreign source income and the effect of product
development tax credits from foreign operations.
 
     In the fourth quarter of 1997, the Company adopted a plan to discontinue
its plumbing products business and provided a pre-tax reserve of $2,500,000 for
estimated future losses including interest expense. On July 10, 1998, the
plumbing products business was sold for approximately $33,700,000 in cash and
the Company recorded a $600,000 net after tax gain on the disposition. For the
nine months ended October 3, 1998, approximately $1,000,000 of corporate
interest expense was allocated against this reserve. The loss from discontinued
operations related to the plumbing products business was approximately $900,000
and $4,200,000 excluding income tax benefits of approximately $200,000 and
$1,500,000 for the third quarter and first nine months of 1997, respectively and
reflect an allocation of corporate interest expense of approximately $475,000
and $1,425,000 for the third quarter and the first nine months of 1997,
respectively. See Note 15(H) of the Notes to Consolidated Financial Statements
included elsewhere herein.
 
YEAR ENDED DECEMBER 31, 1997 AS COMPARED TO THE YEAR ENDED DECEMBER 31, 1996
 
     Net sales increased approximately $292,500,000, or approximately 34.8%, as
compared to 1996 (or increased approximately $300,500,000, or approximately
35.7%, excluding the effect of foreign exchange). Net sales increased
principally as a result of the Ply Gem Acquisition on August 26, 1997, which
contributed approximately $284,200,000 to net sales. Excluding sales from the
Ply Gem Acquisition, net sales increased approximately $8,300,000, or 1.0%, as
compared to 1996 (or increased approximately $16,400,000, or approximately 2.0%
excluding the effect of foreign exchange). This increase was principally as a
result of slightly higher sales volume in the Residential Building Products
Group (partially offset by the effects of foreign exchange) and residential
products of the Air Conditioning and Heating Products Group partially offset by
lower sales levels of commercial HVAC products and approximately $3,600,000
lower sales from the sale of a residential HVAC product line in 1997.
 
     Cost of products sold as a percentage of net sales increased from
approximately 71.0% in 1996 to approximately 72.9% in 1997. Excluding the Ply
Gem businesses, (which have a higher level of cost of sales than the overall
group of businesses owned prior to the Ply Gem Acquisition), cost of products
sold as a percentage of net sales decreased from approximately 71.0% to
approximately 70.0% in 1997, as compared to 1996. This decrease in the
percentage principally resulted from a reduction in the cost of certain raw
materials and components compared to 1996 and decreased labor as a percentage of
net sales in the Residential Building Products and Air Conditioning and Heating
Products Groups due to the increased volume of higher margin products and
improved efficiency. Had all year-end inventory values been stated on a FIFO
basis, year-end inventory would have been approximately $5,041,000 higher in
1997, approximately $6,015,000 higher in 1996 and approximately $7,873,000
higher in 1995. Overall, changes in the cost of products sold as a percentage of
net sales for one period as compared to another period may reflect a number of
factors, including changes in the relative mix of products sold, the effect of
changes in sales prices, the material cost of products sold and changes in
productivity levels.
 
     Amortization of acquired goodwill as a percentage of net sales increased
from approximately 0.3% of net sales for the year ended December 31, 1996 to
approximately 0.5% for the year ended December 31, 1997, principally as a result
of the acquisition of Ply Gem.
 
     Selling, general and administrative expense as a percentage of net sales
decreased from approximately 21.4% in 1996 to approximately 19.3% in 1997.
Excluding the Ply Gem businesses (which have a lower level of selling, general
and administrative expense to net sales than the overall group of businesses
owned prior to the acquisition), selling, general and administrative expense as
a percentage of net sales decreased from
 
                                       50
<PAGE>   52
 
approximately 21.4% in 1996 to approximately 21.2% in 1997. This decrease in the
percentage was due principally to higher sales levels in the Residential
Building Products Group without a proportionate increase in expense and the
effect of the sale of a residential HVAC product line noted above, partially
offset by lower sales levels of commercial products by the Air Conditioning and
Heating Products Group without a proportionate decrease in expense.
 
     Segment earnings were approximately $97,000,000 for 1997, as compared to
approximately $74,900,000 for 1996. Segment earnings are operating earnings from
continuing operations before corporate and other expenses that are not directly
attributable to Nortek's product groups. The Ply Gem Acquisition contributed
approximately $11,300,000 to segment earnings. Segment earnings have been
reduced by depreciation and amortization expense of approximately $26,600,000
and approximately $19,500,000 for 1997 and 1996, respectively. The Ply Gem
Acquisition contributed approximately $6,300,000 of the increase in depreciation
and amortization expense in 1997. The overall increase in segment earnings was
due principally, in addition to the effect of the Ply Gem Acquisition, to
increased sales volume without a proportionate increase in expense, particularly
in the Residential Building Products Group and, to a lesser extent, the
residential sector of the Air Conditioning and Heating Products Group and was
affected by the factors previously noted.
 
     Earnings of foreign operations, consisting primarily of the results of
operations of Nortek's Canadian and European subsidiaries, which manufacture
built-in ventilating products, decreased to approximately 10.8% of segment
earnings in 1997 from approximately 11.2% of such earnings in 1996. The decrease
in the percentage is due to an increase in domestic earnings in 1997, in part as
a result of $11,300,000 contributed by Ply Gem, which has primarily domestic
operations. Sales and earnings derived from the international market are subject
to the risks of currency fluctuations.
 
     Operating earnings in 1997 increased approximately $22,000,000, or
approximately 36.1%, as compared to 1996, primarily due to the factors
previously discussed.
 
     Interest expense in 1997 increased approximately $21,800,000 or
approximately 76.8%, as compared to 1996, primarily as a result of the sale of
the 9 1/4% Notes in March 1997, the sale of the 9 1/8% Notes in August 1997 and
the existing indebtedness of Ply Gem. This increase was partially offset by the
refinancing of certain outstanding indebtedness of the Company's subsidiaries
primarily in the second quarter of 1997. See Notes 2 and 5 of the Notes to
Consolidated Financial Statements of the Company included elsewhere herein.
 
     Investment income in 1997 increased approximately $3,900,000, or
approximately 65.0%, as compared to 1996, principally due to higher average
invested balances of short-term investments and marketable securities.
 
     The provision for income taxes was approximately $16,300,000 for 1997, as
compared to approximately $14,900,000 for 1996. The provision for income taxes
was reduced by approximately $1,540,000 in 1997 and $481,000 in 1996 reflecting
the reversal of tax reserves no longer required. The income tax rates differed
from the United States Federal statutory rate of 35% principally as a result of
state income tax provisions, nondeductible amortization expense (for tax
purposes), changes in tax reserves, the effect of foreign income tax on foreign
source income and the effect of product development tax credits from foreign
operations. See Note 4 of the Notes to Consolidated Financial Statements of the
Company included elsewhere herein.
 
     In the fourth quarter of 1997, Nortek adopted a plan to discontinue its
plumbing products business. Loss from discontinued operations related to the
plumbing products business increased approximately $3,500,000 from a loss of
$1,700,000 in 1996 to a loss of $5,200,000 in 1997. Loss from discontinued
operations in 1997 includes a net after tax loss of $1,600,000 for operating
losses expected to occur during the disposal period and is net of an income tax
benefit of $900,000. Loss from discontinued operations includes net after tax
operating losses of $3,600,000 in 1997 and $1,700,000 in 1996 and are net of
income tax benefits of $2,100,000 and $900,000 for 1997 and 1996, respectively.
Operating results of discontinued operations reflect an allocation of corporate
interest expense of approximately $1,900,000 and $1,700,000 in 1997 and 1996,
respectively and are net of income tax benefits of $670,000 and $600,000 in 1997
and 1996, respectively. See Note 9 of the Notes to Consolidated Financial
Statements of the Company included elsewhere herein.
 
                                       51
<PAGE>   53
 
YEAR ENDED DECEMBER 31, 1996 AS COMPARED TO THE YEAR ENDED DECEMBER 31, 1995
 
     Net sales increased approximately $184,800,000, or approximately 28.1%, as
compared to 1995. The Residential Building Products Group net sales increased
principally as a result of fourth quarter 1995 acquisitions, which contributed
approximately $140,400,000 in 1996 as compared to approximately $24,600,000 in
1995. Shipments of new and replacement HVAC products to manufactured housing
customers and increased sales levels of commercial and industrial HVAC products
were the primary reasons for increased sales in the Air Conditioning and Heating
Products Group. Modest sales price increases in certain product lines of the
Residential Building Products Group were also a factor, and were partially
offset by lower sales prices of certain residential HVAC products in the Air
Conditioning and Heating Products Group.
 
     Cost of products sold as a percentage of net sales decreased from
approximately 71.5% in 1995 to approximately 71.0% in 1996. The decrease in the
percentage principally resulted from a reduction in cost in 1996 of certain raw
materials and components compared to 1995 and decreased overhead costs as a
percentage of sales in the Residential Building Products and Air Conditioning
and Heating Products Groups due to increased volume and improved efficiency.
These decreases were partially offset by the 1995 acquisitions of Rangaire, Best
and Venmar, which have a higher level of cost of sales to net sales than the
overall group of businesses owned prior to the acquisitions, the effect of the
development and introduction of new products and the effect of an extended
shut-down period in the third quarter in Europe. Had all year-end inventory
values been stated on a FIFO basis, year-end inventory would have been
approximately $6,015,000 higher in 1996, approximately $7,873,000 higher in 1995
and approximately $4,254,000 higher in 1994.
 
     Amortization of acquired goodwill as a percentage of net sales decreased
from approximately 0.4% of net sales for the year ended December 31, 1995 to
approximately 0.3% for the year ended December 31, 1996, primarily due to the
28.1% increase in net sales in 1996.
 
     Selling, general and administrative expenses as a percentage of net sales
were consistent between years at approximately 21.5% in 1995 and 21.4% in 1996.
The fourth quarter 1995 acquisitions, which have a lower level of selling,
general and administrative expense to net sales than the overall group of
businesses owned prior to the acquisitions, resulted in a decrease in the
percentage which was primarily offset by the effect of limited sales activity
during an extended shut-down period in the third quarter of 1996 by the
Company's European subsidiaries without a proportionate reduction in expense and
higher net unallocated expense.
 
     Segment earnings were approximately $74,900,000 for 1996, as compared to
approximately $50,600,000 for 1995. Fourth quarter 1995 acquisitions, included
in the Residential Building Products Group, contributed approximately $8,400,000
to segment earnings in 1996 as compared to $1,050,000 in 1995. Segment earnings
have been reduced by depreciation and amortization expense of approximately
$19,500,000 and approximately $14,800,000 for 1996 and 1995, respectively.
Acquisitions accounted for approximately $5,100,000 of the depreciation and
amortization expense in 1996 as compared to $750,000 in 1995. The overall
increase in segment earnings was due principally to increased sales volume in
each of Nortek's operating groups, particularly increased sales volume of
residential and commercial HVAC products and residential building products, the
effect of increased sales from the fourth quarter 1995 acquisitions of Rangaire,
Best and Venmar, and a reduction in the price paid for certain materials in each
of Nortek's operating groups and was affected by the factors previously noted.
 
     Foreign segment earnings, consisting primarily of the results of operations
of Nortek's Canadian and European subsidiaries, which manufacture built-in
ventilating products, increased to approximately 11.2% of segment earnings in
1996 from approximately 5.8% of such earnings in 1995. The increase in 1996 was
primarily attributable to an approximate 184.2% increase in foreign segment
earnings in 1996, as compared to a 39.1% increase in domestic earnings. The
increase in 1996 was primarily attributable to earnings of Nortek's 1995
Canadian and European acquisitions.
 
     Operating earnings in 1996 increased approximately $18,000,000, or
approximately 41.9%, as compared to 1995, primarily due to the factors
previously discussed.
 
     Interest expense in 1996 increased approximately $5,400,000, or
approximately 23.5%, as compared to 1995, primarily as a result of higher
borrowings resulting from the 1995 acquisitions of Rangaire, Best and Venmar,
including existing short-term working capital borrowings of the acquired
subsidiaries.
 
                                       52
<PAGE>   54
 
     Investment income in 1996 decreased approximately $2,100,000, or
approximately 25.9%, as compared to 1995, principally due to lower average
invested balances of short-term investments and marketable securities,
principally resulting from the 1995 acquisitions of Rangaire, Best and Venmar
and from purchases of Nortek's capital stock, partially offset by increased cash
from operating results.
 
     The provision for income taxes was approximately $14,900,000 for 1996, as
compared to approximately $10,600,000 for 1995. The provision for income taxes
has been reduced by approximately $481,000 in 1996 and approximately $1,100,000
in 1995, respectively, reflecting the reversal of tax valuation reserves no
longer required, of which approximately $263,000 in 1996 and $670,000 in 1995
are as a result of the gain on the sale of certain investments and marketable
securities. The income tax rates differed from the United States Federal
statutory rate of 35% principally as a result of state income tax provisions,
nondeductible amortization expense (for tax purposes), the changes in tax
reserves, the effect of foreign income tax on foreign source income, and in 1996
from the effect of product development tax credits from foreign operations. See
Note 4 of the Notes to Consolidated Financial Statements of the Company included
elsewhere herein.
 
     Loss from discontinued operations related to the plumbing products business
decreased approximately $800,000 from a loss of $2,500,000 in 1995 to a loss of
$1,700,000 in 1996. Loss from discontinued operations includes a net after tax
operating loss of $1,700,000 in 1996 and $2,500,000 in 1995 and is net of tax
benefits of $900,000 and $1,300,000 for 1996 and 1995, respectively. Operating
results of discontinued operations reflect an allocation of corporate interest
expense of approximately $1,700,000 and $1,900,000 in 1996 and 1995,
respectively, and are net of a tax benefit of $600,000 and $670,000 in 1996 and
1995, respectively. See Note 9 of the Notes to Consolidated Financial Statements
of the Company included elsewhere herein.
 
LIQUIDITY AND CAPITAL RESOURCES
 
     The Company is highly leveraged and expects to continue to be highly
leveraged for the foreseeable future. At October 3, 1998, on a pro forma basis,
after giving effect to the acquisition of Napco, the Company had consolidated
debt of approximately $1,037.1 million, consisting of (i) $17.2 million of
short-term borrowings and current maturities of long-term debt, (ii) $122.1
million of notes, mortgage notes and other indebtedness, (iii) $209.3 million of
the Original Notes, (iv) $174.1 million of the 9 1/4% Notes, (v) $206.7 million
of the 9 7/8% Notes and (vi) $307.7 million of the 9 1/8% Notes. See
"Capitalization." On a pro forma basis, the Company had consolidated
unrestricted cash, cash equivalents and marketable securities of approximately
$124.3 million. On a pro forma basis, the Company's debt to equity ratio was
approximately 4.89:1 at October 3, 1998 as compared to 6.66:1 at December 31,
1997 on a historical basis. The Company's ability to pay interest on or to
refinance its indebtedness depends on the successful integration of the
operations of recent acquisitions and the Company's future performance, which,
in part, is subject to general economic, financial, competitive, legislative,
regulatory and other factors beyond its control. There can be no assurance that
the Company will generate sufficient cash flow from the operation of its
subsidiaries or that future financings will be available on acceptable terms or
in amounts sufficient to enable the Company to service or refinance its
indebtedness, or to make necessary capital expenditures. See "Risk Factors --
Substantial Leverage."
 
   
     The Company has evaluated and expects to continue to evaluate possible
acquisition transactions and the possible dispositions of certain of its
businesses on an ongoing basis and at any given time may be engaged in
discussions or negotiations with respect to possible acquisitions or
dispositions. The Company does not expect the possible disposition of businesses
being evaluated to have a material adverse effect on its financial position. See
Notes 15(K) and (L) of the Notes to Consolidated Financial Statements included
elsewhere herein.
    
 
     The indentures and other agreements governing the Company's and its
subsidiaries indebtedness (including the Indenture, the indentures for the
9 7/8% Notes, the 9 1/4% Notes and the 9 1/8% Notes and the credit agreement for
the Ply Gem Credit Facility) contain restrictive financial and operating
covenants, including covenants that restrict the ability of the Company and its
subsidiaries to complete acquisitions, pay dividends, incur indebtedness, make
investments, sell assets and take certain other corporate actions. See
"Description of Notes" and "Description of Other Obligations."
 
                                       53
<PAGE>   55
 
     The Company expects to meet its cash flow requirements through fiscal 1999
from cash generated from operations, existing cash, cash equivalents and
marketable securities, the sale of assets and possible financings, which may
include securitization of accounts receivables and mortgage or capital lease
financings.
 
     In the first nine months of 1998 the Company improved its liquidity and
reduced its leverage from the sale of 2,182,500 shares of Common Stock for net
proceeds of approximately $64.3 million and net proceeds of approximately $68.9
million from the sale of certain businesses. Approximately $44.8 million of the
proceeds received from the sale of Common Stock was used for the acquisition of
NuTone, and $20.0 million of the net proceeds received from the sale of
businesses in the first nine months of 1998 was used to reduce debt. On December
10, 1998 the Company sold Allied and received cash proceeds of approximately
$16.5 million of which $7.7 was used to pay down debt. See Notes 15(C), (E) and
(K) of the Notes to Consolidated Financial Statements.
 
     On October 9, 1998, the Company, through a wholly-owned subsidiary,
purchased all of the issued and outstanding capital stock of Napco for
approximately $81.2 million in cash plus the assumption of approximately $10.2
million of debt. The acquisition was funded through the use of unrestricted
cash, cash equivalents and marketable securities.
 
     On July 31, 1998, the Company, through a wholly-owned subsidiary, purchased
all of the issued and outstanding capital stock of NuTone from Williams, for an
aggregate purchase price of $242.5 million. In connection with the acquisition,
the Company assumed NuTone's operating liabilities (other than intercompany
borrowings), including certain liabilities of NuTone concerning post retirement
and other benefit obligations. The purchase price was funded from the net
proceeds from the sale of the Original Notes which occurred on July 31, 1998
together with a portion of the cash proceeds from the Common Stock Offering. See
Note 15(E) of the Notes to Consolidated Financial Statements included elsewhere
herein.
 
     As the Company begins the process of integrating Nutone into its
businesses, it expects to achieve significant synergies, cost savings and
reductions during 1999, partially offset by certain costs and expenses. The
total expenditures associated with this effort are expected to be funded from
the Company's 1999 operating cash flow. If significant difficulty is encountered
during the integration process, if NuTone is not rapidly integrated or if such
synergies and cost savings are not realized, the results of operations, cash
flow and financial condition of the Company likely will be adversely affected.
There can be no assurance that the Company will be able to successfully manage
and integrate NuTone following the Acquisition.
 
     Unrestricted cash and cash equivalents decreased from approximately $125.8
million at December 31, 1997 to approximately $99.2 million at October 3, 1998.
Marketable securities available for sale increased from approximately $36.0
million at December 31, 1997 to approximately $102.2 million at October 3, 1998.
The Company's investment in marketable securities at October 3, 1998 consisted
primarily of investments in bank issued money market instruments and commercial
paper. At October 3, 1998, approximately $6.4 million of the Company's cash and
investments were pledged as collateral for insurance and other requirements and
were classified as restricted in current assets in the Company's accompanying
consolidated balance sheet.
 
     Capital expenditures were approximately $22.5 million in 1997 and are
expected to be approximately $40.0 million in 1998.
 
     The Company's Board of Directors has authorized a program to purchase up to
500,000 shares of the Company's Common and Special Common Stock in open-market
or negotiated transactions subject to market conditions, cash availability and
provisions of the Company's outstanding debt instruments. As of November 6,
1998, the Company had purchased approximately 356,400 shares of its Common and
Special Common Stock under this program for approximately $10.2 million and
accounted for such share purchases as Treasury Stock.
 
     At November 6, 1998, approximately $61.1 million was available for the
payment of cash dividends, stock payments or other restricted payments as
defined under the terms of the Company's most restrictive indenture. See Note
15(F) of the Notes to Consolidated Financial Statements included elsewhere
herein.
 
                                       54
<PAGE>   56
 
     The Company's working capital increased and its current ratio decreased
slightly from approximately $341.8 million and 2.25:1, respectively, to
approximately $382.3 million and 2.21:1, respectively, between December 31, 1997
and October 3, 1998, principally as a result of the acquisition of NuTone, the
net proceeds from the Common Stock Offering (net of funds used to acquire
NuTone) and the sale of the plumbing products business, partially offset by the
effect of the sale of other businesses. NuTone contributed approximately $62.6
million of current assets and approximately $36.2 million of current liabilities
to the net increase in working capital at October 3, 1998.
 
     The Company's debt-to-equity ratio decreased from approximately 6.66:1 at
December 31, 1997 to 4.84:1 at October 3, 1998, primarily as a result of the
Common Stock Offering, net earnings for the first nine months ended October 3,
1998 and the net decrease in borrowings, partially offset by the effect of the
sale of the Original Notes. See the Unaudited Condensed Consolidated Statement
of Stockholders' Investment for the nine months ended October 3, 1998 included
elsewhere therein.
 
     At December 31, 1997, the Company had approximately $60.8 million of net
U.S. federal prepaid income tax assets which are expected to be realized through
future operating earnings.
 
INFLATION, TRENDS AND GENERAL CONSIDERATIONS
 
     The Company has evaluated and expects to continue to evaluate possible
acquisition transactions and the possible dispositions of certain of its
businesses on an ongoing basis and at any given time may be engaged in
discussions or negotiations with respect to possible acquisitions or
dispositions. See "Recent Developments."
 
     The Company's performance is dependent to a significant extent upon the
levels of new residential construction, residential replacement and remodeling
and non-residential construction, all of which are affected by such factors as
interest rates, inflation and unemployment. In the near term, the Company
expects to operate in an environment of relatively stable levels of construction
and remodeling activity. However, increases in interest rates could have a
negative impact on the level of housing construction and remodeling activity.
 
     The demand for the Company's products is seasonal, particularly in the
Northeast and Midwest regions of the United States where inclement weather
during the winter months usually reduces the level of building and remodeling
activity in both the home improvement and new construction markets. The
Company's lower sales levels usually occur during the first and fourth quarters.
Since a high percentage of the Company's manufacturing overhead and operating
expenses are relatively fixed throughout the year, operating income and net
earnings tend to be lower in quarters with lower sales levels. The Ply Gem
businesses, acquired in August 1997, have in the past been more seasonal in
nature than the Company's businesses owned prior to the Ply Gem Acquisition. In
addition, the demand for cash to fund the working capital of the Company's
subsidiaries is greater from late in the first quarter until early in the fourth
quarter.
 
YEAR 2000 DISCLOSURE
 
     The Year 2000 ("Y2K") issue refers to and arises from deficient computer
programs and related products, such as embedded chips, which do not properly
recognize or process a year that begins with "20" instead of "19". If not
corrected, many businesses and other processes could fail or create erroneous
results. The extent of the potential impact of the Y2K problem is not yet known,
and if not timely corrected, it could affect the global economy. As required by
recent guidance from the SEC applicable to all public companies, the following
disclosure provides more detail regarding the Company's Y2K compliance than
previous reports filed by the Company.
 
A.  THE COMPANY'S READINESS:
 
     To manage its Y2K program, the Company established a corporate-wide
initiative and has divided its efforts into five areas: awareness (communication
to employees, vendors and suppliers of the Y2K issue), assessment (a complete
inventory of all aspects of the business that might be affected), remediation/
validation (develop plans to correct all issues identified from the assessment
stage), implementation (corrective measures taken to solve the Y2K issues
identified) and contingency (alternative actions developed
 
                                       55
<PAGE>   57
 
in the event that all corrective measures are not implemented by Y2K). Further,
the Company has identified three key areas of concentration: information
technology systems, non-IT systems and third parties (suppliers and customers).
The Company's subsidiaries are in various stages of completion of this
readiness, including the assessment, remediation and implementation stages, for
the Y2K issue. Certain of the Company's subsidiaries are simultaneously working
on the assessment, remediation and implementation stages of this initiative.
During the next two fiscal quarters, the Company's subsidiaries expect to make
significant progress in the remediation and implementation stages. Overall the
Company believes that it is in the assessment stage of addressing the Y2K issue
and expects by the end of its next fiscal quarter to provide a more definitive
assessment of the status of each stage. Although the Company believes that all
modifications to information technology ("IT") and non-IT systems material to
the Company's business will be Y2K compliant on or before December 31, 1999, it
cannot predict the outcome or the success of its Y2K program, or that third
party systems are or will be Y2K compliant, or that the costs required to
address the Y2K initiative, or that the impact of a failure to achieve
substantial Y2K compliance, will not have a material adverse effect on the
Company's business, financial condition or results of operations.
 
     1.  Information Technology (IT) systems: The Company is conducting a
         comprehensive review of its computer systems to identify those that
         could be affected by the Y2K issue. The Company's operating systems and
         database systems are not all Y2K compliant. The Company presently
         believes that with minor modifications (conversion and testing in
         progress) to existing software and replacement of others, the Y2K
         problem will not pose significant operational problems for the
         Company's computer systems as so modified.
 
     2.  Non-IT systems: Non-IT systems are those that typically include
         "embedded" technology such as microcontrollers and chips. The Company
         currently is in the process of evaluating the effect of the Y2K problem
         on all non-IT systems including all telecommunications equipment,
         shop-floor controls, alarm systems and any other equipment that can
         potentially use microcontrollers, chips or other systems affected by
         the Y2K problem.
 
     3.  Third parties: Due to the pervasive use of computers by the Company in
         its dealings with suppliers, customers, financial institutions, and
         other third parties, the Y2K problem could have a material impact on
         the Company if not timely addressed by such third parties. To assess
         third party readiness, the Company is surveying its principal suppliers
         and financial institutions and receiving responses that indicate that
         such parties are in the process of adequately addressing the problem.
         In cases where key suppliers have not responded or are not adequately
         addressing the issue, the Company will determine what contingency plans
         will be necessary to protect the Company's interests. While the Company
         has not surveyed all its customers, it has received surveys from many
         of its principal customers that indicate that they are also addressing
         the problem.
 
   
     The Company operates in a decentralized environment and major computer
systems are, therefore, in various states of readiness. Six businesses supported
approximately 73% of the Company's net sales for the first nine months of 1998
after excluding net sales of businesses sold in 1998. Of these six businesses,
the Company estimates that the remediation effort for IT systems Y2K issues of
one business unit representing approximately 23% of net sales for the first nine
months of 1998 after businesses sold is approximately 95% complete. The Company
estimates that the remediation effort for the IT systems Y2K issues of three
business units representing approximately 21% of net sales for the first nine
months of 1998 after businesses sold is approximately 75% complete. The Company
estimates that the remediation effort for the IT systems Y2K issues of two
business units representing approximately 29% of net sales for the first nine
months of 1998 after businesses sold is approximately 50% complete.
    
 
   
     Substantially all of the non-IT systems, including telephone systems and
office equipment, have been tested. Those found not to be Y2K compliant are in
the process of being replaced or repaired. Machinery and equipment testing and
remediation are in process and the Company estimates this phase to be
approximately 10% complete overall.
    
 
                                       56
<PAGE>   58
 
B.  COST:
 
   
     The Company's current estimate for remediation directly related to fixing
Y2K issues is approximately $5,400,000. The total estimated expenditures of
approximately $5,400,000 consists of approximately $1,900,000 of IT computer
hardware equipment costs, approximately $2,500,000 of IT software and non-IT
computer hardware expenditures and approximately $1,000,000 of other non-IT
expenditures. The Company has spent approximately $2,000,000 through October 3,
1998. All of the Company's Y2K compliance expenditures have been or are expected
to be funded from the Company's operating cash flow.
    
 
   
     The Company's Y2K compliance budget does not include significant amounts
for hardware replacement because the Company has historically employed a
strategy to continually upgrade its computer systems. Consequently, the
Company's Y2K compliance budget has not required the diversion of funds from or
the postponement of the implementation of other planned IT projects.
    
 
   
     Actual costs to be incurred by the Company will depend on a number of
factors which cannot be accurately predicted and may therefore deviate from the
estimates above including, among others, the extent and difficulty of the
remaining remediation and other work to be done, the availability and cost of
consultants, and the extent of testing required to demonstrate Y2K compliance.
    
 
C.  RISKS:
 
     Based on current information, the Company believes that the Y2K problem
will not have a material adverse effect on the Company, its business or its
financial condition. There can, however, be no assurances that Y2K remediation
by the Company or third parties will be properly and timely completed, and
failure to do so could have a material adverse effect on the Company, its
business and its financial condition. The Company believes that the greatest
risk presented by the Y2K problem is from third parties, such as suppliers,
financial institutions, utility providers, etc. who may not have adequately
addressed the problem. A failure of any such third party's computer or other
applicable systems in sufficient magnitude could materially and adversely affect
the Company. The Company is not presently able to quantify this risk.
 
   
     The Company is unable to assess a reasonable worst case Y2K scenario given
a number of factors outside of the Company's direct or indirect control,
including among others, the Company's current evaluation and assessment status
and the uncertainty of the readiness of vendors and customers. The Company
recognizes the risks in its ability to conduct business if other key suppliers
in utilities, communications, transportation, banking and government, both
domestic (local, state and federal) and foreign, are not Y2K ready. The Company
is in the process of surveying vendors and customers about their readiness. Upon
completion of this survey, the Company will complete its own internal review of
this information to verify the accuracy of the responses. The Company is
monitoring news and progress reports pertaining to those critical services to
determine the effect on the Company's ability to conduct business as a result of
Y2K issues on the economy if those and other key suppliers in utilities,
communications, transportation, banking and government, both domestic (local,
state and federal) and foreign, cease to function. Once the Company has
completed its assessment and remediation phases of the Y2K issue, the Company
will develop appropriate worst-case scenarios and plans to deal with such
contingencies while it develops its contingency plans which are expected to be
completed in mid 1999.
    
 
D.  CONTINGENCY PLANS:
 
     The Company is in the process of preparing appropriate contingency plans in
the event that a significant internal or external exposure is identified. While
the Company is not presently aware of any such significant exposure, there can
be no guarantee that the systems of third parties on which the Company relies
will be converted in a timely manner, or that a failure to properly convert by
another company would not have a material adverse effect on the Company.
 
   
     The Company's contingency plans for IT systems have not been completely
developed, but are expected to be complete by mid 1999. The Company expects to
complete the preparation of its contingency plans once it evaluates its status
after it has completed the evaluation and remediation phases of the Y2K project
for IT systems. In planning for issues not resolved or contemplated for IT
systems, the Company plans to allocate
    
 
                                       57
<PAGE>   59
 
   
internal resources and may retain dedicated consultants and vendor
representatives to be available to take corrective action, if necessary.
However, the Company will adjust and adopt additional plans if situations arise
requiring modifications to existing contingency plans or new contingency plans,
as required.
    
 
   
     The Company's contingency plans for non-IT systems have also not been
completed. The Company will develop, if necessary, appropriate contingency plans
by mid 1999 upon completion of its assessment and remediation efforts in this
area.
    
 
     Readers are cautioned that Y2K forward looking statements should be read in
conjunction with the Company's disclosure in "Risk Factors."
 
                                       58
<PAGE>   60
 
                                    BUSINESS
 
GENERAL
 
     The Company is a diversified manufacturer of residential and commercial
building products, operating within four principal product groups: the
Residential Building Products Group; the Air Conditioning and Heating Products
Group; the Windows, Doors and Siding Group; and the Specialty Products and
Distribution Group. Through these product groups, the Company manufactures and
sells, primarily in the United States, Canada and Europe, a wide variety of
products for the residential and commercial construction, manufactured housing
and the DIY and professional remodeling and renovation markets.
 
     The Company's management team, led by Chief Executive Officer Richard L.
Bready since the end of 1990, has successfully implemented a strategy of
internal growth and growth through acquisitions while selectively divesting
non-core and underperforming businesses. The focus of this strategy has been to
target higher growth, less cyclical segments of the building products industry,
including the general repair and renovation market, the manufactured housing
market and the vinyl windows and siding market. In August 1997, the Company
completed its largest acquisition when it acquired Ply Gem, a leading
manufacturer of windows, doors and siding products. The acquisition of NuTone, a
leading manufacturer and supplier of built-in electrical appliances, constitutes
the second largest acquisition of the Company and the fifth acquisition since
the beginning of 1995.
 
   
     During the nine months ended October 3, 1998, the Company sold its plumbing
products business as well as several non-core businesses acquired as part of the
Ply Gem Acquisition. The Company sold Allied on December 10, 1998 and M&S and
MOM on December 30, 1998. In addition, on October 9, 1998, the Company acquired
Napco. The Company has evaluated and expects to continue to evaluate possible
acquisition transactions and the possible dispositions of certain of its
businesses on an ongoing basis and at any given time may be engaged in
discussions or negotiations with respect to possible acquisitions or
dispositions. See "Recent Developments."
    
 
ACQUISITION RATIONALE
 
     Furthering its strategy of building on the strengths of its core
businesses, Nortek acquired NuTone in July 1998. Through the Acquisition, Nortek
expects to increase its sales of several of its core built-in home ventilation
product lines including exhaust fans and range hoods. The Company expects the
integration of NuTone to create important synergies and cost reductions in
several areas, including distribution, sales, manufacturing, purchasing and
product development.
 
     The Company currently estimates that it can achieve approximately $16.7
million in annualized cost reductions from year ended December 31, 1997 levels
related to the Acquisition within 12 to 18 months following the consummation of
the Acquisition. The magnitude and timing of these cost reductions represent
estimates and actual savings could differ materially. See "Unaudited Pro Forma
Condensed Consolidated Financial Data."
 
BUSINESS STRATEGY
 
     The Company seeks to realize consistent, profitable growth principally by:
(i) developing and maintaining leadership positions in market segments which the
Company believes are growing at rates in excess of the overall building products
industry; (ii) opportunistically expanding its product portfolio to achieve
synergies in marketing, distribution and manufacturing; (iii) increasing its
presence in the less cyclical replacement and retrofit market; (iv) operating as
a low cost producer to maintain a competitive advantage; and (v) successfully
completing and integrating strategic acquisitions.
 
     Target High Growth Market Segments.  The Company targets those segments of
the building products industry that it believes are experiencing more rapid
growth than the overall building products industry. These targeted segments
include: (i) the general repair and renovation market, which continues to
benefit from the increasing age and size of the U.S. housing stock and the
proliferation of home center chains; (ii) the manufactured housing market, which
has represented an increasing proportion of new housing starts over the past
five years; and (iii) the vinyl windows and siding market, which has cost and
performance characteristics
 
                                       59
<PAGE>   61
 
that have resulted in substantially increased penetration of such products
within the new home and retrofit markets. By increasing its presence in these
market segments, the Company seeks to achieve rates of growth in excess of the
overall building products industry. For example, net sales of the Company's Air
Conditioning and Heating Products Group have grown at an internal compounded
annual growth rate of approximately 12.1% for the five year period ended
December 31, 1997, reflecting increasing demand for replacement products as the
installed base of HVAC systems in the United States has grown.
 
     Achieve Marketing, Distribution and Manufacturing Synergies.  The Company
pursues increased penetration of distribution channels such as home centers and
manufactured home builders which it believes present cross-marketing
opportunities for the Company's expanding portfolio of products. For example,
the recent Ply Gem Acquisition provides the opportunity to market Ply Gem's
vinyl products to the manufactured housing market, in which the Company's HVAC
products maintain a leading position. Similarly, the Company is leveraging Ply
Gem's position as one of the largest suppliers of vinyl siding and wood windows
to home centers to increase the Company's sales of residential building
products. Most recently, the Company entered into agreements to license several
well-known consumer brand names, including Frigidaire(R), Tappan(R), Philco(R)
and Gibson(R), which the Company believes have been well-received by HVAC
residential distributors. The Company also seeks to achieve synergies in
manufacturing and logistics by rationalizing its production processes. For
example, the Company transferred the manufacture of certain "Eurostyle" range
hood products sold into the North American markets from the facilities of Best
in Italy to Venmar's lower-cost Canadian facilities and also centralized
production of its indoor-air-quality products into the same facilities.
 
     Increase Presence in Less Cyclical Replacement and Retrofit Market.  The
Company seeks to increase its presence in the replacement and retrofit market
and lessen its dependence on the new construction segment of the building
products industry, which is more sensitive to economic cycles. For example, the
acquisition of Ply Gem, which is a leading supplier of windows to the
replacement market, increased the Company's presence in the replacement and
retrofit market. Other businesses of the Company which maintain a significant
presence in the replacement and retrofit market include the Company's HVAC and
ventilation businesses.
 
     Operate as a Low Cost Producer.  The Company employs a combination of
rigorous production controls, advanced manufacturing systems, capital investment
and quality management systems to seek to achieve consistently low cost
operations. To promote cost efficient operations, the Company also centralizes
certain of its overhead functions, including its risk management, tax reporting
and legal functions, and coordinates certain activities of its subsidiaries'
operations, such as purchasing and transportation.
 
     Complete and Integrate Strategic Acquisitions.  The Company has
demonstrated an ability to integrate successfully acquired businesses. In 1995,
the Company acquired Best, Rangaire and Venmar. Since that time, the Company has
taken numerous actions to integrate these acquisitions into its Residential
Building Products Group, including elimination of corporate redundancies,
rationalization of multiple sales forces and a general reorganization of product
line responsibilities related to its "Eurostyle" range hood and indoor-air-
quality products as described above. Partially as a result of these actions,
operating earnings within the Residential Building Products Group have increased
as a percentage of net sales from 7.9% in 1995 to 10.5% in 1997.
 
     Since acquiring Ply Gem in August 1997, the Company has eliminated expenses
associated with Ply Gem's corporate headquarters, consolidated certain corporate
functions such as accounting, legal, tax, risk management and eliminated certain
underperforming product lines. These actions have resulted in estimated
annualized cost reductions of approximately $24.0 million. In addition, the
Company continues to identify and rationalize underperforming businesses. During
1998 the Company sold several non-core businesses acquired through the PlyGem
Acquisition and is evaluating the sale of certain other non-core businesses.
 
THE MARKET FOR BUILDING PRODUCTS
 
     The Industry Overview.  The building products industry consists of a large
number of companies that manufacture materials and equipment used primarily in
two end markets: (i) the repair, renovation and remodeling market and (ii) the
new construction market. Both of these end markets are further subdivided into
residential and non-residential categories. According to the United States
Bureau of the Census (the "US
 
                                       60
<PAGE>   62
 
Census Bureau"), private construction of residential and non-residential
buildings totaled approximately $422.0 billion in 1997.
 
     The most important factors influencing demand for building products include
both the levels of residential and commercial new construction activity and the
levels of repair and remodeling activity. Demand for residential building
products is principally affected by the number of housing starts, the rate of
existing home sales and the age and size of the U.S. housing stock. The level of
remodeling activity tends to be closely related to the rate of existing home
sales and the age and size of such homes. The Company has strong relationships
with large retail home centers which are expected to benefit from continuing
growth of the DIY and home improvement markets.
 
     Renovation and Remodeling.  The Company's strategy is to increase sales
derived from consumer spending associated with renovation and remodeling
activities for both residential and non-residential buildings and structures.
The Company believes that the frequency of renovating and remodeling activities
increases with the age of a home and that such activities also often occur
shortly before and after an existing home sale. Between 1987 and 1997, according
to the National Association of Realtors, sales of existing homes increased by
24%, from 3.4 million to 4.2 million. According to the National Association of
Homebuilders (the "NAH"), the average age of a U.S. home has increased from 23
years in 1985 to 28 years in 1995. Another factor driving increased demand for
building products has been an increase in the average size of homes built in the
United States. In 1997, according to the NAH, the average single-family home
contained 1,975 square feet of space, as compared to 1,385 square feet in 1970
and 1,595 square feet in 1980. Additionally, the rapid expansion of building
product retail chains have made building products more accessible to
"do-it-yourselfers," contributing to the overall growth in the renovation and
remodeling markets. Correspondingly, between 1987 and 1997, according to the US
Census Bureau, expenditures on home improvements increased from $55.9 billion to
$79.9 billion, or 43%. The Company also believes that the existing home market
experiences less cyclicality than the new home market.
 
     Residential New Construction.  This category includes spending associated
with the construction of both single-family and multi-family residences.
Building activity in the residential construction market is often measured in
terms of housing starts, which vary with job growth, population growth and other
demographic trends, as well as the state of the economy and interest rates.
According to the US Census Bureau, housing starts in 1997 totaled 1,474,000
units, consisting of 1,133,700 single family units and 340,300 multi-family
units. Since 1985, single family housing starts have exceeded one million units
in all but two years (1990 and 1991). Manufactured housing shipments have
increased from approximately 170,000 in 1991 to over 354,000 in 1997. The sector
generally is growing faster than the overall market for new housing,
representing 24% of the total single family housing starts in 1997, as compared
to 17% in 1991. According to the US Census Bureau, total spending for new single
family housing units in 1997 totaled approximately $162.7 billion, representing
a 42% increase over 1987 levels.
 
     Non-Residential Construction.  This category includes spending associated
with the construction of new buildings and structures for the commercial,
industrial, government and infrastructure markets. According to the US Census
Bureau, expenditures for non-residential building construction between 1987 and
1997 increased from $123.2 billion to $161.2 billion, or approximately 31%.
 
NORTEK
 
Residential Building Products Group
 
     The Residential Building Products Group manufactures and distributes
built-in products primarily for the residential new construction, DIY and
professional remodeling and renovation markets. The principal products sold by
the Group are kitchen range hoods, bath fans, combination units (fan, heater and
light combinations), shower doors and bath cabinets including products
manufactured and sold by NuTone. See "Business -- NuTone". The Group is the
largest supplier in North America of range hoods, bath fans and combination
units, indoor air quality products (such as continuous-ventilation systems and
energy- recovery ventilators) and one of the leading suppliers in Western
Europe, South America and the Middle East of luxury "Eurostyle" range hoods.
Products are sold under the Broan(R), Nautilus(R), Venmar(R), Flair, vanEE(R),
Rangaire(R)
 
                                       61
<PAGE>   63
 
   
and Best(R) brand names, among others, to distributors and dealers of electrical
and lighting products, kitchen and bath dealers, retail home centers and
original equipment manufacturers ("OEMs"). Customers for the Group's products
include residential and electrical contractors, professional remodelers and DIY
homeowners. Other products sold by this Group include, among others, wireless
security products, built-in home intercoms, door chimes, paddle fans, central
vacuum systems and fluorescent lighting fixtures. The Company's sales of kitchen
range hoods accounted for approximately 14.8% of the Company's consolidated net
sales in 1997.
    
 
     The Company expects the Acquisition to strengthen the Group's market
position. See "The Acquisition." NuTone has two principal product groups:
Ventilation Products, and Bath/Electronics/Specialty Products. Ventilation
Products consists of products that improve home indoor air quality, including
intercoms, audio speakers, door chimes, central vacuum cleaners and bath
cabinets and accessories. All of NuTone's products are marketed under the widely
recognized NuTone(R) brand name.
 
     A key component of the Group's operating strategy is the introduction of
new products which capitalize on the strong Broan(R), Nautilus(R), Venmar(R),
Flair, vanEE(R), Rangaire(R) and Best(R) brand names and the extensive
distribution system of the Group's businesses. Products sold under these brand
names include the Broan Rangemaster and Finesse(TM) rangehood, Solitaire and
Solitare Ultra Silent fans and fan lights, the Best by Broan(R), "Eurostyle"
luxury rangehoods, the Venmar(R), Flair and vanEE(R) Super Compact line of
indoor air quality systems and the Broan(R) 12" wide trash compactor. As a
result of the Acquisition, the Company also markets under the NuTone(R) brand
name.
 
     With respect to certain product lines, several private label customers
account for a substantial portion of net sales. In 1997, approximately 20.2% of
the total sales of the Group were made to private label customers.
 
     Production generally consists of fabrication from coil and sheet steel and
formed metal utilizing stamping, pressing and welding methods, assembly with
components and subassemblies purchased from outside sources (motors, fan blades,
heating elements, wiring harnesses, controlling devices, glass, mirrors,
lighting fixtures, lumber, wood and polyethylene components, speakers, grilles
and similar electronic components, and compact disc and tape player mechanisms)
and painting, finishing and packaging.
 
     The Group offers a broad array of products with various features and styles
across a range of price points. The Company believes that the Group's variety of
product offerings helps the Group maintain and improve its market position for
its principal products. At the same time, the Company believes that the Group's
status as a low-cost producer, in large part as a result of advanced
manufacturing processes, provides the Group with a competitive advantage.
 
     The Group's primary products compete with many domestic and international
suppliers in their various markets. The Group competes with suppliers of
competitive products primarily on the basis of quality, distribution, delivery
and price. The market for bath cabinets is highly fragmented with no single
dominant supplier. Although the Group believes it competes favorably among
suppliers of the Group's products, certain of these suppliers have greater
financial and marketing resources than the Group.
 
   
     The Group had 19 manufacturing plants and had 3,064 full-time employees as
of December 31, 1998, 667 of whom were covered by collective bargaining
agreements which expire in 1999, 2000 and 2001.
    
 
Air Conditioning and Heating Products Group
 
     The Air Conditioning and Heating Products Group manufactures and sells HVAC
systems for custom-designed commercial applications and for manufactured and
site-built residential housing. The Group's commercial products consist of HVAC
systems that are custom-designed to meet customer specifications for commercial
offices, manufacturing and educational facilities, hospitals, retail stores and
governmental buildings. Such systems are primarily designed to operate on
building rooftops (including large self-contained walk-in units) or on
individual floors within a building, and range from 40 to 600 tons of cooling
capacity. The Group markets its commercial products under the Governair(R),
Mammoth(R), Temtrol(R), Aston and Venmar(R) brand names. For manufactured and
site built residential housing, the Group's products include central air
conditioners, heat pumps, furnaces and a wide range of accessories marketed
under the Intertherm(R), Miller(R),
 
                                       62
<PAGE>   64
 
and POWERmiser(R) brand names for certain of its products. The Group has
recently licensed the use of the Frigidaire(R), Tappan(R), Philco(R) and
Gibson(R) brand names. Residential central air conditioning products range from
1.5 to 5 tons of cooling capacity and furnaces range from 45,000 BTUs to 144,000
BTUs of heating capacity.
 
     Commercial HVAC Products.  The Group's commercial products include packaged
rooftop units and air handlers, custom walk-in mechanical equipment rooms,
individual floor by floor units, heat pumps and heat recovery equipment. The
market for commercial HVAC equipment is segmented between standard and
custom-designed equipment. Standard equipment can be manufactured at a lower
cost and therefore offered at substantially lower initial prices than
custom-designed equipment. As a result, suppliers of standard equipment
generally have a larger share of the overall commercial HVAC market than
suppliers of custom-designed equipment, including the Group. However, because of
certain building designs, shapes or other characteristics, the Company believes
there are many applications for which custom-designed equipment is required or
is more cost effective over the life of the building. Unlike standard equipment,
the Group's commercial HVAC equipment can be designed to match the exact space,
capacity and performance requirements of the customer. The Group sells its
commercial products primarily to contractors, owners and developers of
commercial office buildings, manufacturing and educational facilities,
hospitals, retail stores and governmental buildings. The Group seeks to maintain
strong relationships nationwide with design engineers, owners and developers,
the persons who are most likely to value the benefits and long-term cost
efficiencies of the Group's custom-designed equipment.
 
     The Company estimates that about half of the Group's commercial sales in
1997 were attributable to replacement and retrofit activity, which typically is
less cyclical than new construction activity and generally commands higher
margins. The Group continues to develop product and marketing programs to
increase penetration in the growing replacement and retrofit market.
 
     For many commercial applications, the ability to provide a custom-designed
system is the principal concern of the customer. The Group's packaged rooftop
and self-contained walk-in equipment rooms maximize a building's rentable floor
space because they are located outside the building. In addition, factors
relating to the manner of construction and timing of installation of commercial
HVAC equipment can often favor custom-designed rather than standard systems. As
compared with site-built and standard HVAC systems, the Group's systems are
factory assembled and then installed, rather than assembled on site, permitting
extensive testing prior to shipment. As a result, the Group's commercial systems
can be installed later in the construction process than site-built systems,
thereby saving the owner or developer construction and labor costs. The Group's
individual floor units offer flexibility in metering and billing, a substantial
advantage if a building is to be occupied in stages or where HVAC usage varies
significantly from floor to floor.
 
     The Group's commercial products are marketed through independently-owned
manufacturers' representatives and an in-house sales, marketing and engineering
group of 110 persons as of December 31, 1997. The independent representatives
are typically HVAC engineers, a factor which is significant in marketing the
Group's commercial products because of the design-intensive nature of the market
segment in which the Group competes.
 
     The Company believes that the Group is among the largest suppliers of
custom-designed commercial HVAC products in the United States. The Group's three
largest competitors in the commercial HVAC market are York International
Corporation (which sells under the "Pace" trade name) and its Miller-Picking
division, McQuay International (a subsidiary of OYL Corporation), and The Trane
Company (a subsidiary of American Standard Inc.). The Group competes primarily
on the basis of engineering support, quality, flexibility in design and
construction and total installed system cost. Although the Company believes that
the Group competes favorably with respect to certain of these factors, most of
the Group's competitors have greater financial and marketing resources than the
Group and enjoy greater brand awareness. However, the Company believes that the
Group's ability to produce equipment that meets the performance characteristics
required by the particular product application provides it with advantages not
enjoyed by certain of these competitors.
 
                                       63
<PAGE>   65
 
     Residential HVAC Products.  The Group is one of the largest suppliers of
air conditioners, heat pumps and furnaces to the manufactured housing market in
the United States. In addition, the Group manufactures and markets HVAC and
light commercial products for site-built homes and light commercial structures.
 
     The principal factors affecting the market for the Group's residential HVAC
products are the levels of manufactured housing shipments and housing starts and
the demand for replacements and modernization of existing equipment. The Company
anticipates that the replacement market will continue to expand as a large
number of previously installed heating and cooling products become outdated or
reach the end of their useful lives. This growth may be accelerated by a
tendency among consumers to replace older heating and cooling products with
higher efficiency models prior to the end of such equipment's useful life. The
market for residential cooling products, including those sold by the Group, is
affected by spring and summer temperatures. The Group does not sell window air
conditioners, a segment of the market which is highly seasonal and especially
affected by spring and summer temperatures. The Company believes that the
Group's ability to offer both heating and cooling products helps offset the
effects of seasonality of the Group's sales.
 
     The Group sells its manufactured housing products to builders of
manufactured housing and, through distributors, to manufactured housing
retailers and owners of such housing. The majority of sales to builders of
manufactured housing consists of furnaces designed and engineered to meet or
exceed certain standards mandated by federal agencies, including the United
States Department of Housing and Urban Development. These standards differ in
several important respects from the standards for furnaces used in site-built
residential homes. The aftermarket channel of distribution includes sales of
both new and replacement air conditioning units and heat pumps and replacement
furnaces. The Company believes that the Group has one major competitor in the
furnace segment of this market, Evcon Industries, a subsidiary of York
International Corporation, which markets its products under the "Evcon/Coleman"
name.
 
     A substantial portion of site-built residential products have been
introduced in the past several years, including a new line of furnaces and a
reengineered line of high efficiency air conditioners and heat pumps.
Residential HVAC products for use in site-built homes are sold through
independently-owned distributors who sell to HVAC contractors. New products for
commercial application up to 10 tons have also been recently introduced.
 
     Competition in the site-built residential HVAC market is intense, and many
suppliers of such equipment have substantially greater financial and marketing
resources than the Group and enjoy greater brand awareness. In these markets,
the Group competes with, among others, Carrier Corporation, Rheem Manufacturing
Company, Lennox Industries, The Trane Company and York International
Corporation. The Group competes in both the manufactured housing and site-built
markets on the basis of breadth and quality of its product line, distribution,
product availability and price. The Company believes that the Group competes
favorably with respect to these factors. To provide greater consumer acceptance
and pull through for its products, the Company has recently licensed from White
Consolidated Industries, Inc. the use of the Frigidaire(R), Tappan(R), Gibson(R)
and Philco(R) brand names for certain of its products.
 
     The Company estimates that more than half of the Group's sales of
residential HVAC products in 1997 were attributable to the replacement market,
which tends to be less cyclical than the new construction market.
 
   
     The Group has eleven manufacturing plants and had 2,266 full-time employees
as of December 31, 1998. The Company believes that the Group's relationships
with its employees are generally satisfactory.
    
 
Windows, Doors and Siding Group
 
     The Windows, Doors and Siding Group, which was acquired by the Company as
part of the Ply Gem Acquisition in August, 1997, is a manufacturer and
distributor of vinyl and wood windows, doors, vinyl siding, soffit, skirting and
shutters for use in the residential construction, DIY and professional
renovation market. The Company believes it is among the largest suppliers of
vinyl windows serving the replacement market in the United States. Additionally,
the Company believes it is a leading supplier of wood windows to major home
centers and a leading supplier of vinyl siding in the United States. The
Company's sales of windows, since the Ply Gem Acquisition, accounted for
approximately 10.1% of the Company's consolidated net sales in 1997.
 
                                       64
<PAGE>   66
 
     Windows and Doors.  The Group manufactures and sells a full line of wood,
clad, composition (wood and vinyl) and vinyl windows and patio doors, glass and
polycarbonate skylights, and wooden interior bifold doors sold under the
Crestline(R), Vetter(R), Kenergy(R) and AWC(R) brand names. In addition, the
Group manufactures energy efficient and maintenance free vinyl windows and patio
doors, under the Great Lakes(R) Gold, PLY GEM(R) Premium, Uniframe(R), MC+(TM),
Garden Windows(TM), Premium and American Comfort(R) brand names. The products
are marketed to both the home improvement and new construction markets through
wholesale and specialty distributors, large contractors, home centers and lumber
yards. The Company believes that it is the fourth largest producer of wood
windows in the United States.
 
     Through the Crestline(R) and Vetter(R) brands, wood windows are available
with primed or clad exteriors, and offer innovative product features with a wide
selection of options. A complete range of window styles include double hung,
single hung, casement, awning, sliding, garden, angle bay and bow windows.
Specialty and custom windows are available in a wide variety of shapes and
sizes. Patio doors are offered in traditional hinged, French hinged, sliding and
French sliding designs. The CrestWood(TM) series of premium wood windows and
patio doors combine the performance of an energy efficient, maintenance-free
solid vinyl exterior with the warmth and beauty of a natural pine, oak, walnut
or cherry interior that can be painted or stained. Most of the products are
available with insulated divided light glass, a patented energy efficient
replica of historically correct narrow muntin bar divided light wood windows and
patio doors. VinylCrest(TM) and ProCraft(TM) comprise a complete line of solid
vinyl windows, which are available for replacement and new construction
applications, in a full range of styles. These product offerings are an
important component of the Group's strategy to offer windows in all price points
and market segments. In addition to a broad line of standard windows and doors,
its custom window factory can build nearly any shape and size window.
 
     The Group manufactures a series of vinyl windows and patio doors for new
construction in both standard and custom sizes. Replacement units are
manufactured to customer specifications. These products include single hung,
double hung, bow and bay, casement, garden, sliding and awning windows, as well
as hinged and sliding patio doors in a variety of vinyl colors and interior
woodgrains, several different grille styles and patterns and a wide assortment
of glass options. Product lines feature fusion welded sash and frame corners
which are guaranteed not to separate, leak air or water, or require maintenance.
The Intercept(TM) warm edge glass spacer system is manufactured in one
continuous piece, resulting in a stronger, more energy efficient insulated glass
unit. The Group is the only vinyl window manufacturer to offer EasyClean(TM)
glass, which works like Teflon(TM) on cookware, providing an owner with a window
which requires less cleaning. These products incorporate other innovations which
differentiate the product line from other window manufacturers, including wood
grain vinyl interiors available in three finishes, multi-point locking hardware,
and sliding patio doors which utilize a proprietary tank type roller system.
Replacement products are sold through specialty distributors and directly to
large contractors. The new construction series of vinyl windows and patio doors
is currently being sold under private label programs and to a select number of
dealer distributors. This multiple brand approach has allowed the Group to
achieve increased penetration in a given geographic area, by offering dealer
distributors individual brands on an exclusive basis.
 
     The Group differentiates itself from its competition with a multiple brand
strategy, multi-channels of distribution (with an emphasis on the home center
market), an established distribution network utilizing custom design and
manufacturing capabilities, and a trained field sales and service support
network. Its ability to sell in full truckload and less than truckload
quantities is tailored to the desires of large home center chains which prefer
to purchase windows direct from the manufacturer. The Group's ability to offer a
broad product line that includes primed, clad, composition (wood and vinyl) and
vinyl windows and patio doors, along with skylights under a single brand is also
important to the Group's sales and marketing strategy, together with the Group's
focus on one of the fastest growing segments in the industry -- home centers and
lumberyards.
 
     Siding.  The Group is a manufacturer of vinyl siding, soffit, skirting and
accessories, which are available in a variety of woodgrains and colors. Its
products are used in both remodeling and new construction applications,
including manufactured housing. Vinyl siding has captured an increasing share of
the overall market for exterior siding materials due to its ease of
installation, high performance, durability, low maintenance requirements and
price stability as compared to alternative siding materials (including wood,
aluminum and masonry). These products are marketed under Cedar Lane(R),
Varigrain(R), Duragrain(R), Timber
 
                                       65
<PAGE>   67
 
Oak(R), and ProLoc(R), brands and the Georgia Pacific, American Comfort(R),
American Herald(TM), and American '76(TM) collection labels. The Company
believes it is the leading supplier to home centers and lumberyards, and the
fourth largest producer of vinyl siding in the United States. In addition, the
Group is a supplier to the Eastern European market.
 
     Vinyl siding is sold to either specialty distributors who, in turn, sell
directly to remodeling contractors or builders, or to building materials
wholesale distributors who sell to home centers and lumberyards who, in turn,
sell to remodeling contractors and consumers (two-step distribution). The
Company believes that it is able to compete on favorable terms as a result of
its distribution coverage, high quality and innovative products, and production
efficiency. Additionally, the Company has a strong presence in the retail
segment of the market. The Company believes that the vinyl siding segment of the
market for siding continues to grow at a rate faster than the overall market for
siding. The Company also believes that the repair and replacement segment of the
residential vinyl siding market will grow at a faster rate than the overall
vinyl siding market.
 
     The Group also manufactures a line of injection molded siding components
for the remodeling and new construction markets. Siding components include
blocks, which allow for the flush mounting of items like light fixtures to the
exterior of a home, and gable vents that provide attic ventilation. The products
are sold to home centers, lumberyards and wholesale distributors of building
materials. It is the only manufacturer of siding components to offer a color
selection to match or complement the colors offered by most major manufacturers
of vinyl siding. The Group has also recently introduced a line of fixed and
variable dimension shutters.
 
     The Group operates ten manufacturing plants in the United States and had
3,709 full-time employees as of December 31, 1998, 1,540 of whom are covered by
collective bargaining agreements which expire in 1999. The Company believes that
the Group's relationships with its employees are satisfactory.
 
Specialty Products and Distribution Group
 
     The Specialty Products and Distribution Group, which was acquired by the
Company as part of the Ply Gem Acquisition in August 1997, manufactures and
distributes pressure treated wood products. The Group offers a full range of
preservative and fire retardant treated lumber and plywood products which are
marketed to cooperative buying groups, lumberyards and independent wholesale
distributors for use generally in residential decking, roofing, siding and
landscaping as well as various commercial construction applications. The Group's
products include fire retardant treated wood products which are used nationwide
for commercial and noncombustible construction. These products, PYRO-GUARD(R)
and EXTERIOR FIRE-X(R) are the Group's major brands in the United States. They
are available from Company plants east of the Rockies and from licensees west of
the Rockies. Other treated wood products include CCA/KDAT preservative treated
wood for commercial and residential construction that is kiln dried after
treatment, COP-8(R) food-safe preservative treated wood and PLYWALL preservative
treated wood highway noise barriers.
 
     While the specialty wood products industry is very competitive, the Company
believes it is able to compete effectively by providing superior customer
service and quality, and wherever possible, proprietary products. The companies
within the Group focus on high margin, niche markets within the broader defined
wood products industry which tends to be commodity driven. Its products are sold
primarily through wholesalers of building materials.
 
     The Specialty Products and Distribution Group operates five production
facilities in the United States and had 194 full-time employees as of December
31, 1998, 27 of whom were covered by collective bargaining agreements which
expire in 1999. The Company believes that the Group's relationships with its
employees are satisfactory.
 
                                       66
<PAGE>   68
 
     The Company has sold four of the five businesses in this Group in 1998. See
"Recent Developments".
 
NUTONE
 
     NuTone is a leading manufacturer and supplier of built-in electrical
appliances for use primarily in residential construction and remodeling. NuTone
has two principal product groups: Ventilation Products and BES Products.
Ventilation Products consist of products that improve home indoor air quality,
including a full line of exhaust fans, heaters, range hoods, paddle fans and
other ventilation products. BES Products offers a wide variety of primarily
electronic home improvement products, including intercoms, audio speakers, door
chimes, central vacuum cleaners and bath cabinets and accessories. All of
NuTone's products are marketed under the NuTone(R) brand name and are included
in the Residential Building Products Group effective August 1, 1998.
 
Ventilation Products
 
     Exhaust Fans and Heaters.  Exhaust fans and heaters have been core product
categories for NuTone, a leading supplier in this segment, for approximately 50
years. Products include a complete line of exhaust fans for residential use in
bath, utility and recreation rooms that increase air quality by removing odors
and airborne pollutants.
 
     Range Hoods.  NuTone is a leading supplier of kitchen range hoods. Range
hoods are marketed in several configurations, including under-cabinet models,
power units (used with custom cabinetry) and exterior mounted kitchen exhaust
fans (used with hood shells).
 
     Attic Fans.  Attic fans reduce attic temperatures and can thereby decrease
air conditioning costs. Products include power roof and gable exhaust fans,
whole house ventilators and attic accessories, including thermostats,
replacement motors and louvers.
 
     Paddle Fans.  Paddle fans are an ancillary product line sold as part of a
builder upgrade package targeted for electrical distributors.
 
BES Products
 
     Intercoms and Radios.  Intercoms offer room-to-room communication and add
security and monitoring convenience. The Radio Intercom line includes a complete
family of products, including a builder series for the entry level home market
and intercoms with compact disc players for the upscale home buyer. Products are
marketed to the new construction and remodeling market through electrical
distributors and professional installers.
 
     Door Chimes.  NuTone introduced the first door chime more than 60 years ago
and is an industry leader in decorative chimes for the home construction market.
Product offerings include wired and wireless chimes in a broad selection of
styles.
 
     Central Cleaning Systems.  NuTone's central cleaning systems provide
cleaning power, efficiency and convenience by utilizing a central power unit,
located away from daily living areas and connected by a network of tubing to
inlets in walls, floors and ceilings.
 
     Bathroom Cabinets.  NuTone's offering of bathroom cabinets includes swing
door and three-door triview styles as well as specialty cabinets. The cabinets
have styles ranging from standard to decorative beveled and framed mirrors and
are constructed from various materials including metal, plastic and wood.
 
     Specialty Products.  NuTone markets several specialty products including
food storage centers, lighting products and ironing centers.
 
                                       67
<PAGE>   69
 
GENERAL CONSIDERATIONS
 
   
     Employees.  The Company employed approximately 9,643 persons at December
31, 1998, of which 2,756 were employed under collective bargaining agreements.
    
 
     Backlog.  The Company's backlog (excluding NuTone) expected to be filled
during 1998 was approximately $127,137,000 at December 31, 1997 ($107,907,000 at
December 31, 1996). Backlog is not regarded as a significant factor for most of
the Company's operations for which orders are generally for prompt delivery.
While backlog stated for December 31, 1997 is believed to be firm, the
possibility of cancellations makes it difficult to assess the firmness of
backlog with certainty.
 
     Research and Development.  The Company's research and development
activities are principally related to new product development and such
expenditures represent approximately 1% of net sales.
 
     Patents and Trademarks.  The Company holds numerous design and process
patents that it considers important, but no single patent is material to the
overall conduct of its business. It is the Company's policy to obtain and
protect patents whenever such action would be beneficial to the Company. The
Company owns several trademarks that it considers material to the marketing of
its products, including Broan(R), Nautilus(R), Venmar(R), vanEE(R), Rangaire(R),
Best(R), Crestline(R), Vetter(R), AWC(R), Kenergy(R), CrestWood(TM),
VinylCrest(TM), ProCraft(TM), Cedar Lane(R), Varigrain(R), Duragrain(R), Timber
Oak(R), ProLoc(R), Great Lakes(R) Gold, PLY GEM(R)Premium, Uniframe(R), MC+(TM)
, Intercept(TM) , Easy-Clean(TM) , PYRO-GUARD(R), EXTERIOR FIRE-X(R), COP-8(R),
Governair(R), Mammoth(R), Temtrol(TM), Miller(R), Intertherm(R), POWERmiser(R),
American Comfort(R), American Herald(TM) and American '76(TM). The Company
believes that its rights in these trademarks are adequately protected.
 
     Raw Materials.  The Company purchases raw materials and most components
used in its various manufacturing processes. The principal raw materials
purchased by the Company are rolled sheet, formed and galvanized steel, copper,
aluminum, plate mirror glass, PVC, polypropylene, glass, vinyl extrusions,
particle board, fiberboard, lumber, plywood, various chemicals, paints, resins
and plastics.
 
     The materials, molds and dyes, subassemblies and components purchased from
other manufacturers, and other materials and supplies used in the Company's
manufacturing processes have generally been available from a variety of sources.
Whenever practical, the Company establishes multiple sources for the purchase of
raw materials and components to achieve competitive pricing, ensure flexibility
and protect against supply disruption. From time to time, increases in raw
material costs can affect future supply availability due in part to raw material
demands by other industries.
 
     Working Capital.  The carrying of inventories to support customers and to
permit prompt delivery of finished goods requires substantial working capital.
Substantial working capital is also required to carry receivables. The demand
for the Company's products is seasonal, particularly in the Northeast and
Midwest regions of the United States and in Canada where inclement weather
during the winter months usually reduces the level of building and remodeling
activity in both the home improvement and new construction markets. The Ply Gem
businesses, acquired in August 1997, have in the past been more seasonal in
nature than the Company's subsidiaries owned prior to the acquisition. As a
result, the demand for working capital of the Company's subsidiaries is greater
from late in the first quarter until early in the fourth quarter. See
"Management's Discussion and Analysis of Financial Condition and Results of
Operations -- Liquidity and Capital Resources."
 
LEGAL PROCEEDINGS
 
     The Company and its subsidiaries are subject to numerous federal, state and
local laws and regulations, including environmental laws and regulations that
impose limitations on the discharge of pollutants into the air and water and
establish standards for the treatment, storage and disposal of solid and
hazardous wastes. The Company believes that it is in substantial compliance with
the material laws and regulations applicable to it. The Company is involved in
current, and may become involved in future, remedial actions under federal and
 
                                       68
<PAGE>   70
 
state environmental laws and regulations which impose liability on companies to
clean up, or contribute to the cost of cleaning up, sites at which their
hazardous wastes or materials were disposed of or released. Such claims may
relate to properties or business lines acquired by the Company after a release
has occurred. In other instances, the Company may be partially liable under law
or contract to other parties that have acquired businesses or assets from the
Company for past practices relating to hazardous substances management. The
Company believes that all such claims asserted against it, or such obligations
incurred by it, will not have a material adverse effect upon the Company's
financial condition or results of operations. Expenditures in 1996 and 1997 to
evaluate and remediate such sites were not material. However, the Company is
presently unable to estimate accurately its ultimate financial exposure in
connection with identified or yet to be identified remedial actions due among
other reasons to: (i) uncertainties surrounding the nature and application of
environmental regulations, (ii) the Company's lack of information about
additional sites with respect to which it may be listed as a potentially
responsible party ("PRP"), (iii) the level of clean-up that may be required at
specific sites and choices concerning the technologies to be applied in
corrective actions and (iv) the time periods over which remediation may occur.
Furthermore, since liability for site remediation is joint and several, each PRP
is potentially wholly liable for other PRPs that become insolvent or bankrupt.
Thus, the solvency of other PRPs could directly affect the Company's ultimate
aggregate clean-up costs. In certain circumstances, the Company's liability for
clean-up costs may be covered in whole or in part by insurance or
indemnification obligations of third parties.
 
     In addition to the legal matters described above, the Company and its
subsidiaries are parties to various legal proceedings incident to the conduct of
their businesses. None of these proceedings is expected to have a material
adverse effect, either individually or in the aggregate, on the Company's
financial position or results of operations. See Note 8 of Notes to the
Company's Consolidated Financial Statements included elsewhere herein.
 
                                       69
<PAGE>   71
 
                                   MANAGEMENT
 
DIRECTORS OF THE COMPANY
 
     The following table sets forth the name, age as of the date hereof and
current principal occupation or employment and five-year employment history for
the five members currently serving on the Company's Board of Directors. Unless
otherwise noted, each director has maintained the same principal occupation
during the past five years.
 
<TABLE>
<CAPTION>
                                                        PRESENT PRINCIPAL OCCUPATION OR EMPLOYMENT AND
                      NAME                        AGE            FIVE-YEAR EMPLOYMENT HISTORY
                      ----                        ---   ----------------------------------------------
<S>                                               <C>   <C>
Richard L. Bready...............................  54    Chairman and Chief Executive Officer of the
                                                        Company.
Phillip L. Cohen................................  67    Partner with the professional service firm
                                                        Arthur Andersen LLP from 1965 until his
                                                        retirement in June 1994 and a financial
                                                        consultant since that date.
Richard J. Harris...............................  62    Vice President and Treasurer of the Company.
William I. Kelly................................  55    Director of the Graduate School of
                                                        Professional Accounting of Northeastern
                                                        University.
J. Peter Lyons..................................  64    President of The Lyons Companies, an insurance
                                                        and employee benefits consulting company.
</TABLE>
 
EXECUTIVE OFFICERS OF THE COMPANY
 
     The following table sets forth the name, age as of the date hereof and
position and office held with the Company for the following persons who may be
deemed executive officers of the Company. Each executive officer has maintained
the same position and office with the Company during the past five years.
 
   
<TABLE>
<CAPTION>
NAME                                              AGE      PRESENT POSITION WITH THE COMPANY
- ----                                              ---      ---------------------------------
<S>                                               <C>   <C>
Richard L. Bready...............................  54    Chairman and Chief Executive Officer
Almon C. Hall...................................  52    Vice President, Controller and Chief
                                                        Accounting Officer
Richard J. Harris...............................  62    Vice President and Treasurer
Kenneth J. Ortman...............................  63    Senior Vice President, Group Operations
Kevin W. Donnelly...............................  44    Vice President, General Counsel and
                                                        Secretary
</TABLE>
    
 
     Executive officers are elected annually by the Board of Directors of the
Company and serve until their successors are chosen and qualified. Mr. Bready
has an employment agreement with the Company providing for his employment as
Chief Executive Officer through 2002, which term is extended at the end of each
year for an additional year until either party gives notice that it will not be
further extended. Mr. Bready has been Chief Executive Officer of the Company
since October 31, 1990.
 
                                       70
<PAGE>   72
 
                              DESCRIPTION OF NOTES
 
GENERAL
 
     The Original Notes were issued and the Exchange Notes will be issued
pursuant to an indenture (the "Indenture") dated as of July 31, 1998 between the
Company and State Street Bank and Trust Company, a Massachusetts banking
corporation, as trustee (the "Trustee"). The terms of the Exchange Notes include
those stated in the Indenture and those made part of the Indenture by reference
to the Trust Indenture Act of 1939, as amended (the "Trust Indenture Act"), as
in effect on the date of the Indenture. The Notes are subject to all such terms,
and holders of the Notes are referred to the Indenture and the Trust Indenture
Act for a statement thereof. The following summary of certain provisions of the
Indenture, the Notes and the Registration Rights Agreement does not purport to
be complete and is qualified in its entirety by reference to the Indenture and
the Registration Rights Agreement, including the definitions included in the
Indenture of certain terms used below. Copies of the Indenture and Registration
Rights Agreement will be made available to holders of Notes as set forth below
under "-- Additional Information." The definitions of certain terms used in the
following summary are set forth below under "-- Certain Definitions."
 
     The form and terms of the Exchange Notes are the same as the form and terms
of the Original Notes (which they replace) except that (i) the Exchange Notes
bear a Series B designation, (ii) the Exchange Notes have been registered under
the Securities Act and, therefore, will generally not bear legends restricting
the transfer thereof (except as may be required under the state securities laws)
and (iii) the Exchange Notes will not provide for the payment of Liquidated
Damages (except in certain limited circumstances set forth in the Registration
Rights Agreement). See "The Exchange Offer -- Registration Rights; Liquidated
Damages."
 
     The Exchange Notes will be unsecured senior obligations of the Company
limited to $210 million aggregate principal amount. The Notes will rank senior
in right of payment to all existing and future subordinated Indebtedness of the
Company, including the 9 7/8% Notes, and pari passu in right of payment with all
existing and future senior unsecured Indebtedness of the Company, including the
9 1/4% Notes and the 9 1/8% Notes. The Notes will be effectively subordinated to
all existing and future secured Indebtedness of the Company and the Subsidiary
Guarantors, if any, including secured Indebtedness pursuant to the Company
Credit Facility or the Ply Gem Credit Facility to the extent of the value of the
assets securing such Indebtedness, and the Notes will be structurally
subordinated to all Indebtedness and other obligations (including trade
payables) of the Company's Subsidiaries (including Ply Gem and its
Subsidiaries). At October 3, 1998, after pro forma giving effect to the
acquisition of Napco, Inc., the Notes would have been effectively subordinated
to approximately $495.2 million of indebtedness for borrowed money, trade
payables and accrued liabilities of the Company's Subsidiaries.
 
     Although the Indenture contains certain covenants and provisions that
afford certain protections to holders of the Notes (the "Holders"), such
covenants and provisions would not necessarily afford the Holders of the Notes
protection in the event of a highly leveraged transaction involving the Company,
including a leveraged transaction initiated or supported by the Company, the
management of the Company or any affiliate of either party. See "-- Certain
Covenants" below.
 
PRINCIPAL, MATURITY AND INTEREST
 
     The Notes will mature on August 1, 2008. Interest on the Notes will accrue
at the rate of 8 7/8% per annum and will be payable semi-annually on each
February 1 and August 1 commencing on February 1, 1999, to Holders on the
immediately preceding January 15 or July 15, whether or not a business day.
Interest on the Notes will accrue from the most recent date to which interest
has been paid or, if no interest has been paid, from the date of issuance of the
Notes. Interest will be computed on the basis of a 360-day year comprised of
twelve 30-day months.
 
     Principal of, premium, if any, interest on, and Liquidated Damages, if any,
with respect to the Notes will be payable by wire transfer of immediately
available funds to the holder of the Global Notes; provided, that payments of
interest and Liquidated Damages, if any, may be made at the office or agency of
the Company
 
                                       71
<PAGE>   73
 
maintained for such purpose or, at the option of the Company, by check mailed to
the Holders at their respective addresses set forth in the register of Holders.
Unless otherwise designated by the Company, the Company's office or agency in
New York will be the office of the Trustee maintained for such purpose. The
Notes will be issued only in registered form, without coupons, in denominations
of $1,000 and integral multiples thereof. The Trustee is Paying Agent and
Registrar under the Indenture. The Company may act as Paying Agent or Registrar
under the Indenture, and the Company may change the Paying Agent or Registrar
without notice to the Holders.
 
OPTIONAL REDEMPTION
 
     The Notes will be redeemable by the Company, in whole or in part, on or
after August 1, 2003 at the following redemption prices (expressed as a
percentage of the principal amount) if redeemed during the 12-month period
beginning August 1 of the years indicated below, in each case, together with
accrued and unpaid interest and Liquidated Damages, if any, to the redemption
date:
 
<TABLE>
<CAPTION>
                            YEAR                              PERCENTAGE
                            ----                              ----------
<S>                                                           <C>
2003........................................................   104.438%
2004........................................................   102.958%
2005........................................................   101.479%
2006 and thereafter.........................................   100.000%
</TABLE>
 
     Notice of the redemption must be mailed by first class mail at least 30 but
not more than 60 days before the redemption date to each Holder to be redeemed
at such Holder's registered address. If any Note is to be redeemed in part only,
the notice of redemption relating to that Note will state the principal amount
thereof to be redeemed and a new Note in principal amount equal to the
unredeemed portion will be issued in the name of the Holder upon cancellation of
the original Note. On and after the redemption date, interest ceases to accrue
on Notes or portions of Notes called for redemption, unless the Company shall
default in the payment of the redemption price. If less than all the outstanding
Notes are to be redeemed at any time, selection of the Notes for redemption will
be made by the Trustee by lot or, if such method is prohibited by the rules of
any stock exchange on which the Notes are then listed, any other method the
Trustee considers reasonable, provided that Notes shall be redeemed in principal
amounts of $1,000 or integral multiples thereof.
 
MANDATORY REDEMPTION
 
     The Company is not required to make mandatory redemption or sinking fund
payments with respect to the Notes. However, as described below, the Company may
be obligated, under certain circumstances, to make an offer to purchase (i) all
outstanding Notes at a redemption price of 101% of the principal amount thereof,
plus accrued and unpaid interest and Liquidated Damages, if any, to the date of
purchase, upon a Change of Control; and (ii) outstanding Notes with a portion of
the Excess Proceeds of Asset Sales at a redemption price of 100% of the
principal amount thereof, plus accrued and unpaid interest and Liquidated
Damages, if any, to the date of purchase. See "-- Change of Control" and
"-- Certain Covenants -- Limitation on Use of Proceeds from Asset Sales."
 
CHANGE OF CONTROL
 
     Upon the occurrence of a Change of Control, each Holder will have the right
to require the repurchase of all or any part of such Holder's Notes pursuant to
the offer described below (the "Change of Control Offer") at a purchase price
equal to 101% of the aggregate principal amount thereof plus accrued and unpaid
interest and Liquidated Damages, if any, to the date of purchase (the "Change of
Control Payment").
 
     Immediately following any Change of Control, the Company is required to
mail a notice to the Trustee and to each Holder stating: (i) that the Change of
Control Offer is being made pursuant to the Repurchase Upon Change of Control
covenant of the Indenture and that all Notes tendered will be accepted for
payment; (ii) the amount of the Change of Control Payment and the purchase date
(the "Change of Control Payment Date"), which may not be earlier than 30 days
nor later than 60 days from the date such notice is mailed;
 
                                       72
<PAGE>   74
 
(iii) that any Note not tendered will continue to accrue interest; (iv) that,
unless the Company defaults in the payment thereof, all Notes accepted for
payment pursuant to the Change of Control Offer will cease to accrue interest on
and after the Change of Control Payment Date; (v) that Holders electing to have
any Notes purchased pursuant to a Change of Control Offer will be required to
surrender the Notes to be purchased to the Paying Agent at the address specified
in the notice prior to the close of business on the third business day preceding
the Change of Control Payment Date; (vi) that Holders will be entitled to
withdraw Notes they have tendered on the terms and conditions set forth in such
notice; and (vii) that Holders whose Notes are being purchased only in part will
be issued new Notes (or book-entry notation made with respect thereto) equal in
principal amount to the unpurchased portion of the Notes tendered; provided that
the portion of each Note purchased and each such new Note issued (or book-entry
notation, if applicable) shall be in a principal amount of $1,000 or an integral
multiple thereof.
 
     On the Change of Control Payment Date, the Company will, to the extent
lawful, (i) accept for payment all Notes or portions thereof tendered pursuant
to the Change of Control Offer and not withdrawn, (ii) deposit with the Paying
Agent an amount sufficient to pay the Change of Control Payment in respect of
all Notes or portions thereof so tendered and not withdrawn, and (iii) deliver
or cause to be delivered to the Trustee all Notes so tendered and not withdrawn
together with an Officers' Certificate specifying the Notes or portions thereof
tendered to the Company. The Paying Agent will promptly mail to each Holder of
Notes so tendered and not withdrawn the Change of Control Payment in respect of
such Notes, and the Trustee will promptly authenticate and mail to such Holder a
new Note (or cause to be transferred by book entry) equal in principal amount to
any unpurchased portion of the Notes surrendered; provided that each such new
Note shall be in a principal amount of $1,000 or an integral multiple thereof.
The Company will publicly announce the results of the Change of Control Offer on
or as soon as practicable after the Change of Control Payment Date.
 
     The Company will comply with the requirements of Rule 14e-1 under the
Exchange Act, and any other securities laws and regulations thereunder to the
extent such laws and regulations are applicable in connection with the
repurchase of Notes triggered by a Change of Control.
 
     A "Change of Control" will be deemed to have occurred at such time as any
of the following events occur: (i) there is consummated any consolidation or
merger of the Company with or into another corporation, or all or substantially
all of the assets of the Company are sold, leased or otherwise transferred or
conveyed to another Person (other than pursuant to a bona fide pledge of assets
to secure Indebtedness made in accordance with the Indenture), and the holders
of the Company's common stock outstanding immediately prior to such
consolidation, merger, sale, lease or other transfer or conveyance or one or
more Exempt Persons do not hold, directly or indirectly, at least a majority of
the common stock of the continuing or surviving corporation immediately after
such consolidation or merger or at least a majority of the Equity Interests of
such Person; (ii) there is filed a report on Schedule 13D or 14D-1 (or any
successor schedule, form or report) pursuant to the Exchange Act disclosing that
any person (defined, solely for the purposes of the Change of Control provision,
as the term "person" is used in Section 13(d)(3) or Section 14(d)(2) of the
Exchange Act or any successor provision to either of the foregoing) has become
the beneficial owner (as the term "beneficial owner" is defined under Rule 13d-3
or any successor rule or regulation promulgated under the Exchange Act) of 50%
or more of the combined voting power of all the Company's then outstanding
securities entitled to vote generally for the election of directors; provided,
however, that a person shall not be deemed to be the beneficial owner of, or to
own beneficially, (A) any securities tendered pursuant to a tender or exchange
offer made by or on behalf of such person or any of such person's Affiliates or
associates until such tendered securities are accepted for purchase or exchange
thereunder, or (B) any securities if such beneficial ownership (1) arises solely
as a result of a revocable proxy delivered in response to a proxy or consent
solicitation made pursuant to the applicable rules and regulations under the
Exchange Act, and (2) is not also then reportable on Schedule 13D (or any
successor schedule) under the Exchange Act; or (iii) during any consecutive
two-year period, individuals who at the beginning of such period constituted the
Board of Directors of the Company (together with any new directors whose
election by such Board of Directors or whose nomination for election by the
stockholders of the Company was approved by a vote of 66 2/3% of the directors
then still in office who were either directors at the beginning of such period
or whose election or nomination for election was
 
                                       73
<PAGE>   75
 
previously so approved) cease for any reason to constitute a majority of the
Board of Directors of the Company then in office.
 
     Notwithstanding the foregoing, a Change of Control shall not be deemed to
have occurred under clause (ii) of the immediately preceding paragraph solely by
virtue of the Company, any Subsidiary of the Company, any employee stock
ownership plan or any other employee benefit plan of the Company or any such
Subsidiary, any other person holding securities of the Company for or pursuant
to the terms of any such employee benefit plan, or any Exempt Person, filing or
becoming obligated to file a report on Schedule 13D or Schedule 14D-1 (or any
successor schedule, form or report) under the Exchange Act disclosing beneficial
ownership by it of securities of the Company, whether equal to or greater than
50% of the combined voting power of the Company's then outstanding securities
entitled to vote generally for the election of directors or otherwise.
 
     The Change of Control purchase feature may in certain circumstances make
more difficult or discourage a takeover of the Company and, thus, the removal of
the incumbent management. Although the Company has from time to time received
and considered proposals which might involve a Change of Control, the Change of
Control purchase feature was not adopted as a result of management's knowledge
of any specific effort to accumulate shares of Common Stock or to obtain control
of the Company by means of a merger, tender offer, solicitation or otherwise, or
part of a plan by management to adopt a series of antitakeover provisions.
Instead, the Change of Control purchase feature is a standard term contained in
other similar debt offerings and the terms of such feature result from
negotiations between the Company and the Initial Purchasers. Subject to the
limitations discussed below, the Company could, in the future, enter into
certain transactions, including acquisitions, refinancings or other
recapitalizations, that would not constitute a Change of Control under the
Indenture, but that could increase the amount of indebtedness outstanding at
such time or otherwise affect the Company's capital structure or credit ratings.
 
     The occurrence of a Change of Control would require the Company to offer to
acquire the 9 7/8% Notes, the 9 1/4% Notes and the 9 1/8% Notes at 101% of the
principal amount thereof and likely would result in an event of default under
the Company Credit Facility and the Ply Gem Credit Facility permitting the
lenders thereunder to accelerate the repayment of the Indebtedness thereunder.
If a Change of Control were to occur, there can be no assurance that the Company
would have sufficient funds to satisfy all of such obligations. In addition, the
Company's ability to make such payment may be limited by the terms of its
then-existing borrowings and other agreements applicable to the Company or its
Subsidiaries. Certain existing agreements applicable to certain of the Company's
Subsidiaries restrict the ability of these Subsidiaries to make distributions to
the Company. See "Description of Other Obligations."
 
     Neither the Board of Directors of the Company nor the Trustee may waive the
Change of Control repurchase feature of the Indenture.
 
     One of the events that constitutes a Change of Control under the Indenture
is a sale, lease or other transfer or conveyance of all or substantially all of
the assets of the Company. There is no precise established definition under
applicable law of the term "substantially all" and, accordingly, if the Company
were to engage in transactions in which it disposed of less than all of its
assets, a question could arise as to whether such disposition was of
"substantially all" of its assets and whether because of such disposition the
Company was required to repurchase the Notes as a result of a Change of Control.
 
CERTAIN COVENANTS
 
     Limitation on Restricted Payments.  The Company shall not, and shall not
permit any of its Restricted Subsidiaries to, directly or indirectly: (i)
declare or pay any dividend on, or make any distribution in respect of the
Company's or any such Restricted Subsidiary's Capital Stock or other Equity
Interests, except to the extent any such dividend or other distribution is (a)
actually received by the Company or a Restricted Subsidiary thereof or (b)
payable solely in shares of Capital Stock or other Equity Interests (other than
Redeemable Stock or Capital Stock convertible into any security other than such
Capital Stock) of the Company or such Restricted Subsidiary, as the case may be;
(ii) purchase, redeem or otherwise acquire or retire for value any Capital Stock
or other Equity Interests of the Company or any of its Restricted
 
                                       74
<PAGE>   76
 
Subsidiaries (other than Capital Stock or other Equity Interests held by the
Company or any Wholly-Owned Subsidiary of the Company that is a Restricted
Subsidiary); (iii) prepay, repay, purchase, repurchase, redeem, defease or
otherwise acquire or retire for value, prior to a scheduled repayment date,
scheduled mandatory sinking fund payment date or maturity date any Indebtedness
of the Company that is subordinate in right of payment to the Notes (other than
in connection with any refinancing of such Indebtedness permitted by the
Indenture); or (iv) make any Investment other than Permitted Investments (each
such action described in any of clauses (i) through (iv) above being referred to
as a "Restricted Payment"), if, at the time of such Restricted Payment, (1) a
Default or Event of Default shall have occurred and be continuing or shall occur
as a consequence thereof; (2) such Restricted Payment, together with the
aggregate amount of all other Restricted Payments declared or made on or after
the issue date of the Notes (including, without duplication, Restricted Payments
described in the next succeeding paragraph), exceeds the sum of (A) 50% of the
cumulative Consolidated Net Income of the Company for the period commencing on
July 5, 1998 through the last day of the fiscal quarter immediately preceding
the date of such proposed Restricted Payment (provided that if the amount of
such cumulative Consolidated Net Income divided by the number of full fiscal
quarters of the Company in the applicable period exceeds $5,250,000, then such
amount shall equal (i) 50% of the product of $5,250,000 multiplied by the number
of full fiscal quarters in such period plus (ii) 75% of the amount in excess of
the product of $5,250,000 multiplied by the number of full fiscal quarters in
such period) (or, if the cumulative Consolidated Net Income of the Company shall
be a deficit, minus 100% of such deficit); (B) the aggregate net cash proceeds,
and the Fair Market Value of any property other than cash, if any, received by
the Company (other than from a Restricted Subsidiary of the Company) from the
issuance and sale at any time after May 1, 1998 of either Capital Stock of the
Company (other than Redeemable Stock or any Capital Stock convertible into any
security other than such Capital Stock) or Indebtedness that is convertible into
Capital Stock of the Company (other than Redeemable Stock or any Capital Stock
convertible into any security other than such Capital Stock), to the extent such
Indebtedness is actually converted into such Capital Stock; (C) an amount equal
to any cash and the Fair Market Value (at the time of receipt) of other assets
received by the Company or any of its Restricted Subsidiaries after the date of
the issuance of the Notes as a dividend or other distribution from any
Unrestricted Subsidiary; and (D) the Fair Market Value of any Investment held by
either the Company or any Restricted Subsidiary of the Company in any
Unrestricted Subsidiary at the time such Unrestricted Subsidiary is redesignated
as a Restricted Subsidiary in accordance with the provisions of the Indenture;
or (3) the Company could not incur at least $1.00 of additional Indebtedness
pursuant to the first paragraph of the Limitation on Additional Indebtedness
covenant.
 
     The foregoing provisions shall not prohibit, so long as no Default or Event
of Default shall have occurred and be continuing or shall occur as a consequence
thereof, (i) the payment of any dividend within 60 days after the date of
declaration thereof, if at such date of declaration such payment would have
complied with the provisions of the Indenture; (ii) the declaration and payment
by a Restricted Subsidiary of the Company which is required to file periodic
reports under Section 13 or 15(d) of the Exchange Act (a "Reporting Subsidiary")
of dividends on its common stock to all holders of such common stock on a pro
rata basis out of funds legally available for the payment of dividends, provided
that the amount of such dividends in any fiscal year of such Reporting
Subsidiary shall not exceed 25% of the Consolidated Net Income of such Reporting
Subsidiary for the immediately preceding fiscal year; (iii) the purchase,
redemption, acquisition, cancellation or other retirement for value of shares of
Capital Stock of the Company, options to purchase such shares or related stock
appreciation rights or similar securities held by current or former officers,
employees or directors (or their estates or beneficiaries under their estates)
of the Company or any Restricted Subsidiary; provided that the aggregate
consideration paid for such purchase, redemption, cancellation or other
retirement after the date hereof does not exceed $2,500,000 in the aggregate in
any fiscal year of the Company; (iv) the prepayment, repayment, purchase,
repurchase, redemption, defeasance or other acquisition or retirement for value
of any or all of the 9 7/8% Notes at any time within one year of the scheduled
maturity date thereof; and (v) the redemption, repurchase, defeasance or other
acquisition or retirement for value of Indebtedness of the Company that is
subordinated in right of payment to the Notes in exchange for, or out of the
proceeds of a substantially concurrent offering of, shares of Capital Stock of
the Company (other than Redeemable Stock or any Capital Stock convertible into
any security other than such Capital Stock).
 
                                       75
<PAGE>   77
 
     Limitation on Additional Indebtedness.  The Company shall not, and shall
not permit any of its Restricted Subsidiaries to, directly or indirectly,
create, incur, issue, assume, guarantee or otherwise become directly or
indirectly liable with respect to (each, an "incurrence") any Indebtedness,
including, without limitation, Acquired Indebtedness; provided, however, that
the Company may incur Indebtedness if (i) no Default or Event of Default shall
have occurred and be continuing at the time or after giving effect to the
incurrence of such Indebtedness and (ii) the Consolidated Cash Flow Coverage
Ratio of the Company for the four full fiscal quarters ending immediately prior
to the date of the incurrence of such additional Indebtedness is at least 2.0 to
1.0.
 
     The foregoing limitations shall not apply, without duplication, to:
 
     (i) Existing Indebtedness;
 
     (ii) Indebtedness of (a) the Company represented by the Notes and the
Indenture or (b) any Subsidiary Guarantor under any Subsidiary Guaranty;
 
     (iii) Indebtedness of the Company and its Restricted Subsidiaries under the
Company Credit Facility; provided, that the aggregate principal amount of
Indebtedness (including the available undrawn amount of any letters of credit
issued thereunder) so incurred on any date, together with all other Indebtedness
incurred pursuant to this clause (iii) and outstanding on such date, shall not
exceed the greater of (a) $75,000,000 and (b) the sum of 85% of Eligible
Receivables of the Company and its Subsidiaries, plus 65% of Eligible Inventory
of the Company and its Subsidiaries.
 
     (iv) Indebtedness of (a) Broan Limited and any Canadian Subsidiaries which
are Restricted Subsidiaries under the Broan Limited Credit Facility; provided
that (1) the aggregate outstanding principal amount (including the available
undrawn amount of any letters of credit issued thereunder) so incurred on any
date, together with all other Indebtedness incurred pursuant to this clause (iv)
and outstanding on such date, shall not exceed the greater of (x) $30,000,000
(Canadian) and (y) the sum of 85% of Eligible Receivables of Broan Limited and
the Canadian Subsidiaries which are Restricted Subsidiaries plus 65% of Eligible
Inventory of Broan Limited and the Canadian Subsidiaries which are Restricted
Subsidiaries (but without duplication of any such Eligible Receivables or
Eligible Inventory of Broan Limited and the Canadian Subsidiaries used as a
basis to incur Indebtedness pursuant to clause (iii) above) and (2) such
Indebtedness shall be secured only by Liens on assets of Broan Limited and the
Canadian Subsidiaries which are Restricted Subsidiaries, and (b) the Company
under its limited guaranty of not more than $20,000,000 (Canadian) of the
Indebtedness of Broan Limited and the Canadian Subsidiaries which are Restricted
Subsidiaries under the Broan Limited Credit Facility;
 
     (v) Indebtedness of NuTone and any NuTone Subsidiary not exceeding at any
time $6,000,000 in aggregate outstanding principal amount and, if secured,
secured only by Liens on assets of NuTone and any NuTone Subsidiary;
 
     (vi) Indebtedness of the Company to any of its Wholly-Owned Subsidiaries
that is a Restricted Subsidiary, provided that such Indebtedness is
contractually subordinated in right of payment to the Notes, or Indebtedness of
any Subsidiary of the Company that is a Restricted Subsidiary to the Company or
to any other Wholly-Owned Subsidiary of the Company that is a Restricted
Subsidiary, provided that any such Indebtedness incurred by a Subsidiary
Guarantor is contractually subordinated in right of payment to its guarantee of
the Notes; provided further that if the Company or any of its Restricted
Subsidiaries incurs Indebtedness to a Wholly-Owned Subsidiary of the Company
that is a Restricted Subsidiary which, at any time after such incurrence, ceases
to be a Wholly-Owned Subsidiary or ceases to be a Restricted Subsidiary, then
all such Indebtedness in excess of the amount of Allowable Subsidiary Loans
shall be deemed to have been incurred at the time such former Wholly-Owned
Subsidiary ceases to be a Wholly-Owned Subsidiary of the Company or ceases to be
a Restricted Subsidiary;
 
     (vii) Indebtedness of a Restricted Subsidiary under a guaranty of
Indebtedness of the Company (other than the Notes) which causes such Restricted
Subsidiary to become a Subsidiary Guarantor pursuant to the provisions of the
Limitation on Guaranties by Subsidiaries covenant;
 
                                       76
<PAGE>   78
 
     (viii) Indebtedness of the Company and its Restricted Subsidiaries under
Interest Rate Agreements, Currency Agreements and Commodity Agreements, provided
that (a) in the case of Interest Rate Agreements, such Interest Rate Agreements
relate to Indebtedness permitted to be incurred under the Indenture and the
notional principal amount of the obligations of the Company and its Restricted
Subsidiaries under such Interest Rate Agreements does not exceed the principal
amount of such Indebtedness, and (b) in the case of Currency Agreements that
relate to other Indebtedness, such Currency Agreements do not increase the
Indebtedness of the Company and its Restricted Subsidiaries outstanding at any
time other than as a result of fluctuations in foreign currency exchange rates
or by reason of fees, indemnities and compensation payable thereunder;
 
     (ix) Indebtedness of the Company and its Restricted Subsidiaries incurred
in the ordinary course of business under guaranties of Indebtedness of
suppliers, licensees, franchisees or customers;
 
     (x) Indebtedness incurred by the Company and its Restricted Subsidiaries
consisting of Purchase Money Obligations and Capital Lease Obligations not
exceeding at any time $30,000,000 in aggregate outstanding principal amount;
 
     (xi) Acquired Indebtedness incurred by a Restricted Subsidiary of the
Company to the extent such Indebtedness could have been incurred by the Company
under the limitations set forth in the preceding paragraph of this Limitation on
Additional Indebtedness covenant, after giving pro forma effect to the
acquisition of such Restricted Subsidiary by the Company;
 
     (xii) Indebtedness of any Restricted Subsidiary existing at the time of the
designation of such Subsidiary as a Restricted Subsidiary in accordance with the
terms of the Indenture if immediately prior to such designation such Subsidiary
was an Unrestricted Subsidiary, provided that, after giving pro forma effect to
such designation, such Indebtedness could have been incurred by the Company
under the limitations set forth in the preceding paragraph of this Limitation on
Additional Indebtedness covenant (assuming for purposes of this clause (xii)
only that the Consolidated Cash Flow Coverage Ratio set forth in such paragraph
were 2.25 to 1.0); and provided further that, none of the Company or any of its
other Restricted Subsidiaries shall provide credit support of any kind
(including any undertaking, agreement or instrument that would constitute
Indebtedness), or otherwise be at any time, directly or indirectly liable (as a
guarantor or otherwise), for such existing Indebtedness, except to the extent
the Company or any of its Restricted Subsidiaries could become so liable in
accordance with the provisions of this Limitation on Additional Indebtedness
covenant (other than solely in accordance with clause (vi) above or this clause
(xii)).
 
     (xiii) Indebtedness of the Company and its Restricted Subsidiaries in
respect of performance bonds, bankers' acceptances, letters of credit,
short-term overdraft facilities and surety or appeal bonds incurred or provided
in the ordinary course of business;
 
     (xiv) Indebtedness of (a) Nortek (UK) Limited and its Subsidiaries arising
out of advances on exports, advances on imports, advances on trade receivables,
factoring of receivables and similar transactions in the ordinary course of
business and, if secured, secured only by Liens on assets of Nortek (UK) Limited
and its Subsidiaries and (b) the Company under its limited guaranty of not more
than $10,000,000 of any such Indebtedness of Nortek (UK) Limited and its
Subsidiaries;
 
     (xv) other Indebtedness of the Company and its Restricted Subsidiaries not
to exceed at any time $25,000,000 in aggregate outstanding principal amount;
 
     (xvi) Liens permitted under the Limitation on Liens covenant; and
 
     (xvii) Indebtedness ("Refinancing Indebtedness") created, incurred, issued,
assumed or guaranteed in exchange for, or the proceeds of which are used to
extend, refinance, renew, replace, substitute or refund ("refinance"),
Indebtedness described in the preceding paragraph or referred to in clauses (i)
through (xv) above; provided, however, that (a) the principal amount of such
Refinancing Indebtedness (or if such Refinancing Indebtedness is issued at a
price less than the principal amount thereof, the original issue amount of such
Refinancing Indebtedness), together with the principal amount of any remaining
Indebtedness under the agreement or instrument governing the Indebtedness being
refinanced, (1) in the case of Refinancing
 
                                       77
<PAGE>   79
 
Indebtedness incurred to refinance Indebtedness permitted to be incurred under
any of clauses (iii) through (v) and (xv) above, shall not, when added to all
other Indebtedness outstanding under such clause, exceed the aggregate amount of
Indebtedness permitted to be incurred under such clause, and (2) in the case of
Refinancing Indebtedness incurred to refinance Indebtedness permitted to be
incurred under any of clauses (i), (ii) and (vi) through (xiv) above, shall not
exceed the aggregate amount of such Indebtedness outstanding at the time of such
refinancing, in each case, after giving effect to any mandatory reductions in
principal or other repayments required under the agreement or instrument
governing such Indebtedness; (b) such Refinancing Indebtedness shall be
subordinated in right of payment to the Notes or the Subsidiary Guaranties at
least to the same extent as the Indebtedness to be refinanced; (c) such
Refinancing Indebtedness shall have an Average Life and Stated Maturity equal
to, or greater than, the Average Life and Stated Maturity of the Indebtedness to
be refinanced at the time of such incurrence; (d) the proceeds of such
Refinancing Indebtedness, if incurred by a Restricted Subsidiary of the Company,
shall not be used to refinance Indebtedness of the Company or another Subsidiary
of the Company; and (e) the incurrence of any such Refinancing Indebtedness is
substantially simultaneous with the refinancing of the Indebtedness to be
refinanced.
 
     For purposes of this Limitation on Additional Indebtedness covenant, the
accretion of original issue discount on Indebtedness shall not be deemed to be
an incurrence of Indebtedness.
 
     The Company will not, directly or indirectly, incur any Indebtedness that
is expressly subordinated to any other Indebtedness of the Company or any
Restricted Subsidiary unless such Indebtedness is also expressly subordinated to
the Notes (and any Subsidiary Guaranty, as applicable) to the same extent and in
the same manner as such Indebtedness is subordinated to such other Indebtedness
of the Company or such Restricted Subsidiary.
 
     Limitation on Sale or Issuance of Preferred Stock of Restricted
Subsidiaries.  The Company shall not (i) permit any of its Restricted
Subsidiaries to issue or sell to any Person except the Company or a Wholly-
Owned Subsidiary of the Company that is a Restricted Subsidiary any preferred
stock of any Restricted Subsidiary, or (ii) sell or otherwise convey or dispose
of, or permit any of its Wholly-Owned Subsidiaries that is a Restricted
Subsidiary to sell or otherwise convey or dispose of, any such preferred stock
so issued or sold to the Company or any of its Wholly-Owned Subsidiaries that is
a Restricted Subsidiary (except to the issuer thereof, the Company or any of its
other Wholly-Owned Subsidiaries that is a Restricted Subsidiary).
 
     Limitation on Liens.  The Company shall not, and shall not permit any
Restricted Subsidiary to, directly or indirectly, create, incur, assume or
suffer to exist any Lien on any Principal Property or on any shares of Capital
Stock of any Restricted Subsidiary of the Company held by the Company or any
other Restricted Subsidiary of the Company or on any Indebtedness owed by any
Restricted Subsidiary to the Company or any other Restricted Subsidiary of the
Company. The foregoing limitation does not apply to (i) Liens securing
obligations under the Notes, (ii) Liens securing obligations under the Company
Credit Facility or the Ply Gem Credit Facility (but such Liens shall not secure
Indebtedness in excess of the amount of Indebtedness then permitted to be
incurred under clause (iii) of the second paragraph of the Limitation on
Additional Indebtedness covenant plus the amount of any Indebtedness then
outstanding pursuant to such clause (iii)); (iii) other Liens existing on the
Closing Date; (iv) Liens with respect to the assets of a Restricted Subsidiary
granted by such Restricted Subsidiary to the Company or a Restricted Subsidiary
that is a Wholly-Owned Subsidiary of the Company to secure Indebtedness owing to
the Company or such Wholly-Owned Subsidiary by such Restricted Subsidiary; (v)
Liens permitted by clauses (iv), (v), (x) and (xiv) of the Limitation on
Additional Indebtedness covenant; (vi) Liens in respect of Indebtedness
permitted by clause (xiii) of the Limitation on Additional Indebtedness
covenant; (vii) Liens granted in connection with the extension, renewal or
refinancing, in whole or in part, of any Indebtedness under the Notes or
described in clause (iii) above; provided that (1) such new Indebtedness is
permitted to be incurred under the Limitation on Additional Indebtedness
covenant and (2) the amount of Indebtedness secured by such Lien is not
increased thereby; and provided, further, that the extension, renewal or
refinancing of Indebtedness of the Company may not be secured by Liens on assets
of any Restricted Subsidiary other than to the extent the Indebtedness being
extended, renewed or refinanced was at any time previously secured by Liens on
assets of such Restricted Subsidiary; and (viii) Permitted Liens.
 
                                       78
<PAGE>   80
 
     Limitation on Certain Restrictions Affecting Subsidiaries.  The Company
shall not, and shall not permit any of its Restricted Subsidiaries to, directly
or indirectly, create or enter into or otherwise cause or permit to exist or
become effective any agreement with any Person that would cause any consensual
encumbrance or restriction on the ability of any such Restricted Subsidiary to
(i) pay dividends or make any other distributions on its Capital Stock or any
other interest or participation in, or measured by, its profits, owned by the
Company or any of its Restricted Subsidiaries, (ii) pay or repay any
Indebtedness owed to the Company or any of its Restricted Subsidiaries which
owns Equity Interests in such Restricted Subsidiary, (iii) make loans or
advances to the Company or any of its Restricted Subsidiaries which owns Equity
Interests in such Restricted Subsidiary, (iv) transfer any of its properties or
assets to the Company or any of its Restricted Subsidiaries which owns Equity
Interests in such Restricted Subsidiary or (v) guarantee any Indebtedness of the
Company or any other Restricted Subsidiary of the Company except, in each case,
for such encumbrances or restrictions existing under or by reason of (a)
applicable law, (b) the Indenture, (c) customary nonassignment provisions of any
lease governing a leasehold interest of the Company or any of its Restricted
Subsidiaries, (d) any instrument governing Indebtedness of a Person acquired by
the Company or any of its Restricted Subsidiaries at the time of such
acquisition, which encumbrance or restriction is not applicable to any Person,
or the properties or assets of any Person, other than the Person so acquired,
(e) agreements existing as of the issue date of the Notes, (f) the Company
Credit Facility, (g) the Ply Gem Credit Facility, (h) the Broan Limited Credit
Facility, (i) any other agreement pursuant to which any Restricted Subsidiary of
the Company incurs Indebtedness in accordance with the Limitation on Additional
Indebtedness covenant and (j) any agreement effecting a refinancing of
Indebtedness issued pursuant to any agreement or instrument referred to in
clause (d), (e), (f), (g), (h) or (i) above, provided that the terms and
conditions of any such encumbrances and restrictions are not materially less
favorable to the Holders than those under the agreement or instrument evidencing
the Indebtedness being refinanced.
 
     The foregoing shall not restrict the ability of any Restricted Subsidiary
of the Company to grant any Lien to the extent otherwise permitted in the
Indenture.
 
     Repurchase upon Change of Control.  See "-- Change of Control" above.
 
     Limitation on Use of Proceeds from Asset Sales.  The Company shall not, and
shall not permit any of its Restricted Subsidiaries to, directly or indirectly,
consummate any Asset Sale unless (i) the Company or such Restricted Subsidiary,
as the case may be, receives consideration at the time of any such Asset Sale
having a value (including the Fair Market Value of any non-cash consideration)
at least equal to the Fair Market Value of the securities or assets being sold
or otherwise disposed of, and (ii) at least 75% of the consideration from such
Asset Sale is received in the form of cash, Cash Equivalents (together with
cash, "Cash Proceeds") or indebtedness for borrowed money of the Company or such
Restricted Subsidiary that is assumed by the transferee of any such assets or
any such indebtedness of any Restricted Subsidiary of the Company whose stock is
purchased by the transferee. Any Net Cash Proceeds (a) in excess of the amount
of cash applied by the Company or any Restricted Subsidiary of the Company
during the period beginning 12 months prior to the date of the Asset Sale (but
not prior to the issue date of the Notes) and ending 12 months after the date of
such Asset Sale to purchase any business that is, or any properties and assets
used primarily in, the same or a related business as those owned and operated by
the Company and its Subsidiaries as of the issue date of the Notes or at the
date of such Asset Sale and (b) not applied within 12 months after the date of
the Asset Sale to reduce Indebtedness of the Company (other than Indebtedness
which is subordinated by its terms to the Notes) or any Restricted Subsidiary
shall be deemed to be "Excess Proceeds." When the aggregate amount of Excess
Proceeds exceeds $15,000,000, the Company shall make an offer (the "Excess
Proceeds Offer") to apply the Excess Proceeds to purchase the Notes. The Excess
Proceeds Offer must be in cash in an amount equal to 100% of the principal
amount plus accrued and unpaid interest, if any, thereon and Liquidated Damages,
if any, to the date fixed for the closing of such offer, substantially in
accordance with the procedures for a Change of Control Offer described in the
Repurchase upon Change of Control covenant. To the extent that the aggregate
amount of Notes tendered pursuant to the Excess Proceeds Offer is less than the
Excess Proceeds, the Company may use the remaining Excess Proceeds for general
corporate purposes and such amounts shall no longer be deemed Excess Proceeds.
If the aggregate principal amount of Notes surrendered
 
                                       79
<PAGE>   81
 
by Holders exceeds the amount of Excess Proceeds, the Trustee shall select the
Notes to be purchased on a pro rata basis, subject to the limitation on the
authorized denominations of the Notes.
 
     The Company will comply with the requirements of Rule 14e-1 under the
Exchange Act and any other securities laws and regulations thereunder to the
extent such laws are applicable in connection with the repurchase of Notes
pursuant to an Excess Proceeds Offer.
 
     Limitation on Transactions with Affiliates.  Except as otherwise permitted
by the Indenture, neither the Company nor any of its Restricted Subsidiaries
shall make any Investment, loan, advance, guaranty or capital contribution to,
or for the benefit of, or sell, lease or otherwise transfer or dispose of any of
its properties or assets to, or for the benefit of, or purchase or lease any
property or assets from, or enter into or amend any contract, agreement or
understanding with, or for the benefit of, any Affiliate of the Company or any
of its Restricted Subsidiaries, unless (i) such transaction or series of
transactions is in the best interests of the Company or such Restricted
Subsidiary based on all relevant facts and circumstances; (ii) such transaction
or series of transactions is fair to the Company or such Restricted Subsidiary
and on terms that are no less favorable to the Company or such Restricted
Subsidiary, as the case may be, than those that could have been obtained in a
comparable transaction on an arms' length basis from a Person that is not an
Affiliate of the Company or any of its Restricted Subsidiaries; and (iii) (a)
with respect to a transaction or series of related transactions involving
aggregate payments in excess of $2,500,000, the Board of Directors and a
majority of the Disinterested Directors shall approve such transaction or series
of transactions by a Board Resolution evidencing their determination that such
transaction or series of transactions complies with clauses (i) and (ii) above,
and (b) with respect to a transaction or series of transactions involving
aggregate payments equal to or greater than $10,000,000, the Company receives a
written opinion from a nationally recognized investment bank or valuation firm
or, with respect to a transaction requiring the valuation of real property, a
nationally recognized real estate appraisal firm, that such transaction or
series of transactions is fair to the Company from a financial point of view.
Certain transactions subject to this covenant, such as the repurchase of Capital
Stock from, or an Investment in, an Affiliate of the Company or any of its
Restricted Subsidiaries may also be subject to the Limitation on Restricted
Payments covenant.
 
     The foregoing limitation shall not apply to: (i) any payment of money or
issuance of securities by the Company or any Restricted Subsidiary of the
Company pursuant to employment agreements or arrangements and employee benefit
plans, including reimbursement or advancement of out-of-pocket expenses and
directors' and officers' liability insurance; (ii) reasonable and customary
payments and other benefits (including indemnification) provided to directors
for service on the Board of Directors of the Company or any of its Restricted
Subsidiaries and reimbursement of expenses related thereto; or (iii)
transactions between the Company and any Restricted Subsidiary of the Company,
or between one Restricted Subsidiary of the Company and another Restricted
Subsidiary of the Company, provided that not more than 20% of such Restricted
Subsidiary is owned by any Affiliate of the Company or any of Restricted
Subsidiaries (other than the Company or a Wholly-Owned Subsidiary of the
Company).
 
     Limitation on Guaranties by Subsidiaries.  The Company shall not permit any
Restricted Subsidiary of the Company, directly or indirectly, to assume,
guarantee or in any other manner become liable with respect to any Indebtedness
of the Company (excluding for this purpose, any Indebtedness deemed to arise
from a guarantee by the Company of Indebtedness of any Restricted Subsidiary of
the Company) or any Subsidiary Guarantor (other than the Notes), unless (a) such
liability is in respect of the Company Credit Facility or the Ply Gem Credit
Facility or (b) such Restricted Subsidiary is a Subsidiary Guarantor or
simultaneously executes and delivers (i) to the Company and the Trustee a
supplemental indenture to the Indenture providing for a Subsidiary Guaranty of
the Notes by such Restricted Subsidiary and any other Subsidiary Guarantors
having such terms as are set forth in an exhibit to the Indenture and (ii) to
the Trustee a Subsidiary Guaranty. Notwithstanding the foregoing, in the event
that a Subsidiary Guarantor is released from all obligations which pursuant to
the first sentence of this paragraph would obligate it to become a Subsidiary
Guarantor (if it was not already a Subsidiary Guarantor), such Subsidiary
Guarantor shall be automatically and unconditionally released from all
obligations under its Subsidiary Guaranty without any further action required on
the part of the Trustee or any Holder. In addition, (i) upon the designation of
any Subsidiary Guarantor as an Unrestricted Subsidiary in compliance with the
terms of the Indenture or (ii) upon any sale
 
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<PAGE>   82
 
or disposition (by merger or otherwise) of any Subsidiary Guarantor by the
Company or a Restricted Subsidiary of the Company to any Person that is not an
Affiliate of the Company or any of its Restricted Subsidiaries which is
otherwise in compliance with the terms of the Indenture, such Subsidiary
Guarantor shall be automatically and unconditionally released from all
obligations under its Subsidiary Guaranty without any such further action.
 
     No Lien on the properties or assets of any Restricted Subsidiary of the
Company permitted by the Limitation on Liens covenant shall constitute a
guaranty of the payment of any Indebtedness of the Company for purposes of this
Limitation on Guaranties by Subsidiaries covenant.
 
     The provisions of this Limitation on Guaranties by Subsidiaries covenant
shall cease to have further force and effect (and if there then exists any
Subsidiary Guarantor, such Subsidiary Guarantor will be deemed to be released
from all obligations under its Subsidiary Guaranty) at such time as the similar
covenant in the indentures governing the Company's 9 7/8% Notes, 9 1/4% Notes
and 9 1/8% Notes shall cease to have further force and effect (whether by reason
of amendment, redemption or repayment of such Indebtedness or otherwise),
provided, however, that if the instrument or other agreement governing any
Indebtedness incurred to refinance the 9 7/8% Notes, the 9 1/4% Notes or the
9 1/8% Notes includes such a similar covenant, the provisions of this Limitation
on Guaranties by Subsidiaries covenant shall continue in full force and effect
for so long as such similar covenant remains in force and effect.
 
     Payments for Consents.  Neither the Company nor any of its Subsidiaries
shall, directly or indirectly, pay or cause to be paid any consideration whether
by way of interest, fee or otherwise, to any Holder of any Notes for or as an
inducement to any consent, waiver or amendment of any of the terms or provisions
of the Indenture or the Notes unless such consideration is offered to be paid or
agreed to be paid to all Holders of the Notes which so consent, waive or agree
to amend in the time frame set forth in solicitation documents relating to such
consent, waiver or agreement.
 
     Rule 144A Information Requirement.  The Company has agreed that, if it is
not subject to and in compliance with the informational requirements of Sections
13 or 15(d) of the Exchange Act at any time while the Notes constitute
"restricted securities" within the meaning of the Securities Act, it will
furnish to the holders or beneficial holders of the Notes and prospective
purchasers of the Notes designated by holders of the Notes, upon their request,
the information required to be delivered pursuant to Rule 144A(d)(4) under the
Securities Act until such time as the Company either exchanges all of the Notes
for the Exchange Notes or has registered under the Securities Act and continues
to maintain a registration statement with respect to the resale of all of the
Notes pursuant to the Registration Rights Agreement.
 
     Provision of Reports.  The Indenture provides that whether or not required
by the rules and regulations of the Commission, so long as any Notes are
outstanding, the Company will furnish to the Holders of Notes (i) all quarterly
and annual financial information that would be required to be contained in a
filing with the Commission on Forms 10-Q and 10-K if the Company were required
to file such Forms, including a "Management's Discussion and Analysis of
Financial Condition and Results of Operations" that describes the financial
condition and results of operations of the Company and its Subsidiaries and,
with respect to the annual information only, a report thereon by the Company's
independent certified public accountants and (ii) all reports that would be
required to be filed with the Commission on Form 8-K if the Company were
required to file such reports. In addition, whether or not required by the rules
and regulations of the Commission, the Company will file a copy of all such
information with the Commission for public availability (unless the Commission
will not accept such a filing) and make such information available to investors
or prospective investors who request it in writing.
 
MERGER, CONSOLIDATION OR TRANSFER OF ASSETS
 
     The Company shall not consolidate with, merge with or into, or transfer all
or substantially all of its assets (as an entirety or substantially as an
entirety in one transaction or a series of related transactions) to, any Person
or permit any Person to merge with or into it, or permit any of its Subsidiaries
to enter into any such transaction or transactions if such transaction or
transactions in the aggregate would result in a transfer of all or substantially
all of the assets of the Company and its Subsidiaries on a consolidated basis,
unless: (1) the
 
                                       81
<PAGE>   83
 
Company shall be the continuing Person, or the Person, if other than the
Company, formed by such consolidation or into which the Company is merged or to
which the properties and assets of the Company or of the Company and its
Subsidiaries on a consolidated basis, substantially as an entirety, are
transferred shall be a corporation organized and existing under the laws of the
United States or any state thereof or the District of Columbia and shall
expressly assume, by an indenture supplemental to the Indenture, executed and
delivered to the Trustee, in form satisfactory to the Trustee, all the
obligations of the Company under the Notes and the Indenture, and the Indenture
remains in full force and effect; (2) immediately before and immediately after
giving effect to such transaction, no Event of Default and no Default shall have
occurred and be continuing; (3) the Person which is formed by or survives such
consolidation or merger or to which such assets are transferred (the "surviving
entity"), after giving pro forma effect to such transaction, could incur $1.00
of additional Indebtedness under the first paragraph of the Limitation on
Additional Indebtedness covenant; (4) immediately after giving effect to such
transaction on a pro forma basis the Consolidated Net Worth of the surviving
entity shall be equal to or greater than the Consolidated Net Worth of the
Company immediately before such transaction; and (5) each Subsidiary Guarantor,
if any, unless it is the other party to the applicable transaction described
above or its Subsidiary Guaranty, after giving effect to such transaction, is to
be released in accordance with the terms hereof and of such Subsidiary Guaranty,
shall have confirmed by supplemental indenture that its Subsidiary Guaranty
shall apply to the obligations of the Company or the surviving entity under the
Indenture.
 
     In connection with any such consolidation, merger or transfer, the Company
shall deliver, or cause to be delivered, to the Trustee, in form and substance
reasonably satisfactory to the Trustee, an Officers' Certificate and an opinion
of counsel, each stating that such consolidation, merger or transfer and the
supplemental indenture in respect thereto comply with the Indenture and that all
conditions precedent therein provided for relating to such transactions have
been complied with.
 
     Upon any consolidation or merger, or any transfer of all or substantially
all of the assets of the Company and its Subsidiaries on a consolidated basis,
in accordance with the second preceding paragraph, the successor Person formed
by such consolidation or into which the Company is merged or the successor
Person to which such transfer is made shall succeed to, and be substituted for,
and may exercise every right and power of, the Company under the Indenture with
the same effect as if such successor Person had been named as the Company in the
Indenture, and when a successor Person assumes all the obligations of its
predecessor under the Indenture or the Notes, the predecessor shall be released
from those obligations; provided, however, that in the case of a transfer by
lease, the predecessor shall not be released from the payment of principal of,
premium, if any, interest and Liquidated Damages, if any, on the Notes.
 
     With respect to the transfer of all or substantially all of the assets of
the Company or of the assets of the Company and its Subsidiaries on a
consolidated basis, there is no precise established definition of the term
"substantially all" under applicable law. Accordingly, if the Company were to
engage in transactions in which it disposed of less than all of its assets or
the Company or a Subsidiary of the Company were to engage in transactions in
which less than all of the assets of the Company and its Subsidiaries on a
consolidated basis were disposed of, a question could arise as to whether such
disposition was of "substantially all" of the assets of the Company or of the
Company and its Subsidiaries on a consolidated basis, as the case may be, and,
therefore, whether the transaction was subject to the foregoing provisions of
the Indenture.
 
EVENTS OF DEFAULT AND REMEDIES
 
     The Indenture provides that each of the following constitutes an "Event of
Default": (1) the Company defaults in the payment, when due and payable, of (i)
interest on or Liquidated Damages, if any, with respect to any Note and the
default continues for a period of 30 days, or (ii) principal of or premium, if
any, on any Notes when the same becomes due and payable at maturity, by
acceleration, on the Redemption Date, on the Change of Control Payment Date, on
any payment date respecting an Excess Proceeds Offer or otherwise; (2) the
Company fails to comply with any of the provisions set forth under "Merger,
Consolidation or Transfer of Assets" above; (3) the Company fails to comply with
any of its covenants or agreements in the Notes or the Indenture (other than
those referred to in clause (1) or (2) above), or any Subsidiary Guarantor fails
to comply with any of its covenants or agreements in the Indenture or its
Subsidiary Guaranty, and in
 
                                       82
<PAGE>   84
 
either case such failure continues for the period and after receipt by the
Company of the notice specified below; (4) default under any mortgage, indenture
or instrument under which there may be issued or by which there may be secured
or evidenced any indebtedness for money borrowed by the Company or any of its
Restricted Subsidiaries (or the payment of which is guaranteed by the Company or
any of its Restricted Subsidiaries), whether such indebtedness or guaranty is
now existing or hereafter created, if such default shall constitute a failure to
pay any portion of the principal of such indebtedness when due and payable or if
as a result of such default the maturity of such indebtedness has been
accelerated prior to its stated maturity and, in either case, the principal
amount of such indebtedness, together with the principal amount of any other
such indebtedness for money borrowed which has not been paid when due and
payable or the maturity of which has been accelerated as a result of such
default, aggregates $15,000,000 or more; (5) the Company or any of its
Significant Subsidiaries that is a Restricted Subsidiary (or any group of
Restricted Subsidiaries that, taken together, would constitute a Significant
Subsidiary) pursuant to or within the meaning of any bankruptcy law: (A)
commences a voluntary case or proceeding; (B) consents to the entry of an order
for relief against it in an involuntary case or proceeding; (C) consents to the
appointment of a custodian of it or for all or substantially all of its
property; (D) makes a general assignment for the benefit of its creditors; or
(E) admits in writing its inability to pay its debts generally as they become
due; (6) a court of competent jurisdiction enters an order or decree under any
bankruptcy law that: (A) is for relief against the Company or any of its
Significant Subsidiaries that is a Restricted Subsidiary (or any group of
Restricted Subsidiaries that, taken together, would constitute a Significant
Subsidiary) in an involuntary case or proceeding; (B) appoints a custodian of
the Company or any of its Significant Subsidiaries that is a Restricted
Subsidiary (or any group of Restricted Subsidiaries that, taken together, would
constitute a Significant Subsidiary) for all or substantially all of its
properties; (C) orders the liquidation of the Company or any of its Significant
Subsidiaries that is a Restricted Subsidiary (or any group of Restricted
Subsidiaries that, taken together, would constitute a Significant Subsidiary)
and (D) remains unstayed and in effect for 60 days; (7) final judgments for the
payment of money which in the aggregate exceed $15,000,000 shall be rendered
against the Company or any of its Restricted Subsidiaries by a court and shall
remain unstayed or undischarged for a period of 60 days; or (8) any Subsidiary
Guaranty ceases to be in full force and effect or is declared null and void, or
any Subsidiary Guarantor denies that it has any further liability under any
Subsidiary Guaranty or gives notice to such effect (in each case other than by
reason of the termination of the Indenture or the release of such Subsidiary
Guaranty in accordance with the terms of the Indenture and such Subsidiary
Guaranty) and such condition shall have continued for the period and after
receipt by the Company of the notice specified below.
 
     A Default under clause (3) or (8) above is not an Event of Default until
the Trustee notifies the Company, or the Holders of at least 25% in aggregate
principal amount of the Notes at the time outstanding notify the Company and the
Trustee, of the Default and the Company does not cure such Default within 30
days after receipt of such notice. Any such notice must specify the Default,
demand that it be remedied and state that such notice is a "Notice of Default."
 
     In the case of any Event of Default (other than as a result of the failure
to comply with the Repurchase upon Change of Control covenant) occurring by
reason of any willful action (or inaction) taken (or not taken) by or on behalf
of the Company with the intention of avoiding payment of the premium which the
Company would have to pay if the Company then had elected to redeem the Notes,
an equivalent premium shall also become and be immediately due and payable to
the extent permitted by law, anything in the Indenture or in the Notes contained
to the contrary notwithstanding.
 
     In the case of an Event of Default as a result of a failure to comply with
the Repurchase upon Change of Control covenant occurring by reason of any
willful action (or inaction) taken (or not taken) by or on behalf of the Company
with the intention of avoiding payment of the premium which the Company would
have to pay pursuant to the Repurchase upon Change of Control covenant, such
premium shall also become and be immediately due and payable at such time as the
principal and interest on the Notes become due and payable pursuant to the
acceleration provisions of the Indenture to the extent permitted by law,
anything in the Indenture or in the Notes contained to the contrary
notwithstanding.
 
     If any Event of Default (other than an Event of Default specified in clause
(5) or (6) above) occurs and is continuing, the Trustee or the Holders of at
least 25% of the principal amount of the Notes then
 
                                       83
<PAGE>   85
 
outstanding, by written notice to the Company (and to the Trustee if such notice
is given by such Holders), may, and such Trustee at the request of such Holders
shall, declare all unpaid principal of, premium, if any, and accrued interest on
and Liquidated Damages, if any, with respect to the Notes to be due and payable
immediately. If an Event of Default specified in clause (5) or (6) above occurs,
all unpaid principal of, premium, if any, and accrued interest on and Liquidated
Damages, if any, with respect to the Notes then outstanding shall ipso facto
become and be immediately due and payable without declaration or other act on
the part of the Trustee or any Holder. The Holders of at least a majority in
principal amount of the Notes then outstanding by written notice to the Trustee
may rescind an acceleration and its consequences (except an acceleration due to
default in payment of principal of, premium, if any, and accrued interest on and
Liquidated Damages, if any, with respect to, the Notes) if all existing Events
of Default have been cured or waived except non-payment of principal of,
premium, if any, and accrued interest on and Liquidated Damages, if any, with
respect to, the Notes that have become due solely because of the acceleration.
Subject to certain restrictions set forth in the Indenture, the Holders of at
least a majority in principal amount of the outstanding Notes by notice to the
Trustee may waive an existing Default or Event of Default and its consequences,
except a default in the payment of principal of, premium, if any, or interest
on, or Liquidated Damages, if any, with respect to any Note or a Default under a
provision which requires consent of all Holders to amend. When a Default or
Event of Default is waived, it is cured and ceases. A Holder of Notes may not
pursue any remedy with respect to the Indenture or the Notes unless: (i) the
Holder gives to the Trustee written notice that an Event of Default is
continuing; (ii) the Holders of at least 25% in aggregate principal amount of
any Notes outstanding make a written request to the Trustee to pursue the
remedy; (iii) such Holder or Holders offer to the Trustee reasonable indemnity
or security against any loss, liability or expense satisfactory to the Trustee;
(iv) the Trustee does not comply with the request within 30 days after receipt
of the request and the offer of indemnity or security; and (v) during such
30-day period the Holders of a majority in aggregate principal amount of the
outstanding Notes do not give the Trustee a direction which is inconsistent with
the request.
 
DISCHARGE OF THE INDENTURE AND THE NOTES
 
     If, at any time prior to the Stated Maturity of the Notes or the date of
redemption of all outstanding Notes, the Company irrevocably deposits with the
Trustee money and/or direct non-callable obligations of, or non-callable
obligations guaranteed by, the United States of America for the payment of which
guarantee or obligation the full faith and credit of the United States is
pledged, maturing as to principal and interest in such amounts and at such times
as are sufficient, without consideration of any reinvestment of such interest,
to pay principal of, premium, if any, and accrued interest on and Liquidated
Damages, if any, with respect to, the outstanding Notes (other than replaced
Notes) to maturity or redemption, as the case may be, in accordance with the
terms of the Indenture and the Notes, the Indenture and each Subsidiary
Guaranty, if any, shall cease to be of further effect as to all outstanding
Notes (except, among other things, as to (i) remaining rights of registration of
transfer and substitution and exchange of the Notes, (ii) rights of Holders to
receive payment of principal of, premium, if any, and accrued interest on and
Liquidated Damages, if any, with respect to the Notes, and (iii) the rights,
obligation and immunities of the Trustee); provided, however, that the Company
will only be entitled to make such a deposit if the Company has delivered to the
Trustee, among other things, (x)(1) a ruling directed to the Trustee from the
Internal Revenue Service to the effect that the holders of the Notes will not
recognize income, gain or loss for federal income tax purposes as a result of
such deposit and defeasance of this Indenture and will be subject to federal
income tax on the same amount and in the same manner and at the same times, as
would have been the case if such deposit and defeasance had not occurred, or (2)
an opinion of counsel, reasonably satisfactory to the Trustee to the same effect
as clause (x)(1) above and (y) a report from a nationally recognized firm of
independent public accountants stating that the amount of such deposit is
sufficient to pay and discharge the amounts described above with respect to the
Notes.
 
TRANSFER AND EXCHANGE
 
     A Holder may transfer or exchange Notes in accordance with the Indenture.
The Registrar may require a Holder, among other things, to furnish appropriate
endorsements and transfer documents, and to pay any taxes and fees required by
law or permitted by the Indenture. The Registrar is not required to transfer or
exchange
 
                                       84
<PAGE>   86
 
any Note selected for redemption. Also, the Registrar is not required to
transfer or exchange any Note for a period of 15 days before a selection of
Notes to be redeemed.
 
     The registered Holder of a Note will be treated as the owner of it for all
purposes.
 
AMENDMENT, SUPPLEMENT AND WAIVER
 
     Subject to certain exceptions, with the written consent of the Holders of
at least a majority in aggregate principal amount of the Notes then outstanding,
the Company and the Trustee may amend the Indenture or the Notes, or may waive
compliance by the Company or any Subsidiary Guarantor with any provision of the
Indenture, the Notes or such Subsidiary Guarantor's Subsidiary Guaranty.
However, without the consent of each Holder affected, a waiver or an amendment
to the Indenture or the Notes may not: (i) reduce the percentage of principal
amount of the Notes whose Holders must consent to an amendment or waiver; (ii)
make any change to the Stated Maturity of the principal of, premium, if any, or
any interest on or Liquidated Damages, if any, with respect to, the Notes or any
Redemption Price thereof, or impair the right to institute suit for the
enforcement of any such payment or make any Note payable in money or securities
other than that stated in the Note; (iii) waive a default in the payment of the
principal of, premium, if any, or interest on, or Liquidated Damages, if any,
with respect to, any Note; (iv) make any change in the provisions of the
Repurchase upon Change of Control covenant or the Limitation on Use of Proceeds
of Asset Sales covenant; (v) release any Subsidiary Guarantor from any of its
obligations under its Subsidiary Guaranty or the Indenture other than in
compliance with the terms of the Indenture and such Subsidiary Guaranty; or (vi)
make any change in the amendment provisions of the Indenture.
 
     Notwithstanding the foregoing, without the consent of any Holder, the
Company and the Trustee may amend or supplement the Indenture or the Notes (i)
to cure any ambiguity, defect or inconsistency; (ii) to comply with the
provisions described under "Merger, Consolidation or Transfer of Assets"; (iii)
to provide for uncertificated Notes in addition to or in place of certificated
Notes so long as such uncertificated Notes are in registered form for purposes
of the Internal Revenue Code of 1986, as amended; (iv) to make any other change
that does not adversely affect the rights of any Holder; (v) to comply with any
requirement of the Commission in connection with the qualification of the
Indenture under the Trust Indenture Act; or (vi) to add any Subsidiary of the
Company as a Subsidiary Guarantor.
 
CONCERNING THE TRUSTEE
 
     State Street Bank and Trust Company is the Trustee under the Indenture and
has been appointed by the Company as Registrar and Paying Agent with respect to
the Notes.
 
     The Indenture contains certain limitations on the rights of the Trustee,
should it become a creditor of the Company, to obtain payment of claims in
certain cases, or to realize certain property received in respect of any such
claim as security or otherwise. The Trustee will be permitted to engage in other
transactions; however, if it acquires any conflicting interest it must eliminate
such conflict within 90 days, or apply to the Commission for permission to
continue or resign.
 
     The Holders of not less than a majority in principal amount of the then
outstanding Notes will have the right to direct the time, method and place of
conducting any proceeding for exercising any remedy available to the Trustee,
subject to certain exceptions. The Indenture provides that in case an Event of
Default shall occur and be continuing (and shall not be cured), the Trustee will
be required, in the exercise of its power, to use the degree of care and skill
of a prudent person in the conduct of his own affairs. Subject to such
provisions, the Trustee will be under no obligation to exercise any of its
rights or powers under the Indenture at the request of any Holders of Notes,
unless they shall have offered to the Trustee reasonable security or indemnity
satisfactory to it against any loss, liability or expense.
 
                                       85
<PAGE>   87
 
CERTAIN DEFINITIONS
 
     Set forth below are certain defined terms used in the Indenture. Reference
is made to the Indenture for full disclosure of all such terms, as well as any
other capitalized terms used herein for which no definition is provided.
 
     "Acquired Indebtedness" means, with respect to any Person, Indebtedness of
such Person (i) assumed in connection with an acquisition of assets or
properties from such Person or (ii) existing at the time such Person becomes a
Restricted Subsidiary of any other Person provided such Person was not
immediately prior thereto an Unrestricted Subsidiary (in each case other than
any Indebtedness incurred in connection with, or in contemplation of, such
acquisition or such Person becoming such a Restricted Subsidiary).
 
     "Affiliate" means, with respect to any Person, any other Person directly or
indirectly controlling or controlled by or under direct or indirect common
control with such specified Person. A Person shall be deemed to "control"
(including the correlative meanings, the terms "controlling", "controlled by"
and "under common control with") another Person if the controlling Person
possesses, directly or indirectly, the power to direct or cause the direction of
the management or policies of the controlled Person, whether through ownership
of voting securities, by agreement or otherwise.
 
     "Allowable Subsidiary Loans" means Indebtedness of the Company to a
Restricted Subsidiary not to exceed the Net Cash Proceeds received by the
Company as a result of such Restricted Subsidiary becoming less than a
Wholly-Owned Subsidiary through the sale of Equity Interests in compliance with
the terms of the Indenture, provided that (i) all such Allowable Subsidiary
Loans are contractually subordinated in right of payments to the Notes and (ii)
the total amount of all Allowable Subsidiary Loans at any time outstanding does
not exceed $35,000,000.
 
     "Asset Sale" means, with respect to any Person, the sale, lease, conveyance
or other transfer or disposition by such Person of any of its assets or
properties (including by way of a sale-and-leaseback and including the sale,
issuance or other transfer of any of the Capital Stock of any Subsidiary of such
Person), in a single transaction or through a series of related transactions,
for aggregate consideration received by such Person or a Subsidiary of such
Person (but if such Person is the Company or any Restricted Subsidiary, only if
such Subsidiary is a Restricted Subsidiary), net of out-of-pocket costs relating
thereto (including, without limitation, legal, accounting and investment banking
fees and sales commissions), in excess of $5,000,000. For purposes of this
definition, consideration shall include, without limitation, any indebtedness
for borrowed money of such Person or such Subsidiary that is assumed by the
transferee of any assets or any such indebtedness of any Subsidiary of such
Person whose stock is purchased by the transferee. Notwithstanding anything to
the contrary in the foregoing provisions of this definition, the term "Asset
Sale", with respect to any Person, shall not include (i) the sale, lease or
other transfer or disposition of assets acquired and held for resale in the
ordinary course of business; (ii) the sale, lease or other transfer or
disposition of assets in accordance with the provisions described under "Merger,
Consolidation or Transfer of Assets"; (iii) the sale, lease or other transfer or
disposition of damaged, worn out or obsolete property in the ordinary course of
business or other property no longer necessary for the proper conduct of the
business of such Person or its Subsidiaries; (iv) the abandonment of assets or
properties which are no longer useful in the business of such Person or its
Subsidiaries and are not readily saleable; (v) the granting of any Lien
permitted under the Limitation on Liens covenant (and any foreclosure or other
sale under any such Lien, except to the extent there are surplus proceeds from
such foreclosure); (vi) any sale, lease, assignment or other disposition by such
Person or its Subsidiaries if such Person has outstanding senior debt securities
all of which are rated BBB- or higher by S&P and have not been placed on credit
watch by S&P for a possible downgrade or are rated Baa3 or higher by Moody's and
have not been placed on credit watch by Moody's for a possible downgrade; or
(vii) the sale or other transfer or disposition of receivables in connection
with an asset securitization transaction by such Person or its Subsidiaries.
 
     "Average Life" means, as of the date of determination, with respect to any
debt security, the quotient obtained by dividing (i) the sum of the products of
the number of years from the date of determination to the date of each
successive scheduled principal payment (assuming the exercise by the obligor of
such debt security of all unconditional (other than as to the giving of notice)
extension options of each such scheduled
 
                                       86
<PAGE>   88
 
payment date) of such debt security multiplied by the amount of such principal
payment by (ii) the sum of all such principal payments.
 
     "Broan Limited Credit Facility" means a credit facility between Broan
Limited or any of the Canadian Subsidiaries, and one or more banks or other
institutional lenders, as the same may be amended, extended, amended and
restated, supplemented or otherwise modified or replaced from time to time.
 
     "Canadian Subsidiary" means any Subsidiary of Broan Limited and any
Subsidiary of the Company whose headquarters is located in Canada.
 
     "Capital Lease Obligations" means, with respect to any Person, all
obligations under leases of property by such Person as lessee which would be
capitalized on a balance sheet of such Person prepared in accordance with GAAP,
and for purposes of the Indenture the amount of such obligations at any time
shall be the aggregate capitalized amount thereof at such time, as determined in
accordance with GAAP.
 
     "Capital Stock" means, with respect to any Person, any and all shares,
interests, participations, rights or other equivalents (however designated) of
capital stock (including common or preferred stock), partnership interests or
any other participation right or other interest in the nature of an equity
interest in such Person.
 
     "Cash Equivalents" means (i) any evidence of Indebtedness, maturing not
more than 365 days after the date of acquisition, issued or fully guaranteed or
insured by the United States of America, or an instrumentality or agency thereof
(provided that the full faith and credit of the United States of America is
pledged in support thereof), (ii) any certificate of deposit, overnight bank
deposit or bankers' acceptance, maturing not more than 365 days after the date
of acquisition, issued by, or time deposit of, a commercial banking institution
having unsecured long-term debt (or whose holding company has unsecured
long-term debt) rated, at the time as of which any Investment therein is made,
BBB- or better by S&P or Moody's or the equivalent of such rating by a successor
rating agency, (iii) commercial paper, maturing not more than 90 days after the
date of acquisition, issued by a corporation (other than an Affiliate or
Subsidiary of the Company) organized and existing under the laws of the United
States of America or any State thereof or the District of Columbia which is
rated, at the time as of which any Investment therein is made, P-1 or better by
Moody's or A-1 or better by S&P, or the equivalent of such rating by a successor
rating agency, (iv) Investments in mutual funds, money market funds, investment
pools and other savings vehicles, substantially all of the assets of which are
invested in Investments described in clause (i), (ii) or (iii) above, and (v) in
the case of Broan Limited and the Canadian Subsidiaries, (a) any evidence of
Indebtedness, maturing not more than 365 days after the date of acquisition,
issued or fully guaranteed or insured by Canada or any instrumentality or agency
thereof (provided that the full faith and credit of Canada is pledged in support
thereof), (b) any certificate of deposit, overnight bank deposit or bankers'
acceptance, maturing not more than 365 days after the date of acquisition,
issued by, or time deposit of, a commercial banking institution having unsecured
long-term debt (or whose holding company has unsecured long-term debt) rated, at
the time as of which any Investment therein is made, A or better by Dominion
Bond Rating Services or the equivalent of such rating by a successor rating
agency and (c) commercial paper, maturing not more than 90 days after the date
of acquisition, issued by a corporation (other than an Affiliate or Subsidiary
of the Company) organized and existing under the laws of Canada or any province
thereof which is rated, at the time as of which any Investment therein is made,
R-1 or better by Dominion Bond Rating Services or the equivalent of such rating
by a successor rating agency.
 
     "Commodity Agreement" means any agreement or arrangement designed to
protect the Company or any of its Restricted Subsidiaries against fluctuations
in the prices of commodities used by the Company or any of its Subsidiaries in
the ordinary course of business.
 
     "Company Credit Facility" means one or more credit facilities (other than
the Ply Gem Credit Facility) between the Company or any of its Subsidiaries and
one or more banks or other institutional lenders, as the same may be amended,
extended, amended and restated, supplemented or otherwise modified or replaced
from time to time, specifically designated in each such credit facility as a
"Company Credit Facility." All Company Credit Facilities are referred to
collectively in the Indenture as the "Company Credit Facility."
 
                                       87
<PAGE>   89
 
     "Consolidated Amortization Expense" means, with respect to any Person for
any period, the amortization expense of such Person and its Subsidiaries (or if
such Person is the Company, the amortization expense of the Company and its
Restricted Subsidiaries), determined on a consolidated basis for such period in
accordance with GAAP, excluding any amortization expense included in
Consolidated Interest Expense.
 
     "Consolidated Cash Flow" means, with respect to any Person for any period,
the sum of, without duplication, (i) Consolidated Net Income of such Person for
such period, (ii) Consolidated Interest Expense of such Person for such period,
(iii) Consolidated Income Tax Expense of such Person for such period, (iv)
Consolidated Depreciation Expense of such Person for such period, (v)
Consolidated Amortization Expense of such Person for such period , and (vi) the
amount, not to exceed 10% of Consolidated Cash Flow of such Person for such
period (which amount shall be excluded in determining such Consolidated Cash
Flow), by which (A) other non-cash items of expense that reduce Consolidated Net
Income of such Person for such period exceed (B) other non-cash items of expense
that increase Consolidated Net Income of such Person for such period.
 
     "Consolidated Cash Flow Coverage Ratio" means, with respect to any Person
for any period, the ratio of Consolidated Cash Flow of such Person for such
period to Consolidated Interest Expense of such Person for such period;
provided, however, that, Consolidated Cash Flow and Consolidated Interest
Expense shall be calculated on a pro forma basis after giving effect, as if
occurring at the beginning of such period, to (i) the incurrence of Indebtedness
giving rise to the need to calculate the Consolidated Cash Flow Coverage Ratio
and the retirement of any Indebtedness refinanced with the proceeds of such
Indebtedness, (ii) the incurrence, during such period or since the last day of
such period, of any Indebtedness (other than Indebtedness incurred for working
capital purposes), and the retirement of any Indebtedness refinanced with the
proceeds of such Indebtedness, (iii) the acquisition by such Person (directly or
through a Restricted Subsidiary of such Person if such Person is the Company and
directly or through a Subsidiary of such Person if such Person is not the
Company) of any company or business during such period or since the last day of
such period and (iv) the sale or other disposition of assets or properties
outside the ordinary course of business by such Person (directly or through a
Restricted Subsidiary of such Person if such Person is the Company and directly
or through a Subsidiary of such Person if such Person is not the Company) and
the actual application of the proceeds therefrom during such period or since the
last day of such period.
 
     "Consolidated Depreciation Expense" means, with respect to any Person for
any period, the depreciation and depletion expense of such Person and its
Subsidiaries (or if such Person is the Company, the depreciation and depletion
expense of the Company and its Restricted Subsidiaries), determined on a
consolidated basis for such period in accordance with GAAP.
 
     "Consolidated Income Tax Expense" means, with respect to any Person for any
period, the provision for federal, state, local and foreign income taxes
(including franchise, net worth or similar taxes) of such Person and its
Subsidiaries (or if such Person is the Company, the provision for such taxes of
the Company and its Restricted Subsidiaries) for such period, determined on a
consolidated basis in accordance with GAAP.
 
     "Consolidated Interest Expense" means, with respect to any Person for any
period, without duplication, the sum of (i) the interest expense of such Person
and its Subsidiaries (or if such Person is the Company, the interest expense of
the Company and its Restricted Subsidiaries) for such period, determined on a
consolidated basis in accordance with GAAP, including, without limitation, all
original issue discount and other interest portion of any deferred payment
Indebtedness and all commissions, discounts and other fees and charges owed with
respect to letters of credit and bankers' acceptance financing less any interest
income included in Consolidated Net Income for such period, but excluding any
deferred financing fees otherwise includible in Consolidated Interest Expense
for such period; (ii) the interest component of Capital Lease Obligations paid,
accrued and/or scheduled to be paid or accrued by such Person and its
Subsidiaries (or if such Person is the Company, such interest expense paid,
accrued and/or scheduled to be paid or accrued by the Company and its Restricted
Subsidiaries) during such period as determined on a consolidated basis in
accordance with GAAP; and (iii) all cash dividends or other distributions
declared or paid on any Capital Stock (other than common stock or preferred
stock that is not Redeemable Stock or, with respect to the Company, Special
Common Stock) of such Person and its Subsidiaries (or if such Person is the
Company, all
 
                                       88
<PAGE>   90
 
such dividends or other distributions declared or paid on any such Capital Stock
of the Company and its Restricted Subsidiaries) for such period as determined on
a consolidated basis in accordance with GAAP; provided, however, that any
Indebtedness bearing a floating rate of interest shall be computed as if the
rate in effect on the date of computation had been the applicable rate for the
entire period.
 
     "Consolidated Net Income" means, with respect to any Person for any period,
the aggregate net income (or loss) of such Person and its Subsidiaries (or if
such Person is the Company, the aggregate net income (or loss) of the Company
and its Restricted Subsidiaries) for such period, before discontinued
operations, extraordinary items and the cumulative effect of a change in
accounting principles, determined on a consolidated basis in accordance with
GAAP, provided that there shall also be excluded from Consolidated Net Income
(but only to the extent included in calculating such Consolidated Net Income):
(i) any net gains or losses in respect of dispositions of assets other than in
the ordinary course of business; (ii) any gains from currency exchange
transactions not in the ordinary course of business consistent with past
practice; (iii) any gains or losses realized from the termination of any
employee pension benefit plan; (iv) any gains or losses realized upon the
refinancing of any Indebtedness of such Person or any of its Subsidiaries (or if
such Person is the Company, any gains or losses realized upon the refinancing of
any Indebtedness of Company and its Restricted Subsidiaries); (v) any gains or
losses arising from the destruction of property or assets due to fire or other
casualty; (vi) any gains or losses from the revaluation of property or assets;
(vii) the net income (or loss) of any Person that is not a Subsidiary of such
first Person (or that is not a Restricted Subsidiary if such first Person is the
Company) except to the extent of cash dividends or distributions paid to such
first Person by such other Person in such period; (viii) the net income (or
loss) of any Subsidiary of such first Person except to the extent of the
interest of such Person in such Subsidiary; (ix) the net income of any
Subsidiary of such Person (or if such Person is the Company, of any Restricted
Subsidiary) that is subject to any restriction or limitation on the payment of
dividends and other distributions (including loans or advances) by operation of
the terms of its charter or by agreement, instrument, judgment, decree, order or
governmental regulation applicable to such Subsidiary (or such Restricted
Subsidiary, if applicable) to the extent of such restriction or limitation in
such period; (x) the net income of any Person acquired in a pooling transaction
for any period prior to the date of such acquisition; and (xi) the excess of (a)
the consolidated compensation expense recorded by the Company in the computation
of net earnings of the Company in respect of shares of Capital Stock (other than
Redeemable Stock) or other Equity Interests awarded, pursuant to a plan or other
arrangement approved by the Board of Directors of the Company (or of a Reporting
Subsidiary, if applicable), to or for the benefit of any employee, officer or
director of the Company or any of its Subsidiaries or to or by any employee
stock ownership plan or similar trust for the benefit of any such employee,
officer or director, over (b) the amount of consolidated income tax benefit
recorded by the Company in connection with such consolidated compensation
expense of the Company.
 
     "Consolidated Net Worth" means, with respect to any Person at any date of
determination, the sum of the Capital Stock, additional paid-in capital and
cumulative translation, pension and other adjustment account plus retained
earnings (or minus accumulated deficit), excluding amounts attributable to
Redeemable Stock, any Capital Stock convertible into Indebtedness, or Treasury
Stock, of such Person and its Restricted Subsidiaries, determined on a
consolidated basis in accordance with GAAP.
 
     "Currency Agreement" means any foreign exchange contract, currency swap
agreement or other similar agreement or arrangement entered into in the ordinary
course of business and designed to protect the Company or any of its Restricted
Subsidiaries against fluctuations in currency values to or under which the
Company or any of its Restricted Subsidiaries is a party or a beneficiary on the
issue date of the Notes or becomes a party or a beneficiary thereafter.
 
     "Default" means any event which is, or after notice or passage of time or
both would be, an Event of Default.
 
     "Disinterested Director" means, with respect to any transaction or series
of transactions in respect of which the Board of Directors of the Company is
required to deliver a Board Resolution under the Indenture, a member of such
Board of Directors who does not have any material direct or indirect financial
interest in or with respect to such transaction or series of transactions.
 
                                       89
<PAGE>   91
 
     "Eligible Inventory" means, with respect to any Person, the finished goods,
raw materials and work-in-process of such Person less any applicable reserves,
each of the foregoing determined on the FIFO method of accounting in accordance
with GAAP.
 
     "Eligible Receivables" means, with respect to any Person, the trade
receivables of such Person less the allowance for doubtful accounts, each of the
foregoing determined in accordance with GAAP.
 
     "Equity Interests" means Capital Stock, warrants, options or other rights
to acquire Capital Stock (but excluding any debt security which is convertible
into, or exchangeable for, Capital Stock).
 
     "Exempt Person" means (i) Richard L. Bready, (ii) any Person which is an
Affiliate of Richard L. Bready, and (iii) any other Affiliate of such Person so
long as such Person is an Affiliate of Richard L. Bready.
 
     "Existing Indebtedness" means Indebtedness of the Company and its
Restricted Subsidiaries, in existence on the issue date of the Notes, including
without limitation all Indebtedness outstanding under the Ply Gem Credit
Facility on such date.
 
     "Existing Investments" means (i) Investments of the Company and its
Restricted Subsidiaries, in existence on the issue date of the Notes and (ii)
Investments to be made pursuant to commitments authorized by the Board of
Directors of the Company prior to the issue date of the Notes in Ecological
Engineering Associates, L.P. in an amount not to exceed $3.0 million (including
such Investments made prior to the issue date of the Notes).
 
     "Fair Market Value" means, with respect to any asset, the price which could
be negotiated in an arm's-length free market transaction, for cash, between a
willing seller and a willing buyer, neither of which is under pressure or
compulsion to complete the transaction; provided, however, that the Fair Market
Value of any asset or assets of the Company or any of its Subsidiaries shall be
determined by the Board of Directors of the Company or, if such subsidiary is a
Reporting Subsidiary, of such Reporting Subsidiary, acting in good faith, and
evidenced by a Board Resolution of the Company or such Reporting Subsidiary, as
the case may be, delivered to the Trustee.
 
     "GAAP" means generally accepted accounting principles set forth in the
opinions and pronouncements of the Accounting Principles Board of the American
Institute of Certified Public Accountants and statements and pronouncements of
the Financial Accounting Standards Board or in such other statements by such
other entity as approved by a significant segment of the accounting profession,
from time to time; provided, however, that with respect to the obligations of
the Company described under "Certain Covenants" and "Merger, Consolidation or
Transfer of Assets" and the definitions used therein, GAAP shall be determined
on the basis of such principles as in effect on the issue date of the Notes.
 
     "Indebtedness" means, with respect to any Person, without duplication, any
indebtedness, contingent or otherwise, (i) with respect to borrowed money
(whether or not the recourse of the lender is to the whole of the assets of such
Person or only to a portion thereof), or evidenced by bonds, notes, debentures
or similar instruments or consisting of reimbursement obligations with respect
to letters of credit, or (ii) representing the deferred and unpaid balance of
the purchase price of any property excluding any such balance that constitutes a
trade payable or an accrued liability, in each case arising in the ordinary
course of business, if and to the extent any of the foregoing indebtedness would
appear as a liability upon a balance sheet of such Person prepared on a
consolidated basis in accordance with GAAP, and shall also include, to the
extent not otherwise included, (a) any Capital Lease Obligations, (b) the
maximum fixed repurchase price of any Redeemable Stock, (c) indebtedness secured
by a Lien to which the property or assets owned or held by such Person is
subject, whether or not the obligations secured thereby shall have been assumed,
(d) guaranties of items that would be included within this definition to the
extent of such guaranties, and (e) net liabilities in respect of Commodity
Agreements, Currency Agreements and Interest Rate Agreements. For purposes of
the immediately preceding sentence, the maximum fixed repurchase price of any
Redeemable Stock which does not have a fixed repurchase price shall be
calculated in accordance with the terms of such Redeemable Stock as if such
Redeemable Stock were repurchased on any date on which Indebtedness shall be
required to be determined pursuant to the Indenture, provided that if such
Redeemable Stock is not then permitted to be repurchased, the repurchase price
shall be the book value of such Redeemable Stock. The amount of
 
                                       90
<PAGE>   92
 
Indebtedness of any Person at any date shall be without duplication (y) the
outstanding balance at such date of all unconditional obligations as described
above and the maximum liability of any such contingent obligations at such date
and (z) in the case of Indebtedness of others secured by a Lien to which the
property or assets owned or held by such Person is subject, the lesser of the
Fair Market Value at such date of any property or asset subject to a Lien
securing the Indebtedness of others or the amount of the Indebtedness secured.
The amount of any Indebtedness issued at a discount shall be equal to the gross
proceeds of such issuance (and not the face amount of any bond, note, debenture
or similar instrument representing such Indebtedness).
 
     "Interest Rate Agreement" means any interest rate protection agreement,
interest rate future agreement, interest rate option agreement, interest rate
swap agreement, interest rate cap agreement, interest rate collar agreement,
interest rate hedge agreement, or other similar agreement or arrangement entered
into in the ordinary course of business and designed to protect the Company or
any of its Restricted Subsidiaries against fluctuations in interest rates to or
under which the Company or any of its Restricted Subsidiaries is a party or a
beneficiary thereof.
 
     "Investment" means, with respect to any Person, (i) any direct or indirect
loan or other extension of credit (other than extensions of trade credit by such
Person on commercially reasonable terms and relating to the sale of property or
services in the ordinary course of business) or capital contribution (by means
of any transfer of cash or other property to others or any payment for property
or services for the account or use of others) to any other Person, or (ii) any
purchase or acquisition by such Person of any Capital Stock, bonds, notes,
debentures or other securities or evidences of Indebtedness issued by any other
Person.
 
     "Lien" means any mortgage, lien, pledge, charge, security interest or
encumbrance of any kind, whether or not filed, recorded or otherwise perfected
under applicable law (including any conditional sale or other title retention
agreement, any lease intended as security, any option or other agreement to sell
or give any security interest and any filing of or other agreement to give any
financing statement under the Uniform Commercial Code (or equivalent statutes)
of any jurisdiction other than a financing statement covering leased goods under
a lease not intended as security).
 
     "Liquidated Damages" means all liquidated damages then owing pursuant to
the Registration Rights Agreement.
 
     "Net Cash Proceeds" means the aggregate Cash Proceeds received by the
Company or any of its Restricted Subsidiaries in respect of any Asset Sale, net
of the out-of-pocket costs relating to such Asset Sale (including, without
limitation, legal, accounting and investment banking fees and sales commissions)
and any relocation expenses and severance and shutdown costs incurred as a
result thereof, and all federal, state, provincial, foreign and local taxes
required to be accrued as a liability under GAAP as a consequence of such Asset
Sale, amounts required to be applied to the repayment of Indebtedness secured by
a Lien on the asset or assets which are the subject of such Asset Sale and any
reasonable reserve in accordance with GAAP for adjustments in respect of the
sale price of such asset or assets.
 
     "Non-Recourse Debt" means Indebtedness (i) as to which neither the Company
or any of its Restricted Subsidiaries (a) provides credit support of any kind
(including any undertaking, agreement or instrument that would constitute
Indebtedness), (b) is directly or indirectly liable (as a guarantor or
otherwise), or (c) constitutes the lender; (ii) no default with respect to which
(including any rights that the holders thereof may have to take enforcement
action against an Unrestricted Subsidiary) would permit (upon notice, lapse of
time or both) any holder of any other Indebtedness of the Company or any of its
Restricted Subsidiaries to declare a default on such other Indebtedness or cause
the payment thereof to be accelerated or payable prior to its stated maturity;
and (iii) as to which the lenders have been notified in writing that they will
not have any recourse to the stock or assets of the Company or any of its
Restricted Subsidiaries.
 
     "Notes" means any of the Company's 8 7/8% Senior Notes due August 1, 2008
issued under the Indenture.
 
     "Officers' Certificate" means, with respect to any Person, a certificate
signed by the Chief Executive Officer or President and the Chief Financial
Officer or chief accounting officer of such Person.
 
                                       91
<PAGE>   93
 
     "Permitted Investments" means any of the following: (i) Cash Equivalents;
(ii) Existing Investments; (iii) Investments by the Company or a Restricted
Subsidiary of the Company in any Subsidiary of the Company that is a Restricted
Subsidiary or any other Person that concurrently with the making of such
Investment becomes a Subsidiary of the Company that is a Restricted Subsidiary;
(iv) guaranties by Restricted Subsidiaries of the Company permitted under the
Limitation on Additional Indebtedness covenant and the Limitation on Guaranties
by Subsidiaries covenant; (v) Indebtedness of the Company to any Restricted
Subsidiary of the Company, provided that such Indebtedness is contractually
subordinated in right of payment to the Notes; (vi) Investments by the Company
or any of its Restricted Subsidiaries in debt securities or debt instruments
having maturities of 10 years or less and (A) issued or fully guaranteed or
insured by the United States of America, or an instrumentality or agency thereof
(provided that the full faith and credit of the United States of America is
pledged in support thereof) or (B) with a rating of BBB- or better by S&P or
Baa-3 or better by Moody's or the equivalent of such rating by a successor
rating agency; (vii) any Investment by Broan Limited and or any Canadian
Subsidiary in debt securities or debt instruments having maturities of 10 years
or less and issued or fully guaranteed or insured by Canada or an
instrumentality or agency thereof or rated, at the time of such Investment, BBB-
or better by Dominion Bond Rating Services or the equivalent of such rating by a
successor rating agency, so long as the aggregate amount of all such Investments
by Broan Limited and any Canadian Subsidiaries that are Restricted Subsidiaries
does not exceed $15,000,000 at any one time outstanding; (viii) loans and
advances to officers and directors of the Company or any Restricted Subsidiary
of the Company made in the ordinary course of business or pursuant to any
employee benefit plan, up to $5,000,000 in the aggregate at any one time
outstanding; (ix) loans and advances to vendors, suppliers and contractors of
the Company or any Restricted Subsidiary of the Company and made in the ordinary
course of business; (x) the receipt by the Company or its Restricted
Subsidiaries of consideration other than Cash Proceeds in any Asset Sale made in
compliance with the terms of the Indenture; (xi) so long as no Default or Event
of Default shall have occurred and be continuing, other Investments made after
the issue date of the Notes not exceeding in the aggregate at any time
outstanding (A) $40,000,000, if at the time of the making of such Investment the
Notes are not rated BB+ or better by S&P or Bal or better by Moody's, or (B)
$50,000,000, if at the time of the making of such Investment the Notes are rated
BB+ or better by S&P or Bal or better by Moody's; (xii) any Lien permitted under
the Limitation on Liens covenant; and (xiii) Investments by Restricted
Subsidiaries of the Company not exceeding in the aggregate $10,000,000 at any
one time outstanding in Cash Equivalents described in clause (ii) of the
definition of such term in the Indenture, provided that for purposes of this
clause (xiii) an instrument referred to in such clause (ii) may be issued by any
commercial banking institution having capital and surplus of not less than
$100,000,000.
 
     "Permitted Liens" means (i) Liens for taxes, assessments, governmental
charges or claims that are not yet due or are being contested in good faith by
appropriate legal proceedings, provided that any reserve or other appropriate
provision, if any, as shall be required in conformity with GAAP shall have been
made therefor; (ii) statutory Liens of landlords and carriers, warehousemen,
mechanics, suppliers, materialmen, repairmen or other similar Liens arising in
the ordinary course of business and with respect to amounts not yet delinquent
or being contested in good faith by appropriate legal proceedings, provided that
any reserve or other appropriate provision, if any, as shall be required in
conformity with GAAP shall have been made therefor; (iii) Liens incurred or
deposits made in the ordinary course of business in connection with workers'
compensation, unemployment insurance or other types of social security; (iv)
Liens incurred or deposits made to secure the performance of tenders, bids,
leases, statutory or regulatory obligations, bankers' acceptances, surety and
appeal bonds, government contracts, performance and return-of-money bonds and
other obligations of a similar nature incurred in the ordinary course of
business (exclusive of obligations for the payment of borrowed money); (v)
easements, rights-of-way, municipal and zoning ordinances and similar charges,
encumbrances, title defects or other irregularities that do not materially
interfere with the ordinary course of business of the Company or any of its
Subsidiaries, taken as a whole; (vi) Liens securing Purchase Money Obligations
permitted to be incurred by the provisions of the Indenture; (vii) leases or
subleases or licenses or sublicenses granted to others in the ordinary course of
business of the Company or any of its Restricted Subsidiaries, taken as a whole;
(viii) Liens encumbering property or assets under construction arising from
progress or partial payments by a customer of the Company or any of its
Restricted Subsidiaries relating to
 
                                       92
<PAGE>   94
 
such property or assets; (ix) any interest or title of a lessor in the property
subject to any Capital Lease Obligation; (x) Liens arising from filing Uniform
Commercial Code financing statements regarding leases; (xi) Liens on property
of, or on shares of stock or Indebtedness of, any corporation existing at the
time such corporation becomes, or becomes a part of, any Restricted Subsidiary;
(xii) Liens in favor of the Company or any Subsidiary; (xiii) Liens securing any
real property or other assets of the Company or any Restricted Subsidiary of the
Company in favor of the United States of America or any State, or any
department, agency, instrumentality or political subdivision thereof, in
connection with the financing of industrial revenue bond facilities or of any
equipment or other property designed primarily for the purpose of air or water
pollution control; provided that any such Lien on such facilities, equipment or
other property shall not apply to any other assets of the Company or such
Restricted Subsidiary of the Company; (xiv) Liens arising from the rendering of
a final judgment or order against the Company or any Restricted Subsidiary of
the Company that does not give rise to an Event of Default; (xv) Liens securing
reimbursement obligations with respect to letters of credit that encumber
documents and other property relating to such letters of credit and the products
and proceeds thereof; (xvi) Liens in favor of customs and revenue authorities
arising as a matter of law to secure payment of customs duties in connection
with the importation of goods; (xvii) Liens encumbering customary initial
deposits and margin deposits, and other Liens that are either within the general
parameters customary in the industry and incurred in the ordinary course of
business or otherwise permitted under the terms of the Company Credit Facility,
in each case securing Indebtedness under Commodity Agreements, Interest Rate
Agreements and Currency Agreements; and (xviii) Liens arising out of conditional
sale, title retention, consignment or similar arrangements for the sale of goods
entered into by the Company or any of its Restricted Subsidiaries in the
ordinary course of business in accordance with the past practices of the Company
and its Restricted Subsidiaries prior to the Closing Date.
 
     "Person" means any individual, corporation, partnership, joint venture,
incorporated or unincorporated association, joint-stock company, trust,
unincorporated organization or government or other agency or political
subdivision thereof or other entity of any kind.
 
     "Ply Gem Credit Facility" means one or more credit facilities between Ply
Gem or any of its Subsidiaries and one or more banks or other institutional
lenders, as the same may be amended, extended, amended and restated,
supplemented or otherwise modified or replaced from time to time, specifically
designated in each such credit facility as a "Ply Gem Credit Facility." All Ply
Gem Credit Facilities are referred to collectively in the Indenture as the "Ply
Gem Credit Facility."
 
     "Principal Property" means any manufacturing or processing plant, warehouse
or other building used by the Company or any Restricted Subsidiary, other than a
plant, warehouse or other building that, in the good faith opinion of the Board
of Directors as reflected in a Board Resolution, is not of material importance
as of the date such Board Resolution is adopted to the businesses conducted by
the Company and its Subsidiaries, on a consolidated basis, or conducted by any
Significant Subsidiary of the Company.
 
     "Purchase Money Obligations" means any Indebtedness of the Company or any
of its Restricted Subsidiaries incurred to finance the acquisition or
construction of any property or business (including Indebtedness incurred within
one year following such acquisition or construction), including Indebtedness of
a Person existing at the time such Person becomes a Restricted Subsidiary of the
Company or assumed by the Company or a Restricted Subsidiary of the Company in
connection with the acquisition of assets from such Person; provided, however,
that (i) any Lien on such Indebtedness shall not extend to any property other
than the property so acquired or constructed and (ii) at no time shall the
aggregate principal amount of outstanding Indebtedness secured thereby be
increased.
 
     "Redeemable Stock" means any Equity Interest which, by its terms (or by the
terms of any security into which it is convertible or for which it is
exchangeable before the Stated Maturity of the Notes), or upon the happening of
any event, matures or is mandatorily redeemable or is redeemable at the sole
option of the holder thereof, in whole or in part, prior to the Stated Maturity
of the Notes.
 
     "Restricted Subsidiary" means (i) any Subsidiary of the Company in
existence on the date of the Indenture, unless such Subsidiary shall have been
designated as an Unrestricted Subsidiary by resolution of the Board of Directors
of the Company as provided in and in compliance with the definition of
"Unrestricted
 
                                       93
<PAGE>   95
 
Subsidiary", (ii) any Subsidiary of the Company (other than a Subsidiary that is
also a Subsidiary of an Unrestricted Subsidiary) organized or acquired after the
date of the Indenture, unless such Subsidiary shall have been designated as an
Unrestricted Subsidiary by resolution of the Board of Directors of the Company
as provided in and in compliance with the definition of "Unrestricted
Subsidiary" and (iii) any Unrestricted Subsidiary which is designated as a
Restricted Subsidiary by the Board of Directors of the Company; provided that,
immediately after giving effect to the designation referred to in clause (iii),
no Default or Event of Default shall have occurred and be continuing and the
Company could incur at least $1.00 of additional Indebtedness under the first
paragraph under the Limitation on Additional Indebtedness covenant. The Company
shall evidence any such designation to the Trustee by promptly filing with the
Trustee an Officers' Certificate certifying that such designation has been made
and stating that such designation complies with the requirements of the
immediately preceding sentence.
 
     "Significant Subsidiary" means any Subsidiary that would be a "significant
subsidiary" as defined in Rule 1-02 of Regulation S-X promulgated by the
Commission, as such regulation is in effect on the date of the Indenture.
 
     "Stated Maturity" means, with respect to any security or Indebtedness, the
date specified therein as the fixed date on which the principal of such security
or Indebtedness is due and payable, including pursuant to any mandatory
redemption provision (but excluding any provision providing for the repurchase
of such security or Indebtedness at the option of the holder thereof upon the
happening of any contingency).
 
     "Subsidiary" of any Person means any corporation, partnership, association
or other business entity of which more than 50% of the total voting power of
shares of Capital Stock entitled (without regard to the occurrence of any
contingency) to vote in the election of directors or, in the case of a Person
which is not a corporation, the members of the appropriate governing board or
other group is at the time owned or controlled, directly or indirectly, by such
Person or one or more of the other Subsidiaries of such Person or a combination
thereof.
 
     "Subsidiary Guarantor" means, with respect to any Subsidiary Guaranty, the
issuer of such Subsidiary Guaranty, so long as such Subsidiary Guaranty remains
outstanding.
 
     "Subsidiary Guaranty" means any guaranty of the Notes pursuant to a
supplemental indenture executed and delivered pursuant to the Limitation on
Guaranties by Subsidiaries covenant, including as the context may require either
or both of the guaranty of the Notes set forth as an exhibit to the Indenture
upon the execution and delivery by a Subsidiary Guarantor of such supplemental
indenture and any separate guaranty of the Notes or confirmation of guaranty
executed and delivered by such Subsidiary Guarantor pursuant to such
supplemental indenture.
 
     "Trustee" means the party named as the "Trustee" in the first paragraph of
the Indenture until a successor replaces it pursuant to the applicable
provisions of the Indenture and, thereafter, shall mean such successor.
 
     "Unrestricted Subsidiary" means, until such time as any of the following
shall be designated as a Restricted Subsidiary of the Company by the Board of
Directors of the Company as provided in and in compliance with the definition of
"Restricted Subsidiary," (i) any Subsidiary of the Company or of a Restricted
Subsidiary organized or acquired after the date of the Indenture that is
designated concurrently with its organization or acquisition as an Unrestricted
Subsidiary by resolution of the Board of Directors of the Company, (ii) any
Subsidiary of any Unrestricted Subsidiary, and (iii) any Restricted Subsidiary
of the Company that is designated as an Unrestricted Subsidiary by resolution of
the Board of Directors of the Company, provided that, (a) immediately after
giving effect to such designation, no Default or Event of Default shall have
occurred and be continuing, (b) any such designation shall be deemed the making
of a Restricted Payment at the time of such designation in an amount equal to
the Fair Market Value of the Investment in such Subsidiary and shall be subject
to the restrictions contained in the "Limitation on Restricted Payments"
covenant, and (c) such Subsidiary or any of its Subsidiaries does not own any
Capital Stock or Indebtedness of, or own or hold any Lien on any property of,
the Company or any other Restricted Subsidiary of the Company that is not a
Subsidiary of the Subsidiary to be so designated. A Person may be
 
                                       94
<PAGE>   96
 
designated as an Unrestricted Subsidiary only if and for so long as such Person
(i) has no Indebtedness other than Non-Recourse Debt; (ii) is a Person with
respect to which neither the Company nor any of its Restricted Subsidiaries has
any direct or indirect obligation (a) to subscribe for additional Equity
Interests or (b) to make any payment to maintain or preserve such Person's
financial condition or to cause such Person to achieve any specified levels of
operating results, except to the extent any such direct or indirect obligation
would then be permitted in accordance with the Limitation on Restricted Payments
covenant; and (iii) has not guaranteed or otherwise directly or indirectly
provided credit support for any Indebtedness of the Company or any of its
Restricted Subsidiaries. The Company shall evidence any designation pursuant to
clause (i) or (iii) of the first sentence hereof to the Trustee by filing with
the Trustee within 45 days of such designation an Officers' Certificate
certifying that such designation has been made and that such designation
complies with the requirements of the Indenture and all conditions thereto have
been satisfied.
 
     "Wholly-Owned Subsidiary" of any Person means any Subsidiary of such Person
to the extent the entire voting share capital of such Subsidiary (other than
directors' qualifying shares) is owned by such Person (either directly or
indirectly through Wholly-Owned Subsidiaries).
 
BOOK-ENTRY, DELIVERY AND FORM
 
     Except as set forth in the next paragraph, the Exchange Notes will
initially be issued in the form of one or more Global Notes (the "Global
Notes"). The Global Notes will be deposited on the Closing Date with, or on
behalf of, the Depositary and registered in the name of Cede & Co., as nominee
of the Depositary or will remain in the custody of the Trustee pursuant to the
FAST Balance Certificate Agreement between the Depositary and the Trustee (such
nominee or the Trustee, in such capacity being referred to herein as the "Global
Note Holder").
 
     Exchange Notes that are issued as described below under "-- Certificated
Securities" will be issued in registered form (the "Certificated Securities").
Upon the transfer of Certificated Securities, such Certificated Securities may,
unless the Global Notes have previously been exchanged for Certificated
Securities, be exchanged for an interest in a Global Note representing the
principal amount of Notes being transferred.
 
     The Depositary is a limited-purpose trust company which was created to hold
securities for its participating organizations (collectively, the "Participants"
or the "Depositary's Participants") and to facilitate the clearance and
settlement of transactions in such securities between Participants through
electronic book-entry changes in accounts of its Participants, thereby
eliminating the need for physical transfer and delivery of certificates. The
Depositary's Participants include securities brokers and dealers (including the
Initial Purchasers), banks and trust companies, clearing corporations and
certain other organizations. Access to the Depositary's system is also available
to other entities such as banks, brokers, dealers and trust companies
(collectively, the "Indirect Participants" or the "Depositary's Indirect
Participants") that clear through or maintain a custodial relationship with a
Participant, either directly or indirectly. Persons who are not Participants may
beneficially own securities held by or on behalf of the Depositary only through
the Depositary's Participants or the Depositary's Indirect Participants.
 
     The Company expects that pursuant to procedures established by the
Depositary (i) upon deposit of the Global Notes with the Global Note Holder, the
Depositary will credit the accounts of Participants designated by the Initial
Purchasers with portions of the principal amount of the Global Notes and (ii)
ownership of the Notes evidenced by the Global Notes will be shown on, and the
transfer of ownership thereof will be effected only through, records maintained
by the Depositary (with respect to the interests of the Depositary's
Participants), the Depositary's Participants and the Depositary's Indirect
Participants. Prospective purchasers are advised that the laws of some states
require that certain Persons take physical delivery in definitive form of
securities that they own. Consequently, the ability to transfer Notes evidenced
by the Global Notes will be limited to such extent. For certain other
restrictions on the transferability of the Notes, see "Notice to Investors."
 
     Accordingly, each holder owning a beneficial interest in a Global Note must
rely on the procedures of the Depositary and, if such holder is not a
Participant or an Indirect Participant, on the procedures of the Participant
through which such holder owns its interest, to exercise any rights of a holder
of Notes under the
 
                                       95
<PAGE>   97
 
Indenture or such Global Note. The Company understands that under existing
industry practice, in the event the Company requests any action of holders of
Notes or a holder that is an owner of a beneficial interest in a Global Note
desires to take any action that the Global Note Holder as the holder of such
Global Note, is entitled to take, the Depositary would authorize the
Participants to take such action and the Participant would authorize holders
owning through such Participants to take such action or would otherwise act upon
the instruction of such holders. Neither the Company nor the Trustee will have
any responsibility or liability for any aspect of the records relating to or
payments made on account of Notes by the Depositary, or for maintaining,
supervising or reviewing any records of the Depositary or relating to such
Notes.
 
     So long as the Global Note Holder is the registered owner of any Exchange
Notes, the Global Note Holder will be considered the sole owner or holder of
such Notes outstanding under the Indenture. Beneficial owners of Notes evidenced
by the Global Note will not be entitled to receive physical delivery of
Certified Securities, and will not be considered the owners or Holders thereof
under the Indenture for any purpose, including with respect to the giving of any
directions, instructions or approvals to the Trustee thereunder. The laws of
some states require that certain persons take physical delivery in definitive
form of securities that they own and that security interests in negotiable
instruments can only be perfected by delivery of certificates representing the
instruments. Consequently, the ability to transfer Notes or to pledge the Notes
as collateral will be limited to such extent.
 
     Neither the Company nor the Trustee will have any responsibility or
liability for any aspect of the records relating to or payments made on account
of Notes by the Depositary, or for maintaining, supervising or reviewing any
records of the Depositary relating to such Notes.
 
     Payments in respect of the principal of, premium, if any, and Liquidated
Damages, if any, with respect to, any Notes registered in the name of a Global
Note Holder on the applicable record date will be payable by the Trustee to or
at the direction of such Global Note Holder in its capacity as the registered
holder under the Indenture. Under the terms of the Indenture, the Company and
the Trustee may treat the Persons in whose names the Notes, including the Global
Notes, are registered as the owners thereof for the purpose of receiving such
payments and for any and all other purposes whatsoever. Consequently, neither
the Company nor the Trustee has or will have any responsibility or liability for
the payment of such amounts to beneficial owners of Notes (including principal,
premium, if any, interest and Liquidated Damages, if any).
 
     The Company believes, however, that it is currently the policy of the
Depositary to immediately credit the accounts of the relevant Participants with
such payment, in amounts proportionate to their respective holdings in principal
amount of beneficial interests in the relevant security as shown on the records
of the Depositary. Payments by the Depositary's Participants and the
Depositary's Indirect Participants to the beneficial owners of Notes will be
governed by standing instructions and customary practice and will be the
responsibility of the Depositary's Participants or the Depositary's Indirect
Participants.
 
CERTIFICATED SECURITIES
 
     Subject to certain conditions, any Person having a beneficial interest in a
Global Note may, upon request to the Company or the Trustee, exchange such
beneficial interest for Notes in the form of Certificated Securities. Upon any
such issuance, the Trustee is required to register such Notes in the name of,
and cause the same to be delivered to, such Person or Persons. All such
Certificated Securities would be subject to the legend requirements described
herein under "Notice to Investors." In addition, if (i) the Company notifies the
Trustee in writing that the Depositary is no longer willing or able to act as a
depositary and the Company is unable to appoint a qualified successor within 90
days or (ii) the Company, at its option, notifies the Trustee in writing that it
elects to cause the issuance of Notes in the form of Certificated Securities
under the Indenture, then, upon surrender by the relevant Global Note Holder of
its Global Note, Notes in such form will be issued to each Person that the
Depositary identifies as the beneficial owner of the related Notes.
 
     Neither the Company nor the Trustee shall be liable for any delay by the
Depositary in identifying the beneficial owners of the related Notes and each
such Person may conclusively rely on, and shall be protected in relying on,
instructions from the Depositary for all purposes (including with respect to the
registration and delivery, and the respective principal amounts, of the Notes to
be issued).
 
                                       96
<PAGE>   98
 
SAME-DAY SETTLEMENT AND PAYMENT
 
     The Indenture will require that payments in respect of the Exchange Notes
(including principal, premium, if any, interest and Liquidated Damages, if any)
be made by wire transfer of immediately available funds to the accounts
specified by the Global Note Holder. Secondary trading in long-term notes and
debentures of corporate issuers is generally settled in clearing-house or
next-day funds. In contrast, the Notes have been designated as eligible for
trading in the PORTAL market and are expected to trade in the Depositary's
Next-Day Funds Settlement System, and any permitted secondary market trading
activity in the Notes will therefore be required by the Depositary to be settled
in immediately available funds. The Company expects that secondary trading in
the Certificated Notes also will be settled in immediately available funds.
 
                                       97
<PAGE>   99
 
                               THE EXCHANGE OFFER
 
REGISTRATION RIGHTS; LIQUIDATED DAMAGES
 
     The Company and the Initial Purchasers entered into the Registration Rights
Agreement on July 31, 1998 (the "Closing Date"). Pursuant to the Registration
Rights Agreement, the Company agreed to use its best efforts to cause to be
filed with the Commission the Exchange Offer Registration Statement, of which
this Prospectus forms a part, on the appropriate form under the Securities Act
with respect to an offer to exchange the Original Notes for Exchange Notes. In
the event that (i) the Company is not permitted to commence or accept tenders
pursuant to the Exchange Offer because the Exchange Offer is not permitted by
applicable law or Commission policy, (ii) any Holder of Transfer Restricted
Securities notifies the Company within 20 business days after the consummation
of the Exchange Offer that (a) it is prohibited by law or Commission policy from
participating in the Exchange Offer or (b) that it may not resell the Exchange
Notes acquired by it in the Exchange Offer to the public without delivering a
prospectus and the prospectus contained in the Exchange Offer Registration
Statement is not appropriate or available for such resales or (c) that it is a
broker-dealer and owns Notes acquired directly from the Company or an Affiliate
of the Company, or (iii) the Exchange Offer is not for any other reason
consummated within 210 days of the Closing Date, the Company will file with the
Commission a shelf registration statement to cover resales of the Notes by the
Holders thereof who satisfy certain conditions relating to the provision of
information in connection with such registration statement (the "Shelf
Registration Statement"). The Company will use its best efforts to cause the
applicable registration statement to be declared effective as promptly as
possible by the Commission. The Company will keep the Exchange Offer open for
not less than 30 days (or longer, if required by applicable law) after the date
notice of the Exchange Offer is mailed to the holders of the Notes. For purposes
of the foregoing, "Transfer Restricted Securities" means each Note until (i) the
date on which such Note has been exchanged by a Person other than a
broker-dealer for an Exchange Note in the Exchange Offer, (ii) following the
exchange by a broker-dealer in the Exchange Offer of a Note for an Exchange
Note, the date on which such Exchange Note is sold to a purchaser who receives
from such broker-dealer on or prior to the date of such sale a copy of the
prospectus contained in the Exchange Offer Registration Statement, (iii) the
date on which such Note has been effectively registered under the Securities Act
and disposed of in accordance with the Shelf Registration Statement or (iv) the
date on which such Note is distributed to the public pursuant to Rule 144 under
the Securities Act.
 
     This Prospectus covers the offer and sale of the Exchange Notes pursuant to
the Exchange Offer made hereby and the resale of the Exchange Notes received in
the Exchange Offer by any Participating Broker-Dealer who holds Original Notes
(other than Original Notes acquired directly from the Company or one of its
affiliates).
 
     Under existing interpretations by the staff of the Commission, the Exchange
Notes would, in general, be freely transferable after the Exchange Offer without
further registration under the Securities Act; provided, that broker-dealers
receiving Exchange Notes in the Exchange Offer will have a prospectus delivery
requirement with respect to the resales of Exchange Notes. The Commission has
taken the position that such broker-dealers may fulfill their prospectus
delivery requirements with respect to the Exchange Notes (other than a resale of
an unsold allotment from the original sale of Notes) with the prospectus
contained in the Exchange Offer Registration Statement. The Company has agreed,
for a period of 180 days after consummation of the Exchange Offer, to make
available a prospectus meeting the requirements of the Securities Act to any
broker-dealer for use in connection with any resale of any Exchange Notes
acquired.
 
     All resales must be made in compliance with applicable state securities or
blue sky laws. Such compliance may require that resales be made by or through a
licensed broker-dealer. The Company assumes no responsibility with regard to
compliance with such requirements.
 
     Each Holder (other than certain specified holders) who wishes to exchange
such Notes for Exchange Notes in the Exchange Offer will be required to make
certain representations, including representations that (i) any Exchange Notes
to be received by it will be acquired in the ordinary course of its business,
(ii) at the time of the commencement of the Exchange Offer, it had no
arrangement with any Person to participate in the
 
                                       98
<PAGE>   100
 
distribution (within the meaning of the Securities Act) of the Exchange Notes
and (iii) is not an "affiliate," as defined in Rule 405 of the Securities Act,
of the Company.
 
     The Registration Rights Agreement provides that, to the extent not
prohibited by any applicable law or applicable interpretation of the staff of
the Commission, (i) the Company will use its best efforts to cause to be filed
with the Commission an Exchange Offer Registration Statement on or prior to 90
days after the Closing Date, (ii) the Company will use its best efforts to have
such Exchange Offer Registration Statement declared effective under the
Securities Act by the Commission on or prior to 165 days after the Closing Date,
(iii) the Company will use its best efforts to cause the Exchange Offer to be
consummated on or prior to 45 days after the date on which the Exchange Offer
Registration Statement was declared effective under the Securities Act by the
Commission and (iv) if obligated to cause to be filed with the Commission the
Shelf Registration Statement, the Company will cause to be filed with the
Commission a Shelf Registration Statement on or prior to 45 days after such
filing obligation arises and use its best efforts to cause the Shelf
Registration Statement to be declared effective by the Commission on or prior to
90 days after such obligation arises. The Company shall use its reasonable best
efforts to keep such Shelf Registration Statement continuously effective,
supplemented and amended until the second anniversary of the Closing Date or
such shorter period that will terminate when all the securities covered by the
Shelf Registration Statement have been sold pursuant to the Shelf Registration
Statement. If (a) the Company fails to file any Registration Statement required
by the Registration Rights Agreement on or prior to the date specified for such
filing, (b) any such Registration Statement is not declared effective by the
Commission on or prior to the date specified for such effectiveness (the
"Effectiveness Target Date"), (c) the Company fails to consummate the Exchange
Offer on or prior to 45 days after the Effectiveness Target Date with respect to
the Exchange Offer Registration Statement, or (d) the Shelf Registration
Statement or the Exchange Offer Registration Statement is declared effective but
thereafter ceases to be effective or usable during the periods specified in the
Registration Rights Agreement (each such event referred to in clauses (a)
through (d) above a "Registration Default"), then the Company will be required
to pay Liquidated Damages in an amount equal to $.05 per week per $1,000
principal amount held by such Holder to each Holder affected by such
Registration Default on each interest payment date. For any portion of a week
that the Registration Default continues such Liquidated Damages shall be
calculated on a pro-rata basis. The amount of Liquidated Damages will increase
by an additional $.05 per week per $1,000 principal amount of Notes with respect
to each subsequent 90-day period until all Registration Defaults have been
cured, up to a maximum amount of Liquidated Damages of $.25 per week per $1,000
principal amount of Notes.
 
     Except as set forth above, after consummation of the Exchange Offer,
Holders of Original Notes have no registration or exchange rights under the
Registration Rights Agreement. See "-- Consequences of Failure to Exchange," and
"-- Resales of Exchange Notes; Plan of Distribution."
 
CONSEQUENCES OF FAILURE TO EXCHANGE
 
     The Original Notes which are not exchanged for Exchange Notes pursuant to
an Exchange Offer and are not included in a resale prospectus will remain
restricted securities. Accordingly, such Original Notes may be offered, sold or
otherwise transferred prior to the date which is two years after the later of
the date of original issue and the last date that the Company or any affiliate
of the Company was the owner of such securities (or any predecessor thereto)
(the "Resale Restricted Termination Date") only (a) to the Company (b) pursuant
to a registration statement which has been declared effective under the
Securities Act, (c) for so long as the Original Notes are eligible for resale
pursuant to rule 144A, to a person the owner reasonably believes is a qualified
institutional buyer that purchases for its own account or for the account of a
qualified institutional buyer to whom notice is given that the transfer is being
made in reliance on Rule 144A, (d) to an "accredited investor" within the
meaning of subparagraph (1), (2), (3) or (7) of paragraph (a) of Rule 501 under
the Securities Act that is purchasing for his own account or for the account of
such an "accredited investor" in each case in a minimum of Original Notes with a
purchase price of $100,000 or (e) pursuant to any other available exemption from
the registration requirements of the Securities Act, subject in each of the
foregoing cases to any requirement of law that the disposition of its property
or the property of such investor account or accounts be at all times within its
or their control. The foregoing restrictions on resale will not apply
 
                                       99
<PAGE>   101
 
subsequent to the Resale Restriction Termination Date. If any resale or other
transfer of the Original Notes is proposed to be made pursuant to clause (d)
above prior to the Resale Restriction Termination Date, the transferor shall
deliver a letter from the transferee to the Company and the Trustee, which shall
provide, among other things, that the transferee is an "accredited investor"
within the meaning of subparagraph (1), (2), (3) or (7) of paragraph (a) of Rule
501 under the Securities Act and that it is acquiring such Securities for
investment purposes and not for distribution in violation of the Securities Act.
Prior to any offer, sale or other transfer of Original Notes prior to the Resale
Restriction Termination Date pursuant to clauses (d) or (e) above, the issuer
and the Trustee may require the delivery of an opinion of counsel,
certifications and/or other information satisfactory to each of them.
 
TERMS OF THE EXCHANGE OFFER
 
     Upon the terms and subject to the conditions set forth in this Prospectus
and in the accompanying Letter of Transmittal, the Company will accept all
Original Notes properly tendered and not withdrawn prior to the applicable
Expiration Date. The Company will issue $1,000 principal amount of Exchange
Notes in exchange for each $1,000 principal amount of outstanding Original Notes
accepted in the Exchange Offer. Holders may tender some or all of their Original
Notes pursuant to the Exchange Offer. However, Original Notes may be tendered
only in integral multiples of $1,000 principal amount at final maturity.
 
     The form and terms of the Exchange Notes are the same as the form and terms
of the Original Notes, except that (i) the Exchange Notes bear a Series B
designation, (ii) the Exchange Notes have been registered under the Securities
Act and therefore will generally not bear legends restricting their transfer
(except as may be required under state securities laws) pursuant to the
Securities Act, and (iii) the Exchange Notes will not provide for the payment of
Liquidated Damages (except in certain limited circumstances set forth in the
Registration Rights Agreement). The Exchange Notes will evidence the same debt
as the Original Notes (which they replace), and will be issued under, and be
entitled to the benefits of, the Indenture.
 
   
     Solely for reasons of administration (and for no other purpose) the Company
has fixed the close of business on             , 1999 as the record date for the
Exchange Offer for the purpose of determining the persons to whom this
Prospectus and the Letter of Transmittal will be mailed initially. Only a
registered Holder of Original Notes (or such Holder's legal representative or
attorney-in-fact) as reflected on the records of the trustee under the governing
indenture may participate in the Exchange Offer. There will be no fixed record
date for determining registered Holders of the Original Notes entitled to
participate in the relevant Exchange Offer.
    
 
     Holders of the Original Notes do not have any appraisal or dissenters'
rights under the General Corporation Law of Delaware or under the Indenture in
connection with the Exchange Offer. The Company intends to conduct the Exchange
Offer in accordance with the applicable requirements of the Exchange Act and the
rules and regulations of the Commission thereunder.
 
     The Company shall be deemed to have accepted validly tendered Original
Notes when, and if the Company has given oral or written notice thereof to the
Exchange Agent. The Exchange Agent will act as agent for the tendering Holders
of Original Notes for the purpose of receiving Exchange Notes.
 
     If any tendered Original Notes are not accepted for exchange because of an
invalid tender, the occurrence of certain other events set forth herein or
otherwise, certificates for any such unaccepted Original Notes will be returned,
without expenses, to the tendering Holder, thereof, as promptly as practicable
after the Expiration Date.
 
     Holders of Original Notes who tender in the Exchange offer will not be
required to pay brokerage commissions or fees or, subject to the instructions in
the Letter of Transmittal, transfer taxes with respect to the exchange of
Original Notes pursuant to the Exchange Offer. The Company will pay all charges
and expenses, other than certain applicable taxes, in connection with the
Exchange Offer. See "-- Fees and Expenses."
 
                                       100
<PAGE>   102
 
EXPIRATION DATES; EXTENSIONS; AMENDMENTS
 
   
     The term "Expiration Date" shall mean 5:00 p.m. New York City time on
[          ], 1999 unless the Company, in its sole discretion, extends the
Exchange Offer, in which case the term "Expiration Date" shall mean the latest
date to which the Exchange Offer is extended.
    
 
     In order to extend the Expiration Date, the Company will notify the
Exchange Agent of any extension by oral or written notice and will make a public
announcement thereof, prior to 9:00 a.m., New York City time, on the next
business day after the previously scheduled Expiration Date.
 
     The Company reserves the right in its sole discretion (i) to delay
acceptance of any Original Notes, (ii) to extend the Exchange Offer, (iii) if
the condition set forth below under "-- Conditions of the Exchange Offer" shall
not have been satisfied, to terminate the Exchange Offer by giving oral or
written notice of such delay, extension or termination to the Exchange Agent, or
(iv) to amend the terms of the Exchange Offer in any manner. Any such delay in
acceptance, extension, termination or amendment will be followed as promptly as
practicable by a public announcement thereof. If the Exchange Offer is amended
in a manner determined by the Company to constitute a material change, the
Company will promptly disclose such amendment by means of a prospectus
supplement that will be distributed to the registered holders of the Original
Notes and the Exchange Offer will be extended for a period of five to ten
business days, as required by law, depending upon the significance of the
amendment and the manner of disclosure to the registered holders, if the
Exchange Offer would otherwise expire during such five to ten business day
period.
 
     Without limiting the manner in which the Company may choose to make public
announcements of any delay in acceptance, extension, termination or amendment of
the Exchange Offer, the Company shall have no obligation to publish, advertise,
or otherwise communicate any such public announcement, other than by making a
timely release to the Dow Jones News Service.
 
PROCEDURES FOR TENDERING
 
     Only a registered Holder of Original Notes may tender such Original Notes
in the Exchange Offer. To tender in the Exchange Offer, a Holder must complete,
sign and date the Letter of Transmittal, have the signatures thereon guaranteed
if required by the Letter of Transmittal, and mail or otherwise deliver such
Letter of Transmittal, or (in the case of a book-entry transfer) transmit an
Agent's Message in lieu of the Letter of Transmittal, to the Exchange Agent at
the address set forth below prior to 5:00 p.m., New York City time, on the
Expiration Date. In addition, either (i) certificates for such Original Notes
must be received by the Exchange Agent along with the letter of Transmittal, or
(ii) a timely confirmation of a book-entry transfer (a "Book-Entry
Confirmation") of such Original Notes, if such procedure is available, into the
Exchange Agent's account at The Depository Trust Company (the "Book-Entry
Transfer Facility") pursuant to the procedure for book-entry transfer described
below, including an Agent's Message, must be received by the Exchange Agent
prior to the applicable Expiration Date, or (iii) the Holder must comply with
the guaranteed delivery procedures described below. To be tendered effectively,
the Letter of Transmittal, or Agent's Message in lieu thereof, and all other
required documents must be received by the Exchange Agent at the address set
forth below under "-- Exchange Agent" prior to the applicable Expiration Date.
 
     The term "Agent's Message" means a message transmitted by DTC to and
received by the Exchange Agent and forming part of the book-entry confirmation,
which states that DTC has received an express acknowledgment from the tendering
Holder, which acknowledgment states that such Holder has received and agrees to
be bound by the Letter of Transmittal and that the Company may enforce the
Letter of Transmittal against such Holder. The term "book-entry confirmation"
means a timely confirmation of book-entry transfer of Original Notes to the
Exchange Agent's account at DTC.
 
     The tender by a Holder of Original Notes will constitute an agreement
between such holder and the Company in accordance with the terms and subject to
the conditions set forth herein and in the Letter of Transmittal.
 
     THE METHOD OF DELIVERY OF THE ORIGINAL NOTES AND THE APPLICABLE LETTER OF
TRANSMITTAL AND ALL OTHER REQUIRED DOCUMENTS TO THE
 
                                       101
<PAGE>   103
 
EXCHANGE AGENT IS AT THE ELECTION AND RISK OF THE HOLDER. INSTEAD OF DELIVERY BY
MAIL, IT IS RECOMMENDED THAT HOLDERS USE AN OVERNIGHT OR HAND DELIVERY SERVICE.
IN ALL CASES, SUFFICIENT TIME SHOULD BE ALLOWED TO ASSURE DELIVERY TO THE
EXCHANGE AGENT BEFORE THE APPLICABLE EXPIRATION DATE. NO LETTER OF TRANSMITTAL
OR ORIGINAL NOTES SHOULD BE SENT TO THE COMPANY. HOLDERS MAY REQUEST THEIR
RESPECTIVE BROKERS, DEALERS, COMMERCIAL BANKS, TRUST COMPANIES OR NOMINEES TO
EFFECT THE ABOVE TRANSACTIONS FOR SUCH HOLDERS.
 
     Any beneficial owner whose Original Notes are registered in the name of a
broker, dealer, commercial bank, trust company or other nominee and who wishes
to tender should consider such registered holder promptly and instruct such
registered Holder to tender on his behalf. If such beneficial owner wishes to
tender on his own behalf, such beneficial owner must, prior to completing and
executing the Letter of Transmittal and delivering his Original Notes, either
make appropriate arrangements to register ownership of the Original Notes in
such owner's name or obtain a properly completed bond power from the registered
holder. The transfer of record ownership may take considerable time.
 
     Signatures on a Letter of Transmittal or a notice of withdrawal, as the
case may be, must be guaranteed by a an Eligible Institution (as defined) unless
the Original Notes tendered pursuant thereto are tendered (i) by a registered
owner who has not completed the box entitled "Special Issuance Instructions" or
"Special Delivery Instructions" on the Letter of Transmittal or (ii) for the
account of an Eligible Institution. In the event that signatures on a Letter of
Transmittal or a notice of withdrawal, as the case may be, are required to be
guaranteed, such guarantee must be by a participant in a recognized signature
guarantee medallion program within the meaning of Rule 17Ad-15 under the
Exchange Act (an "Eligible Institution").
 
     If a Letter of Transmittal is signed by a person other than a registered
owner of any Original Notes listed therein, such Original Notes must be endorsed
or accompanied by properly completed bond powers, signed by such registered
owner as such registered owner's name appears on the Original Notes, with
signature guaranteed by an Eligible Institution.
 
     If the Letter of Transmittal or any Original Notes or bond power are signed
by trustees, executors, administrators, guardians, attorneys-in-fact, officers
of corporations or others acting in fiduciary or representative capacity, such
persons should so indicate when signing, and evidence satisfactory to the
Company, as applicable, of their authority to so act must be submitted with the
Letter of Transmittal designated for such Original Notes.
 
     All questions as to the validity, form, eligibility (including time of
receipt), acceptance and withdrawal of the tendered Original Notes will be
determined by the Company in its sole discretion, which determination will be
final and binding. The Company reserves the absolute right to reject any and all
Original Notes not properly tendered or any Original Notes the Company's
acceptance of which would, in the opinion of counsel for the Company, be
unlawful. The Company also reserves the absolute right to waive any defects,
irregularities or conditions of tender as to particular Original Notes. The
Company's interpretation of the terms and conditions of the Exchange Offer
(including the instructions in the Letter of Transmittal) will be final and
binding on all parties. Unless waived, any defects or irregularities in
connection with tenders of Original Notes must be cured within such time as the
Company shall determine. Neither the Company, the Exchange Agent nor any other
person shall be under any duty to give notification of defects or irregularities
with respect to tenders of Original Notes nor shall any of them incur any
liability for failure to give such notification. Tenders of Original Notes will
not be deemed to have been made until such irregularities have been cured or
waived. Any Original Notes received by the Exchange Agent that are not properly
tendered and as to which the defects or irregularities have not been cured or
waived will be returned without cost by the Exchange Agent to the tendering
holder of such Original Notes (or, in the case of Original Notes tendered by
book-entry transfer into the Exchange Agent's account at the Book-Entry Transfer
Facility pursuant to the book-entry transfer procedures described below, such
unaccepted or non-exchanged Original Notes will be credited to an account
maintained with such Book-Entry Transfer Facility), unless otherwise provided in
the Letter of Transmittal, as soon as practicable following the Expiration Date.
 
                                       102
<PAGE>   104
 
     By tendering Original Notes in the Exchange Offer, each registered Holder
will represent to the issuer of such Original Notes that, among other things,
(i) the Exchange Notes to be acquired by the Holder and any beneficial owner(s)
of such Original Notes ("Beneficial Owner(s)") in connection with the Exchange
Offer are being acquired by the Holder and any Beneficial Owner(s) in the
ordinary course of business of the Holder and any Beneficial Owner(s), (ii) the
Holder and each Beneficial Owner are not participating, do not intend to
participate, and have no arrangements or understanding with any person to
participate, in a distribution of the Exchange Notes, (iii) the Holder and each
Beneficial Owner acknowledge and agree that (x) any person participating in an
Exchange Offer for the purpose of distributing the Exchange Notes must comply
with the transaction with respect to the Exchange Notes acquired by such person
and cannot rely on the position of the Staff of the Commission set forth in
no-action letters that are discussed herein under "-- Resales of the Exchange
Notes", and (y) any Participating Broker-Dealer that receives Exchange Notes for
its own account in exchange for Original Notes pursuant to an Exchange Offer
must deliver a prospectus in connection with any resale of such Exchange Notes,
but by so acknowledging, the holder shall not be deemed to admit that, by
delivering a prospectus, it is an "underwriter" within the meaning of the
Securities Act, (iv) neither the holder nor any Beneficial Owner is an
"affiliate," as defined under Rule 405 of the Securities Act, of the Company
except as otherwise disclosed to the Company in writing, and (v) the Holder and
each Beneficial Owner understands that a secondary resale transaction described
in clause (iii) above should be covered by an effective registration statement
containing the selling securityholder information required by Item 507 of
Regulation S-K of the Commission.
 
BOOK-ENTRY TRANSFER
 
     The Exchange Agent will make a request to establish an account with respect
to the Original Notes at the Book-Entry Transfer Facility, for purposes of the
Exchange Offer, within two business days after the date of this Prospectus, and
any financial institution that is a participant in the Book-Entry Transfer
Facility's system may make book-entry delivery of Original Notes by causing the
Book-Entry Transfer Facility to transfer such Original Notes into the Exchange
Agent's account at the Book-Entry Transfer Facility in accordance with such
Book-Entry Transfer Facility's procedures for transfer. However, although
delivery of Original Notes may be effected through book-entry transfer at the
Book-Entry Transfer Facility, the applicable Letter of Transmittal, with any
required signature guarantees and any other documents, or an Agent's Message in
lieu of the Letter of Transmittal must be transmitted to and received by the
Exchange Agent at the address set forth below under "-- Exchange Agent" on or
prior to the applicable Expiration Date or the guaranteed delivery procedures
described below must be complied with.
 
GUARANTEED DELIVERY PROCEDURES
 
     Holders who wish to tender their Original Notes and (i) whose Original
Notes are not immediately available, or (ii) who cannot deliver their Original
Notes, the Letter of Transmittal or any other required documents to the Exchange
Agent prior to the applicable Expiration Date, may effect a tender if:
 
          (a) The tender is made through an Eligible Institution;
 
          (b) Prior to the applicable Expiration Date, the Exchange Agent
     receives from such Eligible Institution a properly completed and duly
     executed Notice of Guaranteed Delivery (by facsimile transmission, mail or
     hand delivery) setting forth the name and address of the Holder of the
     Original Notes, the certificate number or numbers of such Original Notes
     and the principal amount of Original Notes tendered, stating that the
     tender is being made thereby, and guaranteeing that, within five business
     days after the applicable Expiration Date, the applicable Letter of
     Transmittal (or facsimile thereof), of Agent's Message in lieu thereof,
     together with the certificate(s) representing the Original Notes to be
     tendered in proper form for transfer (or confirmation of a book-entry
     transfer into the Exchange Agent's account at DTC of the Original Notes
     delivered electronically) and any other documents required by the
     applicable Letter of Transmittal, will be deposited by the Eligible
     Institution with the Exchange Agent; and
 
                                       103
<PAGE>   105
 
          (c) Such properly completed and executed Letter of Transmittal (or
     facsimile thereof), or Agent's Message in lieu thereof, together with the
     certificate(s) representing all tendered Original Notes in proper form for
     transfer (or confirmation of a book-entry transfer into the Exchange
     Agent's account at DTC of Original Notes delivered electronically) and all
     other documents required by the Letter of Transmittal are received by the
     Exchange Agent within five business days after the applicable Expiration
     Date.
 
WITHDRAWAL OF TENDERS
 
     Except as otherwise provided herein, tenders of Original Notes pursuant to
an Exchange Offer, unless theretofore accepted for exchange as provided in the
Exchange Offer, may be withdrawn at any time prior to 5:00 p.m., New York City
time, on the business day prior to the Expiration Date.
 
     To be effective, a written or facsimile transmission notice of withdrawal
must be received by the Exchange Agent at its address set forth herein by 5:00
p.m., New York City time, on the business day prior to the Expiration Date. Any
such notice of withdrawal must (i) specify the name of the person having
deposited the Original Notes to be withdrawn (the "Depositor"), (ii) identify
the Original Notes to be withdrawn (including the certificate number or numbers
and aggregate principal amount of such Original Notes), and (iii) to be signed
by the holder in the same manner as the original signature on the applicable
Letter of Transmittal (including any required signature guarantees). All
questions as to the validity, form and eligibility (including time of receipt)
for such withdrawal notices will be determined by the Company, whose
determination shall be final and binding on all parties.
 
     Any Original Notes so withdrawn will be deemed not to have been validly
tendered for purposes of the Exchange Offer and no Exchange Notes will be issued
with respect thereto unless the Original Notes so withdrawn are validly
retendered. Properly withdrawn Original Notes may be retendered by following one
of the procedures described above under "-- Procedures for Tendering" at any
time prior to the applicable Expiration Date.
 
     Any Original Notes which have been tendered but which are not accepted for
exchange due to the rejection of the tender due to uncured defects or the prior
termination of the applicable Exchange Offer, or which have been validly
withdrawn, will be returned to the holder thereof (unless otherwise provided in
the Letter of Transmittal), as soon as practicable following the applicable
Expiration Date or, if so requested in the notice of withdrawal, promptly after
receipt by the issuer of the Original Notes of notice of withdrawal without cost
to such holder.
 
CONDITIONS OF THE EXCHANGE OFFER
 
     The Exchange Offer is subject to the condition that the Exchange Offer, or
the making of any exchange by a Holder, does not violate applicable law or any
applicable interpretation of the staff of the Commission. If there has been a
change in commission policy such that in the reasonable opinion of Counsel to
the Company there is a substantial question whether the Exchange Offer is
permitted by applicable federal law, the Company has agreed to seek a no-action
letter or other favorable decision from the Commission allowing the Company to
consummate the Exchange Offer.
 
     If the Exchange Offer is not permitted by applicable federal law, the
Company may terminate the Exchange Offer. In connection therewith, the Company
may (i) refuse to accept any Original Notes and return any Original Notes that
have been tendered by the holders thereof, (ii) extend the Exchange offer and
retain all Original Notes tendered prior to the Expiration of the Exchange
Offer, subject to the rights of such holders of tendered Original Notes to
withdraw their tendered Original Notes, or (iii) waive such termination event
with respect to the Exchange Offer and accept all properly tendered Original
Notes that have not been withdrawn. If such waiver constitutes a material change
in the Exchange Offer, the Company will disclose such change by means of a
supplement to this Prospectus that will be distributed to each registered holder
of Original Notes, and the Company will extend the Exchange Offer for a period
of five to ten business days, depending upon the significance of the waiver and
the manner of disclosure to the registered holders of the Original Notes, if the
Exchange Offer would otherwise expire during such period.
 
                                       104
<PAGE>   106
 
EXCHANGE AGENT
 
     State Street Bank and Trust Company has been appointed as "Exchange Agent"
for the Exchange Offer. Questions and requests for assistance and requests for
additional copies of this Prospectus or of the Letter of Transmittal and other
documents should be directed to the Exchange Agent addressed as follows:
 
<TABLE>
<CAPTION>
         BY EXPRESS:                       BY MAIL:                         BY HAND:
                              (insured or registered recommended)
  <S>                         <C>                                  <C>
    State Street Bank and         State Street Bank and Trust        State Street Bank and
            Trust                           Company                          Trust
           Company                Corporate Trust Department                Company
  Corporate Trust Department        Two International Place        Corporate Trust Department
   Two International Place             Boston, MA 02210             Two International Place
       Boston, MA 02210               Attn: Lena Altomare               Boston, MA 02210
     Attn: Lena Altomare                                              Attn: Lena Altomare
</TABLE>
 
                                   FACSIMILE:
                                 (617) 664-5371
 
                                FOR INFORMATION:
                                 (617) 664-5607
 
FEES AND EXPENSES
 
     The expenses of soliciting tenders pursuant to the Exchange Offer will be
borne by the Company. The principal solicitation is being made by mail.
Additional solicitations may be made by officers and regular employees of the
Company and its affiliates in person, by telegraph or telephone.
 
     The Company will not make any payments to brokers, dealers or other persons
soliciting acceptances of the Exchange Offer. The Company, however, will pay the
Exchange Agent reasonable and customary fees for its services and will reimburse
the Exchange Agent for its reasonable out-of-pocket expenses in connection
therewith. The Company may also pay brokerage houses and other custodians,
nominees and fiduciaries the reasonable out-of-pocket expenses incurred by them
in forwarding copies of this Prospectus, Letters of Transmittal and related
documents to the beneficial owners of the Original Notes and in handling or
forwarding tenders for exchange.
 
   
     The expenses to be incurred in connection with the Exchange Offer,
including fees and expenses of the Exchange Agent and Trustee, accounting and
legal fees and printing costs, will be paid by the Company and are estimated to
be approximately $200,000.
    
 
     The tendering Holder will pay all transfer taxes, if any, applicable to the
exchange of Original Notes pursuant to the Exchange Offer.
 
ACCOUNTING TREATMENT
 
     The terms of the Original Notes are not expected to be materially different
from those of the Exchange Notes. Accordingly, no gain or loss for accounting
purposes will be recognized. The expenses of the Exchange Offer will be
amortized over the term of the Exchange Notes.
 
RESALE OF THE EXCHANGE NOTES; PLAN OF DISTRIBUTION
 
     Based on no-action letters issued by the staff of the Commission to third
parties, the Company believes that the Exchange Notes issued pursuant to the
Exchange Offer in exchange for Original Notes may be offered for resale, resold
and otherwise transferred by any holder thereof (other than (i) a broker-dealer
who purchased such Original Notes directly from the Company or an "affiliate" of
the Company within the meaning of Rule 405 under the Securities Act to resell
pursuant to Rule 144A or any other available exemption under the Securities Act
or (ii) a person that is such an affiliate) without compliance with the
registration and prospectus delivery requirements of the Securities Act,
provided that the holder is acquiring
 
                                       105
<PAGE>   107
 
the Exchange Notes in its ordinary course of business and is not participating,
and has no arrangement or understanding with any person to participate, in the
distribution of the Exchange Notes. Holders of Original Notes wishing to accept
the Exchange Offer must represent to the Company that such conditions have been
met. In the event that the Company's belief is inaccurate, holders of Exchange
Notes who transfer Exchange Notes in violation of the prospectus delivery
provisions of the Securities Act and without an exemption from registration
thereunder may incur liability under the Securities Act. The Company does not
assume or indemnify holders against such liability.
 
     Each affiliate of the Company must acknowledge that such person will comply
with the registration and prospectus delivery requirements of the Securities Act
to the extent applicable. Each Participating Broker-Dealer that receives
Exchange Notes in exchange for Original Notes held for its own account, as a
result of market-making or other trading activities, must acknowledge that it
will deliver a prospectus in connection with any resale of such Exchange Notes.
Although a Participating Broker-Dealer may be an "underwriter" within the
meaning of the Securities Act, the Letter of Transmittal states that by so
acknowledging and by delivering a prospectus, such Participating Broker-Dealer
will not be deemed to admit that it is an "underwriter" within the meaning of
the Securities Act. This Prospectus, as it may be amended or supplemented from
time to time, may be used by such Participating Broker-Dealer in connection with
resales of Exchange Notes received in exchange for Original Notes. The Company
has agreed that, for a period of 180 days, it will make this Prospectus and any
amendment or supplement to this Prospectus available to any such Participating
Broker-Dealer for use in connection with any such resale.
 
                                       106
<PAGE>   108
 
                        DESCRIPTION OF OTHER OBLIGATIONS
 
PLY GEM CREDIT FACILITY
 
     In connection with the Ply Gem Acquisition, a syndicate of lenders and
Fleet National Bank, as sole administrative and collateral agent for itself and
the other lenders, entered into a credit facility (as amended, the "Ply Gem
Credit Facility") to refinance a portion of Ply Gem's existing indebtedness. At
February 9, 1999, the aggregate amount of the debt outstanding under the Ply Gem
Credit Facility was approximately $78.4 million. Ply Gem has made mandatory
prepayments in 1998 of approximately $25.5 million with proceeds from asset
sales through February 9, 1999.
 
     The Ply Gem Credit Facility provides Ply Gem with a term loan and letters
of credit. Under the Ply Gem Credit Facility, the term loan and the letters of
credit were issued contemporaneously with the closing of the acquisition of Ply
Gem (the "Ply Gem Credit Facility Closing Date") and will mature on the fifth
anniversary of the Ply Gem Credit Facility Closing Date.
 
     Term loans under the Ply Gem Credit Facility, at the option of Ply Gem,
bear interest at a rate equal to: (i) a fluctuating interest rate per annum in
effect from time to time, equal to the higher of (A) the prime rate publicly
announced by Fleet and (B) 1/2 of one percent per annum above the federal funds
rate; or (ii) the London InterBank Offer Rate plus a spread, which spread
fluctuates between 30 and 95 basis points based on certain financial ratios of
Ply Gem; provided, however, that the applicable interest rate will increase by
200 basis points during the continuance of any monetary default or event of
default. Interest on the term loans under the Ply Gem Credit Facility is payable
quarterly in arrears. In addition, Ply Gem pays a facility fee on the aggregate
principal amount available under the Ply Gem Credit Facility, which fluctuates
between 20 and 30 basis points based on certain financial ratios of Ply Gem. The
facility fee is payable quarterly in arrears.
 
     The Ply Gem Credit Facility is secured by a first-priority lien on (i) all
shares of capital stock of substantially all of Ply Gem's present operating
subsidiaries, (ii) all of the present and future accounts receivable and
inventory of Ply Gem and its operating Subsidiaries and (iii) all proceeds and
products of the foregoing. In addition, Ply Gem and substantially all of its
present operating subsidiaries have guaranteed the Ply Gem Credit Facility.
 
     After mandatory prepayments through December 18, 1998 the Ply Gem Credit
Facility requires Ply Gem to make a principal payment of $78.4 million on August
26, 2002. Ply Gem is also required to make mandatory prepayments of a portion of
the net proceeds of asset sales. Ply Gem may prepay borrowings under the Ply Gem
Credit Facility, in whole or in part without premium or penalty. Borrowings
outstanding under the Ply Gem Credit Facility are due and payable no later than
the fifth anniversary of the Ply Gem Credit Facility Closing Date.
 
     The Ply Gem Credit Facility contains representations and warranties,
covenants (including, without limitation, the financial covenants described
below) and events of default customary for credit facilities of such type,
except that there are no restrictions on the payment of dividends by Ply Gem
unless a default exists, or would result from the payment of such dividend,
under the Ply Gem Credit Facility.
 
     The Ply Gem Credit Facility requires Ply Gem at all times to have
consolidated net worth of at least $375 million, less up to $25 million in
losses on the sale by Ply Gem of certain unprofitable subsidiaries. Under the
Ply Gem Credit Facility, Ply Gem also is required to maintain (i) a ratio of
consolidated current assets to consolidated current liabilities that equals or
exceeds 2.0 to 1.0 and (ii) a ratio of consolidated EBITDA to consolidated
interest expense of at least 3.5 to 1.0 Furthermore, Ply Gem must not permit its
consolidated funded debt to consolidated EBITDA for the four most recent
consecutive full fiscal quarters to exceed the following amounts: 3.5 to 1.0
until September 30, 1998; 3.0 to 1.0 on December 31, 1998; 2.75 to 1.0 on March
31, 1999; 2.5 to 1.0 on June 30, 1999; and 2.0 to 1.0 on June 30, 2000 and
thereafter.
 
OTHER OBLIGATIONS
 
     In February 1994, the Company issued $218,500,000 principal amount of the
9 7/8% Notes. The indenture governing the 9 7/8% Notes (the "9 7/8% Indenture")
restricts, among other things, the payment of cash
                                       107
<PAGE>   109
 
dividends, repurchase of the Company's capital stock and the making of certain
other restricted payments, the incurrence of additional indebtedness, the making
of certain investments, mergers, consolidations and sale of assets (all as
defined in the 9 7/8% Indenture). Upon certain asset sales (as defined in the
9 7/8% Indenture), the Company will be required to offer to purchase, at 100%
principal amount plus accrued interest to the date of purchase, the 9 7/8% Notes
in a principal amount equal to any net cash proceeds (as defined in the 9 7/8%
Indenture) that are not invested in properties and assets used primarily in the
same or related business to those owned and operated by the Company at the issue
date of the 9 7/8% Notes or at the date of such asset sale and such net cash
proceeds were not applied to permanently reduce Senior Indebtedness (as defined
in the 9 7/8% Indenture). The 9 7/8% Notes are redeemable at the option of the
Company, in whole or in part, at any time and from time to time, at 104.214% on
March 1, 1999, declining to 100% on March 1, 2002 and thereafter. The payment of
the principal of, premium, if any, and interest on the 9 7/8% Notes is
subordinated in right of payment to the prior payment of all Senior Indebtedness
(as defined in the 9 7/8% Indenture).
 
     In March 1997, the Company issued $175,000,000 principal amount of the
9 1/4% Notes. The indenture governing the 9 1/4% Notes (the "9 1/4% Indenture")
restricts, among other things, the payment of cash dividends, repurchase of the
Company's capital stock and the making of certain other restricted payments, the
incurrence of additional indebtedness, the making of certain investments,
mergers, consolidations and sales of assets (all as defined in the 9 1/4%
Indenture). Upon certain asset sales (as defined in the 9 1/4% Indenture), the
Company will be required to offer to purchase, at 100% principal amount plus
accrued interest to the date of purchase, the 9 1/4% Notes in a principal amount
equal to any net cash proceeds (as defined in the 9 1/4% Indenture) that are not
invested in properties and assets used primarily in the same or related business
to those owned and operated by the Company at the issue date of the 9 1/4% Notes
or at the date of such asset sale and such net cash proceeds were not applied to
permanently reduce other indebtedness of the Company (other than the
indebtedness which is subordinated by its terms to the 9 1/4% Notes). The 9 1/4%
Notes are redeemable at the option of the Company, in whole or in part, at any
time and from time to time, at 104.625% on March 15, 2002, declining to 100% on
March 15, 2005 and thereafter.
 
     In August 1997, the Company issued $310,000,000 principal amount of the
9 1/8% Notes. The indenture governing the 9 1/8% Notes (the "9 1/8% Indenture")
restricts, among other things, the payment of cash dividends, repurchase of the
Company's capital stock and the making of certain other restricted payments, the
incurrence of additional indebtedness, the making of certain investments,
mergers, consolidations and sales of assets (all as defined in the 9 1/8%
Indenture). Upon certain asset sales (as defined in the 9 1/8% Indenture), the
Company will be required to offer to purchase, at 100% principal amount plus
accrued interest to the date of purchase, the 9 1/8% Notes in a principal amount
equal to any net cash proceeds (as defined in the 9 1/8% Indenture) that are not
invested in properties and assets used primarily in the same or related business
to those owned and operated by the Company at the issue date of the 9 1/8% Notes
or at the date of such asset sale and such net cash proceeds were not applied to
permanently reduce other indebtedness of the Company (other than the
indebtedness which is subordinated by its terms to the 9 1/8% Notes). The 9 1/8%
Notes are redeemable at the option of the Company, in whole or in part, at any
time and from time to time, at 104.563% on September 1, 2002, declining to 100%
on September 1, 2005 and thereafter.
 
     As of October 3, 1998, the Company's Canadian subsidiary, Broan Limited,
had $5.8 million in secured borrowings (based on exchange rates in effect on
October 3, 1998). The line of credit contains a covenant prohibiting net
aggregate dividends or other distributions to the Company from Broan Limited in
excess of $10.8 million. As of October 3, 1998, $6.5 million in dividends or
other distributions could have been made to the Company by Broan Limited under
this covenant.
 
NUTONE
 
     As of July 31, 1998, NuTone had letters of credit and a Canadian credit
line supporting aggregate obligations of approximately $3.2 million. In
connection with the Acquisition, Nortek cancelled the Canadian credit line and
entered into a $10,000,000 standby and trade letter of credit facility which a
portion is being used to back up aggregate obligations of NuTone of
approximately $1.8 million at October 3, 1998. The Company is contingently
liable for performance under those letters of credit. The standby and trade
letter of credit facility is collateralized by marketable securities The letters
of credit have an expiration date of the
 
                                       108
<PAGE>   110
 
earlier of 180 days after issuance or July 28, 1999 and a fee of 25 basis points
per annum is payable on the date of issuance of a standby letter of credit.
 
     For additional information regarding the obligations described above, see
Note 5 of Notes to Consolidated Financial Statements of the Company included
elsewhere herein.
 
                      MATERIAL FEDERAL TAX CONSIDERATIONS
 
     The following summarizes the material United States federal income tax
consequences of the receipt, ownership and disposition of the Exchange Notes to
United States Holders (as defined below) and Foreign Holders (as defined below).
This discussion is based on currently existing provisions of the Internal
Revenue Code of 1986, as amended (the "Code"), existing and proposed Treasury
regulations promulgated thereunder, and administrative and judicial
interpretations thereof, all as in effect or proposed on the date hereof and all
of which are subject to change, possibly with retroactive effect, or to
different interpretations. This discussion does not address the tax consequences
to subsequent purchasers of Exchange Notes and is limited to Holders who hold
the Exchange Notes as capital assets, within the meaning of Section 1221 of the
Code. This discussion also does not address the tax consequences to nonresident
aliens or foreign corporations that are subject to United States federal income
tax on a net basis on income realized with respect to an Exchange Note because
such income is effectively connected with the conduct of a U.S. trade or
business. Such Holders are generally taxed in a similar manner to United States
Holders; however, certain special rules apply. Moreover, this discussion is for
general information only and does not address all of the tax consequences that
may be relevant to particular Holders in light of their personal circumstances
or to certain types of Holders (such as certain financial institutions,
insurance companies, tax-exempt entities, dealers in securities or persons who
have hedged a risk of ownership of a Note).
 
     No ruling from the Internal Revenue Service ("IRS") will be requested with
respect to any of the matters discussed herein. There can be no assurance that
the IRS will not take a different position concerning the tax consequences of
the receipt, ownership, or disposition of the Notes, or that any such position
would be sustained. BECAUSE INDIVIDUAL CIRCUMSTANCES MAY DIFFER, EACH
PROSPECTIVE HOLDER OF EXCHANGE NOTES IS STRONGLY URGED TO CONSULT HIS OR HER OWN
TAX ADVISOR WITH RESPECT TO HIS OR HER PARTICULAR SITUATION, AND AS TO ANY
FEDERAL, FOREIGN, STATE, LOCAL OR OTHER TAX CONSIDERATIONS (INCLUDING ANY
POSSIBLE CHANGES IN TAX LAW OR INTERPRETATIONS THEREOF) AFFECTING THE RECEIPT,
HOLDING AND DISPOSITION OF THE EXCHANGE NOTES.
 
TAX CONSEQUENCES TO UNITED STATES HOLDERS
 
     As used herein, the term "United States Holder" means a holder of Exchange
Notes, that is, for United Stated federal income tax purposes, (a) a citizen or
resident of the United States, (b) treated as a domestic corporation or domestic
partnership, or (c) an estate or trust other than a "foreign estate" or "foreign
trust" as defined in section 7701(a)(31) of the Code.
 
     Exchange of Original Notes for Exchange Notes.  The exchange by a United
States Holder of an Original Note for an Exchange Note pursuant to the Exchange
Offer will not constitute a taxable exchange of the Original Note if the
economic terms of the Exchange Note (including the interest rate) are identical
to the economic terms of the Original Note. Under recently promulgated Treasury
regulations relating to modifications and exchanges of debt instruments (the
"Section 1001 Regulations"), even if Liquidated Damages were payable with
respect to the Original Notes but not with respect to the Exchange Notes as a
result of a Registration Default as described under "The Exchange
Offer -- Registration Rights; Liquidated Damages", the exchange of an Original
Note for an Exchange Note would not be treated as a taxable exchange, as such
Liquidated Damages payments would occur pursuant to the original terms of the
Original Note. Accordingly, the Company intends to take the position that in the
circumstances described in the preceding sentence, the exchange will not
constitute a taxable exchange of the Original Note.
 
                                       109
<PAGE>   111
 
     Interest on Exchange Notes.  Interest on the Exchange Notes generally will
be includible in the income of a United States Holder as ordinary income at the
time such interest is received or accrued, in accordance with such Holder's
method of accounting for United States federal income tax purposes. Since the
Original Notes were issued with original issue discount ("OID") that was less
than 1/4 of 1 percent of the stated redemption price at maturity, multiplied by
the number of complete years to maturity, the Original Notes qualified for the
de minimis exception from the imputed OID interest rules and, therefore, so will
the Exchange Notes.
 
     Sale, Exchange, Redemption or Retirement.  Upon the sale, exchange,
redemption, retirement or other taxable disposition of an Exchange Note, a
United States Holder will generally recognize taxable gain or loss equal to the
difference between the amount realized on the sale, exchange, redemption or
retirement and such Holder's adjusted tax basis in the Exchange Note. A United
States Holder's adjusted tax basis in an Exchange Note generally will equal the
cost of the Original Note to such Holder. Gain or loss recognized on the
disposition of an Exchange Note generally will be capital gain or loss and will
be long-term capital gain or loss if, at the time of such disposition, the
Exchange Note has been held for more than one year.
 
     Backup Withholding.  Certain Holders of Exchange Notes may be subject to
backup withholding at the rate of 31% with respect to interest and cash received
in certain circumstances upon the disposition of such Exchange Notes. Generally,
backup withholding will be applied only if the Holder fails to furnish to the
Company its taxpayer identification number ("TIN") (social security or employer
identification number) in the prescribed manner, the IRS notifies the Company
that the TIN furnished by the Holder is incorrect, the Holder fails to certify
under the penalty of perjury that such Holder is not subject to backup
withholding, or the Holder fails to otherwise comply with the applicable
requirements of the backup withholding rules. Any amount withheld under the
backup withholding rules will be allowed as a credit or refund against a United
States Holder's United States federal income tax liability, provided that such
United States Holder furnished the required information to the IRS. Certain
Holders (including, among others, corporations) are not subject to the backup
withholding requirements.
 
UNITED STATES FEDERAL TAXATION OF FOREIGN HOLDERS
 
     This section discusses special rules applicable to a Holder of Exchange
Notes that is a Foreign Holder. For purposes of this discussion, a "Foreign
Holder" means a Holder that is not a United States Holder.
 
     Interest on Exchange Notes.  In general, interest received by any Foreign
Holder will not be subject to United States federal withholding tax, provided
that (a) (i) the Holder does not actually or constructively own 10% or more of
the total combined voting power of all classes of stock of the Company entitled
to vote, (ii) the Holder is not a "bank" within the meaning of Section
881(c)(3)(A) of the Code, (iii) the Holder is not a controlled foreign
corporation that is related to the Company actually or constructively through
stock ownership and (iv) either (x) the beneficial owner of the Note provides
the Company or its agent a properly executed certification on IRS Form W-8 (or a
suitable substitute or successor form) signed under the penalties of perjury
providing the beneficial owner's name and address and certifying that it is not
a United States Holder or (y) a securities clearing organization, bank or other
financial institution that holds customers' securities in the ordinary course of
its trade or business (a "financial institution") holds the Exchange Note and
certifies to the Company or its agent under penalties of perjury that the IRS
Form W-8 (or a suitable substitute or successor form) has been received by it
from the beneficial owner of the Exchange Note or a qualifying intermediary and
furnishes the payor a copy thereof or (b) the foreign Holder is entitled to the
benefits of an income tax treaty under which the interest on the Exchange Notes
is exempt from United States withholding tax and the Foreign Holder or such
Holder's agent provides a properly executed IRS Form 1001 or successor form in
the name of the beneficial owner claiming the exemption. Payments of interest
not exempt from U.S. federal withholding tax as described above will be subject
to such withholding tax at a rate of 30% (subject to reduction under an
applicable income tax treaty if a properly executed Form 1001 is provided).
 
     Gain on Disposition of Exchange Notes.  A Foreign Holder generally will not
be subject to United States federal income tax or withholding tax with respect
to gain recognized on a disposition of the Exchange Notes, unless (i) in the
case of a Foreign Holder that is an individual, such Foreign Holder is present
in the United
 
                                       110
<PAGE>   112
 
States for 183 or more days in the taxable year of the disposition and certain
other requirements are met, or (ii) the Foreign Holder is an individual who is a
former citizen of the United States who lost such citizenship within the
preceding ten-year period (or former long-term permanent resident of the United
States who relinquished residency on or after February 6, 1995) whose loss of
citizenship or permanent residency had as one of its principal purposes the
avoidance of United States tax. If a Foreign Holder falls under (i) above, the
Holder generally will be subject to United States federal income tax at a rate
of 30% on the gain derived from the sale (or reduced treaty rate) and may be
subject to withholding in certain circumstances. If a Foreign Holder falls
within clause (ii) above, the Holder will be taxed on the net gain derived from
the sale under the graduated United States federal income tax rates that are
applicable to U.S. citizens and may be subject to withholding under certain
circumstances.
 
     Information Reporting and Backup Withholding.  Under current Treasury
regulations, backup withholding and information reporting on Form 1099 do not
apply to payments made by the Company or a paying agent to Foreign Holders if
the certification described in part (iv) of the first sentence under "Interest
on Exchange Notes" is received, provided that the payor does not have actual
knowledge that the Holder is a United States Holder. If any payments of
principal and interest are made to the beneficial owner of an Exchange Note
outside the United States by or through the foreign office of a foreign
custodian, foreign nominee or other foreign agent of such beneficial owner, or
if the foreign office of a foreign "broker" (as defined in applicable United
States Treasury Department regulations) pays the proceeds of the sale of an
Exchange Note to the seller thereof, backup withholding and information
reporting will not apply. Information reporting requirements (but not backup
withholding) will apply, however, to payments by a foreign office of a broker or
custodian that is (a) a United States person, (b) derives 50% or more of its
gross income for certain periods from the conduct of a trade or business in the
United States, or (c) a "controlled foreign corporation" (generally, a foreign
corporation controlled by certain United States shareholders) with respect to
the United States, unless the broker or custodian has documentary evidence in
its records that the Holder is a Foreign Holder and certain other conditions are
met (including that the broker has no actual knowledge that the holder is a
United States Holder), or the Holder otherwise establishes an exemption. Payment
by a United States office of a broker, nominee agent or custodian is subject to
both backup withholding at a rate of 31% and information reporting unless the
Holder certifies under penalties of perjury that it is a Foreign Holder, or
otherwise establishes an exemption. A Foreign Holder may obtain a refund of, or
a credit against such Holder's U.S. federal income tax liability for any amounts
withheld under the backup withholding rules, provided the required information
is furnished to the IRS.
 
     Prospective Final Regulations.  On October 6, 1997 the Internal Revenue
Service released regulations that revise the procedures for withholding tax on
interest and the associated backup withholding and information reporting rules
described above for payments of interest and gross proceeds made after December
31, 1999. The regulations modify the requirements imposed on a Foreign Holder or
certain intermediaries for establishing the recipient's status as a Foreign
Holder eligible for exemption from withholding tax and backup withholding. In
particular, the final regulations impose more stringent conditions on the
ability of financial intermediaries acting for a Foreign Holder to provide
certifications on behalf of the Foreign Holder, which may include entering into
an agreement with the Internal Revenue Service to audit certain documentation
with respect to such certifications. Foreign Holders should consult their tax
advisors to determine the effects of the application on these regulations to
their particular circumstances.
 
                              PLAN OF DISTRIBUTION
 
     Each Participating Broker-Dealer that receives Exchange Notes for its own
account pursuant to the Exchange Offer must acknowledge that it will deliver a
prospectus in connection with any resale of such Exchange Notes. This
Prospectus, as it may be amended or supplemented from time to time, may be used
by a Participating Broker-Dealer in connection with resales of Exchange Notes
received in exchange for Original Notes where such Original Notes were acquired
as a result of market-making activities or other trading activities. The Company
has agreed that for a period of 180 days it will make this Prospectus, as
amended or supplemented, available to any Participating Broker-Dealer for use in
connection with any such resales.
 
                                       111
<PAGE>   113
 
     The Company will not receive any proceeds from any sale of Exchange Notes
by Participating Broker-Dealers. Exchange Notes received by Participating
Broker-Dealers for their own account pursuant to the Exchange Offer may be sold
from time to time in one or more transactions in the over-the-counter market, in
negotiated transactions, through the writing of options on the Exchange Notes or
a combination of such methods of resale, at market prices prevailing at the time
of resale, at prices related to such prevailing market prices or negotiated
prices. Any such resale may be made directly to purchasers or to or through
brokers or dealers who may receive compensation in the form of commissions or
concessions from any such Participating Broker-Dealer and/or the purchasers of
any such Exchange Notes. Any Participating Broker-Dealer that resells Exchange
Notes that were received by it for its own account pursuant to the Exchange
Offer and any broker or dealer that participates in a distribution of such
Exchange Notes may be deemed to be an "underwriter" within the meaning of the
Securities Act and any profit on any such resale of Exchange Notes and any
commission or concessions received by any such persons may be deemed to be
underwriting compensation under the Securities Act. The Letter of Transmittal
states that by acknowledging that it will deliver, and by delivering a
prospectus, a Participating Broker-Dealer will not be deemed to admit that it is
an "underwriter" within the meaning of the Securities Act.
 
     For a period of 180 days from the date of the consummation of the Exchange
Offer, the Company will promptly send additional copies of this Prospectus and
any amendment or supplement to this Prospectus to any Participating
Broker-Dealer that requests such documents in the Letter of Transmittal.
 
                                 LEGAL MATTERS
 
     The legality of the Exchange Notes being offered hereby will be passed upon
for the Company by Ropes & Gray, Boston, Massachusetts and Paul, Hastings,
Janofsky & Walker LLP, New York, New York.
 
                                    EXPERTS
 
     The audited consolidated financial statements and schedules of Nortek, Inc.
and subsidiaries as of December 31, 1996 and 1997 and for each of the three
years in the period ended December 31, 1997 set forth or incorporated by
reference in this Prospectus have been audited by Arthur Andersen LLP,
independent public accountants, with respect thereto, and are included herein in
reliance upon the authority of said firm as experts in giving said reports.
 
     The audited consolidated financial statements and schedule of Ply Gem as of
December 31, 1995 and 1996 and for each of the three years in the period ended
December 31, 1996 incorporated by reference in this Prospectus have been audited
by Grant Thornton LLP, independent public accountants, as indicated in their
report with respect thereto.
 
   
     The audited consolidated financial statements of NuTone Inc. and its
subsidiary as of December 31, 1997 and for the year then ended set forth in this
Prospectus have been audited by PricewaterhouseCoopers LLP, independent public
accountants, as indicated in their report, which includes an explanatory
paragraph disclosing the Company has not utilized "push down" accounting in
accordance with generally accepted accounting principles, as established by the
Securities and Exchange Commission for public companies, with respect thereto.
    
 
                                       112
<PAGE>   114
 
                   INDEX TO CONSOLIDATED FINANCIAL STATEMENTS
 
<TABLE>
<CAPTION>
                                                              PAGE NO.
               NORTEK, INC. AND SUBSIDIARIES                  --------
<S>                                                           <C>
Report of Independent Public Accountants....................     F-2
Consolidated Statement of Operations for each of the three
  years in the period ended December 31, 1997, and the nine
  months ended September 27, 1997 (unaudited) and October 3,
  1998 (unaudited)..........................................     F-3
Consolidated Balance Sheet as of December 31, 1996 and 1997,
  and October 3, 1998
  (unaudited)...............................................     F-4
Consolidated Statement of Cash Flows for each of the three
  years in the period ended December 31, 1997, and the nine
  months ended September 27, 1997 (unaudited) and October 3,
  1998 (unaudited)..........................................     F-6
Consolidated Statement of Stockholders' Investment for each
  of the three years in the period ended December 31, 1997,
  and the nine months ended October 3, 1998 (unaudited).....     F-7
Notes to Consolidated Financial Statements..................     F-8
</TABLE>
 
NUTONE INC. AND SUBSIDIARY
 
<TABLE>
<S>                                                           <C>
Report of Independent Public Accountants....................    F-30
Consolidated Balance Sheet as of December 31, 1997 and July
  4, 1998 (unaudited).......................................    F-31
Consolidated Statement of Operations for the year ended
  December 31, 1997 and the six months ended June 28, 1997
  and July 4, 1998..........................................    F-32
Consolidated Statement of Shareholder's Net Investment for
  the year ended December 31, 1997 and the six months ended
  June 28, 1997 and July 4, 1998............................    F-33
Consolidated Statement of Cash Flows for the year ended
  December 31, 1997 and the six months ended June 28, 1997
  and July 4, 1998..........................................    F-34
Notes to Consolidated Financial Statements..................    F-35
</TABLE>
 
                                       F-1
<PAGE>   115
 
                         NORTEK, INC. AND SUBSIDIARIES
 
                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
To Nortek, Inc.:
 
     We have audited the accompanying consolidated balance sheets of Nortek,
Inc. (a Delaware corporation) and subsidiaries (the "Company") as of December
31, 1997 and 1996, and the related statements of operations, stockholders'
investment and cash flows for each of the three years in the period ended
December 31, 1997. These financial statements are the responsibility of the
Company's management. Our responsibility is to express an opinion on these
financial statements based on our audits.
 
     We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audits to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
     In our opinion, the financial statements referred to above present fairly,
in all material respects, the financial position of Nortek, Inc. and
subsidiaries as of December 31, 1997 and 1996, and the results of their
operations and their cash flows for each of the three years in the period ended
December 31, 1997 in conformity with generally accepted accounting principles.
 
                                            ARTHUR ANDERSEN LLP
 
Boston, Massachusetts,
March 9, 1998
 
                                       F-2
<PAGE>   116
 
                         NORTEK, INC. AND SUBSIDIARIES
                      CONSOLIDATED STATEMENT OF OPERATIONS
 
<TABLE>
<CAPTION>
                                                                              NINE MONTHS ENDED
                                     FOR THE YEARS ENDED DECEMBER 31,     --------------------------
                                    ----------------------------------    SEPTEMBER 27,   OCTOBER 3,
                                      1995        1996         1997           1997           1998
                                      ----        ----         ----       -------------   ----------
                                                                                 (UNAUDITED)
                                                (IN THOUSANDS EXCEPT PER SHARE AMOUNTS)
<S>                                 <C>         <C>         <C>           <C>             <C>
Net Sales.........................  $656,800    $841,557    $1,134,129      $718,413      $1,300,308
Costs and Expenses:
Cost of products sold.............   469,828     597,394       826,453       515,787         960,168
Amortization of acquired
  goodwill........................     2,458       2,904         5,319         2,861           8,784
Selling, general and
  administrative
  expense.........................   141,541     180,308       219,376       144,159         234,222
                                    --------    --------    ----------      --------      ----------
                                     613,827     780,606     1,051,148       662,807       1,203,174
                                    --------    --------    ----------      --------      ----------
Operating earnings................    42,973      60,951        82,981        55,606          97,134
Interest expense..................   (22,993)    (28,400)      (50,210)      (31,089)        (62,126)
Investment income.................     8,120       6,049         9,929         7,683           7,492
                                    --------    --------    ----------      --------      ----------
Earnings from continuing
  operations before provision for
  income taxes....................    28,100      38,600        42,700        32,200          42,500
Provision for income taxes........    10,600      14,900        16,300        11,400          19,400
                                    --------    --------    ----------      --------      ----------
Earnings from continuing
  operations before extraordinary
  loss............................    17,500      23,700        26,400        20,800          23,100
Earnings (loss) from discontinued
  operations......................    (2,500)     (1,700)       (5,200)       (2,700)            600
Extraordinary loss from debt
  retirement......................        --          --            --            --            (100)
                                    --------    --------    ----------      --------      ----------
Net Earnings......................  $ 15,000    $ 22,000    $   21,200      $ 18,100      $   23,600
                                    ========    ========    ==========      ========      ==========
EARNINGS PER SHARE:
Earnings from continuing
  operations before extraordinary
  loss:
     Basic........................  $   1.41    $   2.26    $     2.75      $   2.16      $     2.17
     Diluted......................  $   1.39    $   2.23    $     2.68      $   2.11      $     2.13
Earnings (loss) from discontinued
  operations:
     Basic........................  $   (.20)   $   (.16)   $     (.54)     $   (.29)     $      .05
     Diluted......................  $   (.20)   $   (.16)   $     (.53)     $   (.28)     $      .05
Extraordinary loss from debt
  retirement:
     Basic........................  $     --    $     --    $       --      $     --      $     (.01)
     Diluted......................  $     --    $     --    $       --      $     --      $     (.01)
NET EARNINGS:
     Basic........................  $   1.21    $   2.10    $     2.21      $   1.87      $     2.21
                                    ========    ========    ==========      ========      ==========
     Diluted......................  $   1.19    $   2.07    $     2.15      $   1.83      $     2.17
                                    ========    ========    ==========      ========      ==========
Weighted Average Number of Shares:
     Basic........................    12,445      10,485         9,605         9,632          10,660
                                    ========    ========    ==========      ========      ==========
     Diluted......................    12,569      10,641         9,855         9,878          10,858
                                    ========    ========    ==========      ========      ==========
</TABLE>
 
   The accompanying notes are an integral part of these financial statements
                                       F-3
<PAGE>   117
 
                         NORTEK, INC. AND SUBSIDIARIES
                           CONSOLIDATED BALANCE SHEET
 
<TABLE>
<CAPTION>
                                                               DECEMBER 31,
                                                          ----------------------    OCTOBER 3,
                                                            1996         1997          1998
                                                            ----         ----       ----------
                                                                                    (UNAUDITED)
                                                                 (AMOUNTS IN THOUSANDS)
<S>                                                       <C>         <C>           <C>
                         ASSETS
CURRENT ASSETS:
Unrestricted
     Cash and cash equivalents..........................  $ 41,042    $  125,842    $   99,201
     Marketable securities available for sale...........    51,051        35,988       102,197
Restricted
     Investments and marketable securities at cost,
       which approximates market........................     5,681         6,348         6,403
Accounts receivable, less allowances of $3,656, $11,047
  and
  $13,512...............................................   108,202       180,414       237,628
Inventories
     Raw materials......................................    35,160        72,693        66,267
     Work in process....................................    11,688        18,399        19,545
     Finished goods.....................................    43,141        85,161       100,205
                                                          --------    ----------    ----------
                                                            89,989       176,253       186,017
                                                          --------    ----------    ----------
Prepaid expenses........................................     4,736         8,391        10,863
Other current assets....................................     9,209        12,627        14,352
Net assets of a discontinued operations.................    24,789        22,386            --
Prepaid income taxes....................................    20,000        46,800        42,847
                                                          --------    ----------    ----------
          Total current assets..........................   354,699       615,049       699,508
                                                          --------    ----------    ----------
PROPERTY AND EQUIPMENT, AT COST:
Land....................................................     6,461        12,081        12,420
Buildings and improvements..............................    62,756        96,606        96,221
Machinery and equipment.................................   152,454       250,677       271,342
                                                          --------    ----------    ----------
                                                           221,671       359,364       379,983
Less accumulated depreciation...........................   100,124       116,841       123,476
                                                          --------    ----------    ----------
          Total property and equipment, net.............   121,547       242,523       256,507
                                                          --------    ----------    ----------
OTHER ASSETS:
Goodwill, less accumulated amortization of $26,615,
  $31,773 and $40,130...................................    90,679       378,232       607,564
Intangible assets.......................................     4,263         8,752         8,124
Notes receivable and other investments..................     1,379         9,339         9,350
Deferred income taxes...................................        --        10,022        25,041
Deferred debt expense...................................     6,647        21,066        25,436
Other...................................................    11,019        19,563        20,893
                                                          --------    ----------    ----------
                                                           113,987       446,974       696,408
                                                          --------    ----------    ----------
                                                          $590,233    $1,304,546    $1,652,423
                                                          ========    ==========    ==========
</TABLE>
 
   The accompanying notes are an integral part of these financial statements
                                       F-4
<PAGE>   118
 
                         NORTEK, INC. AND SUBSIDIARIES
                           CONSOLIDATED BALANCE SHEET
 
<TABLE>
<CAPTION>
                                                                 DECEMBER 31,        OCTOBER 3,
                                                            ----------------------   -----------
                                                              1996         1997         1998
                                                              ----         ----         ----
                                                                                     (UNAUDITED)
                                                                   (AMOUNTS IN THOUSANDS)
<S>                                                         <C>         <C>          <C>
         LIABILITIES AND STOCKHOLDERS' INVESTMENT
CURRENT LIABILITIES:
Notes payable and other short-term obligations............  $ 25,334    $   11,770   $   10,365
Current maturities of long-term debt......................    11,152         5,969        5,862
Accounts payable..........................................    66,828        91,488      128,562
Accrued expenses and taxes, net...........................    88,252       164,001      172,397
                                                            --------    ----------   ----------
          Total current liabilities.......................   191,566       273,228      317,186
                                                            --------    ----------   ----------
OTHER LIABILITIES:
Deferred income taxes.....................................    17,637            --           --
Other.....................................................    18,466        67,390      112,398
                                                            --------    ----------   ----------
                                                              36,103        67,390      112,398
                                                            --------    ----------   ----------
Notes, Mortgage Notes and Obligations Payable, Less
  Current Maturities......................................   243,769       835,840    1,010,657
                                                            --------    ----------   ----------
Commitments and Contingencies (Note 8)
STOCKHOLDERS' INVESTMENT:
Preference stock, $1 par value; authorized 7,000,000
  shares, none issued.....................................        --            --           --
Common stock, $1 par value; authorized 40,000,000 shares;
  15,965,585, 16,050,794 and 18,417,000 shares issued.....    15,966        16,051       18,417
Special common stock, $1 par value; authorized 5,000,000
  shares; 784,169, 767,287 and 857,447 shares issued......       784           767          857
Additional paid-in capital................................   135,028       135,345      200,829
Retained earnings.........................................    37,766        58,966       82,566
Cumulative translation, pension and other adjustments.....    (3,212)       (5,327)      (6,013)
Less -- treasury common stock at cost, 6,599,645,
  7,032,497 and 7,252,835 shares..........................   (65,805)      (75,779)     (82,516)
     -- treasury special common stock at cost, 276,910,
       285,304 and 286,009 shares.........................    (1,732)       (1,935)      (1,958)
                                                            --------    ----------   ----------
          Total stockholders' investment..................   118,795       128,088      212,182
                                                            --------    ----------   ----------
                                                            $590,233    $1,304,546   $1,652,423
                                                            ========    ==========   ==========
</TABLE>
 
   The accompanying notes are an integral part of these financial statements
                                       F-5
<PAGE>   119
 
                         NORTEK, INC. AND SUBSIDIARIES
                      CONSOLIDATED STATEMENT OF CASH FLOWS
 
<TABLE>
<CAPTION>
                                                 FOR THE YEARS ENDED DECEMBER         NINE MONTHS ENDED
                                                             31,                  --------------------------
                                               --------------------------------   SEPTEMBER 27,   OCTOBER 3,
                                                 1995        1996       1997          1997           1998
                                                 ----        ----       ----      -------------   ----------
                                                                                         (UNAUDITED)
                                                                  (AMOUNTS IN THOUSANDS)
<S>                                            <C>         <C>        <C>         <C>             <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
Earnings from continuing operations..........  $  17,500   $ 23,700   $  26,400     $  20,800     $  23,100
Earnings (loss) from discontinued
  operations.................................     (2,500)    (1,700)     (5,200)       (2,700)          600
Extraordinary loss from debt retirement......         --         --          --            --          (100)
                                               ---------   --------   ---------     ---------     ---------
Net earnings.................................     15,000     22,000      21,200        18,100        23,600
                                               ---------   --------   ---------     ---------     ---------
ADJUSTMENTS TO RECONCILE NET EARNINGS TO
  CASH:
Depreciation and amortization................     15,155     19,831      26,696        17,497        31,043
Non-cash interest expense....................      1,070      1,164       1,711         1,046         2,497
Loss on sale of a discontinued operation
  before income taxes........................         --         --          --            --         2,500
Loss on debt retirement before income
  taxes......................................         --         --          --            --           150
Net gain on investments and marketable
  securities.................................     (2,000)      (750)       (200)           --            --
Deferred federal income tax provision
  (benefit)..................................      1,200     (3,000)      4,000        (3,100)        7,300
Deferred federal income tax (benefit)
  provision on discontinued operations.......        100      1,200      (1,000)           --        (2,300)
CHANGES IN CERTAIN ASSETS AND LIABILITIES,
  NET OF EFFECTS FROM ACQUISITIONS AND
  DISPOSITIONS:
    Accounts receivable, net.................      2,302     (3,729)     10,259       (13,440)      (36,315)
    Prepaids and other current assets........       (781)     3,280       5,699         3,547        (4,492)
    Inventories..............................      5,405     11,828       6,524         1,658       (12,269)
    Net assets of discontinued operations....      1,666        817       4,934        (4,663)       (6,659)
    Accounts payable.........................     (5,299)     1,699     (16,359)       (2,363)       24,346
    Accrued expenses and taxes...............     (2,698)    (7,550)     25,968        20,695        (9,536)
    Long-term assets, liabilities and other,
      net....................................      2,219        583      (4,317)       (3,825)       (3,150)
                                               ---------   --------   ---------     ---------     ---------
         Total adjustments to net earnings...     18,339     25,373      63,915        17,052        (6,885)
                                               ---------   --------   ---------     ---------     ---------
         Net cash provided by operating
           activities........................     33,339     47,373      85,115        35,152        16,715
                                               ---------   --------   ---------     ---------     ---------
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures.........................    (14,859)   (19,267)    (22,464)      (12,989)      (24,185)
Net cash paid for businesses acquired........    (27,543)        --    (407,419)     (386,952)     (242,500)
Purchase of investments and marketable
  securities.................................   (104,762)   (66,901)   (283,918)     (238,199)     (100,512)
Proceeds from the sale of investments and
  marketable securities......................    112,173     82,435     298,158       183,329        36,123
Proceeds from businesses sold, net...........         --         --          --            --        68,947
Other, net...................................       (108)    (1,477)     (7,738)       (3,943)       (7,088)
                                               ---------   --------   ---------     ---------     ---------
      Net cash used in investing
         activities..........................    (35,099)    (5,210)   (423,381)     (458,754)     (269,215)
                                               ---------   --------   ---------     ---------     ---------
CASH FLOWS FROM FINANCING ACTIVITIES:
Sale of notes, net...........................         --         --     466,214       467,663       203,492
Purchase of notes............................         --         --          --            --       (10,511)
Increase in borrowings.......................     10,763      9,609         612            --            --
Payment of borrowings........................     (1,142)   (13,598)    (33,966)      (27,599)      (26,141)
Net proceeds from the sale of Nortek Common
  Stock......................................         --         --          --            --        64,300
Purchase of Nortek Common and Special Common
  Stock......................................     (4,664)   (34,822)    (10,177)       (8,824)       (6,760)
Other, net...................................       (822)       479         383           395         1,479
                                               ---------   --------   ---------     ---------     ---------
      Net cash provided by (used in)
         financing activities................      4,135    (38,332)    423,066       431,635       225,859
                                               ---------   --------   ---------     ---------     ---------
Net increase (decrease) in unrestricted cash
  and cash equivalents.......................      2,375      3,831      84,800         8,033       (26,641)
Unrestricted cash and cash equivalents at the
  beginning of the period....................     34,836     37,211      41,042        41,042       125,842
                                               ---------   --------   ---------     ---------     ---------
Unrestricted cash and cash equivalents at the
  end of the period..........................  $  37,211   $ 41,042   $ 125,842     $  49,075     $  99,201
                                               =========   ========   =========     =========     =========
</TABLE>
 
   The accompanying notes are an integral part of these financial statements
                                       F-6
<PAGE>   120
 
                         NORTEK, INC. AND SUBSIDIARIES
               CONSOLIDATED STATEMENT OF STOCKHOLDERS' INVESTMENT
 
<TABLE>
<CAPTION>
                                                          FOR THE THREE YEARS ENDED DECEMBER 31, 1997
                                                           AND THE NINE MONTHS ENDED OCTOBER 3, 1998
                                     --------------------------------------------------------------------------------------
                                                                                             ACCUMULATED
                                               SPECIAL   ADDITIONAL                             OTHER
                                     COMMON    COMMON     PAID-IN     RETAINED   TREASURY   COMPREHENSIVE    COMPREHENSIVE
                                      STOCK     STOCK     CAPITAL     EARNINGS    STOCK         INCOME           INCOME
                                     ------    -------   ----------   --------   --------   -------------    -------------
                                                                     (AMOUNTS IN THOUSANDS)
<S>                                  <C>       <C>       <C>          <C>        <C>        <C>              <C>
BALANCE, DECEMBER 31, 1995.........  $15,883    $774      $134,690    $15,766    $(33,080)     $(2,742)         $    --
27,697 shares of special common
  stock converted into 27,697
  shares of common stock...........       28     (28)           --         --          --           --               --
54,461 shares of common stock and
  37,500 shares of common stock
  issued upon exercise of stock
  options..........................       55      38           338         --          --           --               --
2,293,065 shares of treasury stock
  acquired.........................       --      --            --         --     (34,457)          --               --
Translation adjustment.............       --      --            --         --          --          138              138
Pension adjustment.................       --      --            --         --          --         (127)            (127)
Unrealized decline in marketable
  securities.......................       --      --            --         --          --         (481)            (481)
Net earnings.......................       --      --            --     22,000          --           --           22,000
                                     -------    ----      --------    -------    --------      -------          -------
Comprehensive income...............                                                                             $21,530
                                                                                                                =======
 
BALANCE, DECEMBER 31, 1996.........  $15,966    $784      $135,028    $37,766    $(67,537)     $(3,212)         $    --
22,690 shares of special common
  stock converted into 22,690
  shares of common stock...........       23     (23)           --         --          --           --               --
62,519 shares of common stock and
  5,808 shares of special common
  stock issued upon exercise of
  stock options....................       62       6           317         --          --           --               --
441,246 shares of treasury stock
  acquired.........................       --      --            --         --     (10,177)          --               --
Translation adjustment.............       --      --            --         --          --       (3,815)          (3,815)
Pension adjustment.................       --      --            --         --          --          919              919
Unrealized appreciation in the
  value of marketable securities...       --      --            --         --          --          781              781
Net earnings.......................       --      --            --     21,200          --           --           21,200
                                     -------    ----      --------    -------    --------      -------          -------
Comprehensive income...............                                                                             $19,085
                                                                                                                =======
 
BALANCE, DECEMBER 31, 1997.........  $16,051    $767      $135,345    $58,966    $(77,714)     $(5,327)         $    --
Sale of 2,182,500 shares of common
  stock............................    2,182      --        62,207         --          --           --               --
10,831 shares of special common
  stock converted into 10,831
  shares of common stock...........       11     (11)           --         --          --           --               --
172,875 shares of common stock and
  100,991 shares of special common
  stock issued upon exercise of
  stock options....................      173     101         3,277         --          --           --               --
221,043 shares of treasury stock
  acquired.........................       --      --            --         --      (6,760)          --               --
Translation adjustment.............       --      --            --         --          --       (1,181)          (1,181)
Minimum pension liability, net of
  $65 tax benefit..................       --      --            --         --          --         (100)            (100)
Unrealized increase in the value of
  marketable securities............       --      --            --         --          --          595              595
Net earnings.......................       --      --            --     23,600          --           --           23,600
                                     -------    ----      --------    -------    --------      -------          -------
Comprehensive income...............                                                                             $22,914
                                                                                                                =======
 
BALANCE, OCTOBER 3, 1998
  (UNAUDITED)......................  $18,417    $857      $200,829    $82,566    $(84,474)     $(6,013)
                                     =======    ====      ========    =======    ========      =======
</TABLE>
 
   The accompanying notes are an integral part of these financial statements
                                       F-7
<PAGE>   121
 
                         NORTEK, INC. AND SUBSIDIARIES
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
 
1.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
     The Company is a diversified manufacturer of residential and commercial
building products, operating within four principal product groups: the
Residential Building Products Group; the Air Conditioning and Heating Products
Group; the Windows, Doors and Siding Group and the Specialty Products and
Distribution Group. Through these product groups, the Company manufactures and
sells, primarily in the United States, Canada and Europe, a wide variety of
products for the residential and commercial construction, manufactured housing,
and the do-it-yourself and professional remodeling and renovation markets.
 
PRINCIPLES OF CONSOLIDATION
 
     The consolidated financial statements include the accounts of Nortek, Inc.
and all of its significant wholly-owned subsidiaries (the "Company" or "Nortek")
after elimination of intercompany accounts and transactions. Certain amounts in
the prior years' financial statements have been reclassified to conform to the
presentation at December 31, 1997.
 
USE OF ESTIMATES
 
     The preparation of financial statements in conformity with generally
accepted accounting principles involves estimates and assumptions that affect
the reported amounts of assets and liabilities and disclosure of contingent
assets and liabilities as of the date of the financial statements and the
reported amounts of income and expense during the reporting periods. Actual
results could vary from the amounts derived from such estimates and assumptions.
 
CASH, INVESTMENTS AND MARKETABLE SECURITIES
 
     Cash equivalents consist of short-term highly liquid investments with
original maturities of three months or less which are readily convertible into
cash.
 
     The Company has classified as restricted (in current assets in the
accompanying consolidated balance sheet) certain investments and marketable
securities that are not fully available for use in its operations. At December
31, 1997, approximately $6,348,000 of cash, investments and marketable
securities has been pledged as collateral for insurance and other requirements.
 
DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS
 
     The following methods and assumptions were used to estimate the fair value
of each class of financial instruments for which it is practicable to estimate
that value:
 
  Cash and Cash Equivalents --
 
     The carrying amount approximates fair value because of the short maturity
of those instruments.
 
  Marketable Securities --
 
     The fair value of marketable securities is based on quoted market prices.
At December 31, 1997, the fair value of marketable securities approximated the
amount on the Company's consolidated balance sheet.
 
  Long-Term Debt --
 
     At December 31, 1997, the fair value of long-term indebtedness was
approximately $14,000,000 higher than the amount, before original issue
discount, on the Company's consolidated balance sheet. (See Note 5.)
 
INVENTORIES
 
     Inventories in the accompanying consolidated balance sheet are valued at
the lower of cost or market. At December 31, 1996 and 1997, approximately
$53,933,000 and $53,817,000 of total inventories, respectively, were valued on
the last-in, first-out method (LIFO). Under the first-in, first-out method
(FIFO) of accounting, such inventories would have been approximately $6,015,000
and $5,041,000 greater at December 31, 1996 and 1997, respectively. All other
inventories were valued under the FIFO method.
 
                                       F-8
<PAGE>   122
                         NORTEK, INC. AND SUBSIDIARIES
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
SALES RECOGNITION
 
     The Company recognizes sales upon the shipment of its products net of
applicable provisions for discounts and allowances. The Company also provides
for its estimate of warranty and bad debts at the time of sale as selling,
general and administrative expense.
 
FOREIGN CURRENCY TRANSLATION
 
     The financial statements of subsidiaries outside the United States are
generally measured using the local currency as the functional currency. The
Company translates the assets and liabilities of its foreign subsidiaries at the
exchange rates in effect at year-end. Net sales and expenses are translated
using average exchange rates in effect during the year. Gains and losses from
foreign currency translation are credited or charged to cumulative translation
adjustment included in stockholders' investment in the accompanying consolidated
balance sheet. Transaction gains or losses are recorded in selling, general and
administrative expense and have not been material.
 
DEPRECIATION AND AMORTIZATION
 
     Depreciation and amortization of property and equipment are provided on a
straight-line basis over the estimated useful lives, which are generally as
follows:
 
<TABLE>
<S>                                                          <C>
Buildings and improvements...............................      10-35 years
Machinery and equipment, including leases................       3-15 years
Leasehold improvements...................................    term of lease
</TABLE>
 
     Expenditures for maintenance and repairs are expensed when incurred.
Expenditures for renewals and betterments are capitalized. When assets are sold,
or otherwise disposed, the cost and accumulated depreciation are eliminated and
the resulting gain or loss is recognized.
 
GOODWILL
 
     The Company has classified as goodwill the cost in excess of fair value of
the net assets (including tax attributes) of companies acquired in purchase
transactions. Goodwill is being amortized on a straight-line method over 40
years. Amortization charged to operations amounted to $2,458,000, $2,904,000 and
$5,319,000 for 1995, 1996 and 1997, respectively. At each balance sheet date,
the Company evaluates the realizability of goodwill based on expectations of
non-discounted future cash flows for each subsidiary having a material goodwill
balance. If the sum of the expected non-discounted future cash flows is less
than the carrying amount of goodwill, the Company would recognize an impairment
loss. Based on its most recent analysis, the Company believes that no material
impairment of goodwill exists at December 31, 1997.
 
EARNINGS PER SHARE
 
     In 1997, the Company adopted the provisions of SFAS No. 128, Earnings Per
Share. This statement, which was issued by the FASB in February 1997,
establishes standards for computing and presenting earnings per share (EPS) and
applies to entities with publicly held common stock or potential common stock.
This statement replaces the presentation of primary EPS with a presentation of
basic EPS. It requires dual presentation of basic and diluted EPS on the face of
the statement of operations for all entities with complex capital structures and
requires a reconciliation of the numerators and denominators of the basic and
diluted EPS computations. This statement also requires a restatement of all
prior-period EPS data presented.
 
     Basic earnings per share amounts have been computed using the weighted
average number of common and common equivalent shares outstanding during each
year. Special Common Stock is treated as the equivalent of Common Stock in
determining earnings per share results. Diluted earnings per share amounts have
been computed using the weighted average number of common and common equivalent
shares and the dilutive potential common shares outstanding during each year.
 
                                       F-9
<PAGE>   123
                         NORTEK, INC. AND SUBSIDIARIES
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
     A reconciliation between basic and diluted earnings per share is as
follows:
 
<TABLE>
<CAPTION>
                                                                                 NINE MONTHS ENDED
                                        FOR THE YEARS ENDED DECEMBER 31,    ---------------------------
                                        --------------------------------    SEPTEMBER 27,    OCTOBER 3,
                                          1995        1996        1997          1997            1998
                                        --------    --------    --------    -------------    ----------
                                                                                    (UNAUDITED)
                                                    (IN THOUSANDS EXCEPT PER SHARE AMOUNTS)
<S>                                     <C>         <C>         <C>         <C>              <C>
Earnings from continuing operations...  $17,500     $23,700     $26,400        $20,800        $23,100
Basic EPS:
     Basic common shares..............   12,445      10,485       9,605          9,632         10,660
                                        =======     =======     =======        =======        =======
     Basic EPS........................  $  1.41     $  2.26     $  2.75        $  2.16        $  2.17
                                        =======     =======     =======        =======        =======
Diluted EPS:
     Basic common shares..............   12,445      10,485       9,605          9,632         10,660
     Plus: Impact of stock options
       (Note 6).......................      124         156         250            246            198
                                        -------     -------     -------        -------        -------
     Diluted common shares............   12,569      10,641       9,855          9,878         10,858
                                        =======     =======     =======        =======        =======
     Diluted EPS......................  $  1.39     $  2.23     $  2.68        $  2.11        $  2.13
                                        =======     =======     =======        =======        =======
</TABLE>
 
COMPREHENSIVE INCOME
 
     In June 1997, the FASB issued SFAS No. 130, Reporting Comprehensive Income
which will be effective for the Company's financial statements issued for the
fiscal year ending December 31, 1998. This statement establishes standards for
reporting and display of comprehensive income and its components (revenues,
expenses, gains and losses). Components of comprehensive income are net earnings
and all other changes that are currently reflected in Stockholders' Investment.
This statement requires that an enterprise (a) classify items of other
comprehensive income by their nature in a financial statement and (b) display
the accumulated balance of other comprehensive income separately from retained
earnings and additional paid-in capital in the equity section of a statement of
financial position.
 
SEGMENT INFORMATION
 
     In June 1997, the FASB issued SFAS No. 131, Disclosures About Segments of
an Enterprise and Related Information, which will be effective for the Company's
financial statements for the fiscal year ending December 31, 1998. This
statement establishes standards for reporting information about segments in
annual and interim financial statements. This statement introduces a new model
for segment reporting, called the "management approach." The management approach
is based on the way the chief operating decision-maker organizes segments within
a Company for making operating decisions and assessing performance. Reportable
segments are based on products and services, geography, legal structure and
management structure.
 
2.  ACQUISITIONS AND BUSINESSES SOLD
 
     Acquisitions are accounted for as purchases and, accordingly, have been
included in the Company's consolidated results of operations since the
acquisition date. Purchase price allocations are subject to refinement until all
pertinent information regarding the acquisitions is obtained.
 
     On August 26, 1997, a wholly owned subsidiary of the Company completed the
acquisition of Ply Gem Industries, Inc. ("Ply Gem") in a tender offer for a cash
price of $19.50 per outstanding share of common stock. The aggregate purchase
price of approximately $407.4 million consisted of $322.7 million of cash paid
to purchase the common stock and to settle stock options of Ply Gem, $50.5
million of cash paid to refinance existing indebtedness of Ply Gem (including
the repurchase of $45 million of accounts receivable under Ply Gem's
securitization program), $23.5 million of cash paid to certain officers of Ply
Gem in connection with termination agreements and $10.7 of cash paid for
expenses of the acquisition. Prior to accepting for payment
 
                                      F-10
<PAGE>   124
                         NORTEK, INC. AND SUBSIDIARIES
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
the tendered shares of Ply Gem on August 26, 1997, the Company sold $310,000,000
principal amount of 9 1/8% Senior Notes due September, 2007 (the "9 1/8% Notes")
at a slight discount (see Note 5). The Company used a portion of these net
proceeds, together with available cash, to purchase the shares of Ply Gem, fund
an approximate $45,000,000 payment to terminate Ply Gem's existing accounts
receivable securitization program and pay certain fees and expenses. The Company
has accounted for Ply Gem's subsidiary, Studley Products, Inc. (Studley) as an
operation held for sale since the date of the Ply Gem acquisition. Studley's
loss from continuing operations before income taxes excluded from the Company's
consolidated results of operations from the acquisition date to December 31,
1997 was approximately $2,900,000.
 
     Since the acquisition date, the Company has realized, and expects to
continue to realize, cost savings as a result of the acquisition. These savings
result from several actions, including: (i) the elimination of expenses
associated with Ply Gem's New York headquarters; (ii) the consolidation into
Nortek of certain of Ply Gem's corporate functions such as accounting, legal and
risk management; and (iii) the identification and rationalization of
under-performing product lines. Pro Forma earnings (see below) have been
adjusted for the pro forma effect of those estimated cost reductions directly
attributable to the acquisition. These expected pre-tax savings total
approximately $4,000,000 for the period from January 1, 1997 to the date of
acquisition for the year ended December 31, 1997 and approximately $7,800,000
for the year ended December 31, 1996. Pro Forma earnings (see below) do not
include additional estimated cost savings and operating efficiencies which
management expects will result from the acquisition. These additional estimated
pre-tax cost savings total approximately $14,100,000 and approximately
$13,500,000 for the periods January 1, 1997 to the date of acquisition for the
year ended December 31, 1997 and the year ended December 31, 1996, respectively.
The actual cost savings achieved since the acquisition of Ply Gem are reflected
in the Company's historical consolidated operating results for the period from
the acquisition date to December 31, 1997.
 
   
     The following presents the approximate unaudited Pro Forma net sales,
operating earnings, earnings from continuing operations and diluted earnings per
share of the Company for all periods presented and gives pro forma effect to the
acquisition of Ply Gem, the sale of $310,000,000 principal amount of 9 1/8%
Notes, the extension of credit under the Ply Gem credit facility to refinance
certain existing indebtedness and the termination of Ply Gem's accounts
receivable securitization program, the sale of $175,000,000 principal amount of
9 1/4% Notes, the refinancing of certain subsidiary indebtedness, and reflects
the estimated cost reductions directly attributable to the acquisition as
described above as if such transactions and adjustments had occurred on January
1, 1996 to the date of acquisition. The Pro Forma results below include the
actual results of Ply Gem since August 26, 1997 in accordance with the purchase
method of accounting for an acquisition.
    
 
   
<TABLE>
<CAPTION>
                                                               FOR THE YEARS ENDED
                                                                   DECEMBER 31,
                                                           ----------------------------
                                                              1996              1997
                                                           ----------        ----------
                                                               (IN THOUSANDS EXCEPT
                                                                PER SHARE AMOUNTS)
                                                                   (UNAUDITED)
<S>                                                        <C>               <C>
PRO FORMA
Net sales................................................  $1,616,485        $1,650,052
Operating earnings.......................................      94,400            87,300
Earnings from continuing operations......................       7,700             8,200
Diluted earnings from continuing operations per share....  $      .72        $      .68
</TABLE>
    
 
     In computing the pro forma earnings, earnings have been reduced by the net
interest income on the aggregate cash portion of the purchase price of the
acquisition at the historical rate earned by the Company and interest expense on
indebtedness incurred in connection with the acquisition, the refinancing and
repayment of certain indebtedness of Ply Gem. Earnings have been reduced by
amortization of goodwill and reflect net adjustments to depreciation expense as
a result of an increase in the estimated fair market value of
 
                                      F-11
<PAGE>   125
                         NORTEK, INC. AND SUBSIDIARIES
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
property and equipment and changes in depreciable lives. Interest expense on the
subsidiary indebtedness refinanced with funds from the 9 1/4% Notes offering was
excluded at an average interest rate consistent with the indebtedness
outstanding which was refinanced for all periods presented, net of the tax
effect. Interest expense was included on the 9 1/4% Notes at a rate of
approximately 9 1/4%, plus amortization of deferred debt expense and debt
discount net of tax effect, and on the 9 1/8% Notes at a rate of approximately
9 1/8%, plus amortization of deferred debt expense and debt discount for the
periods presented, net of tax effect.
 
     The pro forma information presented does not purport to be indicative of
the results which would have been reported if these transactions had occurred on
January 1, 1996, or which may be reported in the future.
 
     In the fourth quarter of 1995, several of the Company's wholly owned
subsidiaries completed the acquisition of the assets, subject to certain
liabilities, of Rangaire Company ("Rangaire"), all the capital stock of Best
S.p.A. and related entities ("Best") and all the capital stock of Venmar
Ventilation inc. ("Venmar"). The aggregate purchase price for these acquisitions
was approximately $36,500,000, consisting of cash of approximately $33,400,000
and future payments of approximately $3,100,000. The selling shareholders of
certain of these acquisitions are entitled to additional purchase price payments
of up to approximately $2,000,000, depending on subsequent operating results of
such acquisitions.
 
3.  CASH FLOWS
 
     Interest paid was $23,203,000, $30,568,000 and $35,921,000 in 1995, 1996
and 1997, respectively.
 
     Fair value of assets acquired was $129,652,000 and $672,311,000 in 1995 and
1997, respectively. Liabilities assumed or created of businesses acquired was
$96,224,000 and $264,892,000 in 1995 and 1997, respectively. Cash paid for
acquisitions net of cash acquired was $27,543,000 and $407,419,000 in 1995 and
1997, respectively.
 
     Cash proceeds from businesses sold totaled $1,129,000 in 1995 and included
$2,874,000 of proceeds from the sale of preferred stock net of $1,745,000 for
payments made in relation to businesses sold.
 
     Significant non-cash financing and investing activities excluded from the
accompanying consolidated statement of cash flows include capitalized lease
additions of approximately $500,000 in 1996 and approximately $800,000 in 1995
and an increase of approximately $2,969,000, a decline of approximately $481,000
and an increase of approximately $781,000 in the fair market value of marketable
securities available for sale for 1995, 1996 and 1997, respectively.
 
4.  INCOME TAXES
 
     The following is a summary of the components of earnings from continuing
operations before provision for income taxes:
 
<TABLE>
<CAPTION>
                                                        FOR THE YEARS ENDED DECEMBER 31,
                                                        --------------------------------
                                                          1995        1996        1997
                                                        --------    --------    --------
                                                             (AMOUNTS IN THOUSANDS)
<S>                                                     <C>         <C>         <C>
Domestic..............................................  $25,400     $35,100     $37,000
Foreign...............................................    2,700       3,500       5,700
                                                        -------     -------     -------
                                                        $28,100     $38,600     $42,700
                                                        =======     =======     =======
</TABLE>
 
                                      F-12
<PAGE>   126
                         NORTEK, INC. AND SUBSIDIARIES
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
     The following is a summary of the provision (benefit) for income taxes from
continuing operations included in the accompanying consolidated statement of
operations:
 
<TABLE>
<CAPTION>
                                                        FOR THE YEARS ENDED DECEMBER 31,
                                                        --------------------------------
                                                          1995        1996        1997
                                                        --------    --------    --------
                                                             (AMOUNTS IN THOUSANDS)
<S>                                                     <C>         <C>         <C>
Federal income taxes --
     Current..........................................  $ 7,100     $15,050     $ 9,000
     Deferred.........................................    1,200      (3,000)      4,000
                                                        -------     -------     -------
                                                          8,300      12,050      13,000
     Foreign..........................................    1,300       1,300       1,000
     State............................................    1,000       1,550       2,300
                                                        -------     -------     -------
                                                        $10,600     $14,900     $16,300
                                                        =======     =======     =======
</TABLE>
 
     Income tax payments, net of refunds, were approximately $3,739,000,
$18,611,000 and $7,977,000 in 1995, 1996 and 1997, respectively.
 
     The following reconciles the federal statutory income tax rate of
continuing operations to the effective tax rate of such earnings of
approximately 37.7%, 38.6% and 38.2% in 1995, 1996 and 1997, respectively.
 
<TABLE>
<CAPTION>
                                                        FOR THE YEARS ENDED DECEMBER 31,
                                                        --------------------------------
                                                          1995        1996        1997
                                                        --------    --------    --------
                                                             (AMOUNTS IN THOUSANDS)
<S>                                                     <C>         <C>         <C>
Income tax provision from continuing operations at
  the Federal statutory rate........................    $ 9,835     $13,510     $14,945
Net change from statutory rate:
     Change in tax reserves, net....................     (1,100)       (481)     (1,540)
     State income taxes, net of federal tax
       effect.......................................        650       1,008       1,520
     Amortization not deductible for income tax
       purposes.....................................        868       1,040       1,827
     Product development income tax credit from
       foreign operations...........................         --        (478)       (264)
     Tax effect on foreign income...................         79          56         (86)
     Effect of change in foreign tax law............         --          --        (766)
     Other, net.....................................        268         245         664
                                                        -------     -------     -------
                                                        $10,600     $14,900     $16,300
                                                        =======     =======     =======
</TABLE>
 
     The tax effect of temporary differences which gave rise to significant
portions of deferred income tax assets and liabilities as of December 31, 1996
and December 31, 1997 are as follows:
 
<TABLE>
<CAPTION>
                                                                   DECEMBER 31,
                                                              -----------------------
                                                                1996          1997
                                                              --------      ---------
                                                              (AMOUNTS IN THOUSANDS)
<S>                                                           <C>           <C>
PREPAID INCOME TAX ASSETS ARISING FROM:
     Net operating losses of Ply Gem........................  $    --       $  6,000
     Accounts receivable....................................    1,246          4,038
     Inventory..............................................     (610)         7,201
     Insurance reserves.....................................    4,985          9,624
     Other reserves, liabilities and assets, net............   14,379         19,937
                                                              -------       --------
                                                              $20,000       $ 46,800
                                                              =======       ========
</TABLE>
 
                                      F-13
<PAGE>   127
                         NORTEK, INC. AND SUBSIDIARIES
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
<TABLE>
<CAPTION>
                                                                   DECEMBER 31,
                                                              -----------------------
                                                                1996          1997
                                                              --------      ---------
                                                              (AMOUNTS IN THOUSANDS)
<S>                                                           <C>           <C>
DEFERRED (PREPAID) INCOME TAX (ASSETS) LIABILITIES ARISING
  FROM:
     Property and equipment, net............................  $15,400       $ 30,032
     Other reserves, liabilities and (assets), net..........     (608)       (19,547)
     Capital loss carryforward..............................   (6,462)          (655)
     Net operating losses of Ply Gem........................       --        (21,580)
     Valuation allowances...................................   10,238          7,771
     Other tax assets.......................................     (931)        (6,043)
                                                              -------       --------
                                                              $17,637       $(10,022)
                                                              =======       ========
</TABLE>
 
     At December 31, 1997, the Company had approximately $60,800,000 of net U.S.
federal prepaid income tax assets which are expected to be realized through
future operating earnings. At December 31, 1997, the Company's wholly owned
subsidiary, Ply Gem, had a net operating loss carry-forward of approximately
$78,800,000 that expires in 2011 and is subject to certain limitations imposed
by the Internal Revenue Code. These losses may only be utilized against future
income of the Ply Gem Group and the utilization of these losses is limited to
approximately $17,500,000 per year.
 
5.  NOTES, MORTGAGE NOTES AND OBLIGATIONS PAYABLE
 
     Short-term bank obligations at December 31, 1996 and 1997 consist of the
following:
 
<TABLE>
<CAPTION>
                                                                   DECEMBER 31,
                                                              ----------------------
                                                                1996          1997
                                                              --------      --------
                                                              (AMOUNTS IN THOUSANDS)
<S>                                                           <C>           <C>
Secured revolving lines of credit of a Canadian
  subsidiary................................................  $ 2,472       $    --
Secured lines of credit and bank advances of the Company's
  European subsidiaries.....................................   22,118        11,318
Other obligations...........................................      744           452
                                                              -------       -------
Short-term Bank Obligations.................................  $25,334       $11,770
                                                              =======       =======
</TABLE>
 
     These short term bank obligations are secured by approximately $29,600,000
of accounts receivable and inventory. These borrowings have an average weighted
interest rate of approximately 9.475%.
 
     Notes, mortgage notes and obligations payable in the accompanying
consolidated balance sheet at December 31, 1996 and 1997 consist of the
following:
 
<TABLE>
<CAPTION>
                                                                   DECEMBER 31,
                                                              ----------------------
                                                                1996          1997
                                                              --------      --------
                                                              (AMOUNTS IN THOUSANDS)
<S>                                                           <C>           <C>
9 1/4% Senior Notes due 2007 ("9 1/4 Notes"), net of
  unamortized original issue discount of $961,000...........  $     --      $174,039
9 1/8% Senior Notes due 2007 ("9 1/8% Notes"), net of
  unamortized original issue discount of $2,451,000.........        --       307,549
9 7/8% Senior Subordinated Notes due 2004 ("9 7/8% Notes"),
  net of unamortized original issue discount of $1,396,000
  and $1,259,000............................................   217,104       217,241
Ply Gem term loan...........................................        --       103,940
Mortgage notes payable......................................    20,878        16,882
Other.......................................................    16,939        22,158
                                                              --------      --------
                                                               254,921       841,809
Less amounts included in current liabilities................    11,152         5,969
                                                              --------      --------
                                                              $243,769      $835,840
                                                              ========      ========
</TABLE>
 
                                      F-14
<PAGE>   128
                         NORTEK, INC. AND SUBSIDIARIES
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
     On March 17, 1997, the Company sold $175,000,000 of its 9 1/4% Senior Notes
due March 15, 2007 ("9 1/4% Notes") at a discount of approximately $1,011,500,
which is being amortized over the life of the issue. Net proceeds from the sale
of the 9 1/4% Notes, after deducting underwriting commissions and expenses,
amounted to approximately $168,945,000, a portion of which was used to refinance
certain outstanding indebtedness of the Company's subsidiaries. The 9 1/4% Notes
are redeemable at the option of the Company, in whole or in part, at any time
and from time to time, on or after March 15, 2002 at 104.625%, declining to 100%
on March 15, 2005 and thereafter. On August 26, 1997, the Company sold
$310,000,000 of its 9 1/8% Senior Notes due September 1, 2007 ("9 1/8% Notes")
at a discount of approximately $2,505,000, which is being amortized over the
life of the issue. Net proceeds from the sale of the 9 1/8% Notes, after
deducting underwriting commissions and expenses, amounted to approximately
$297,269,000. The 9 1/8% Notes are redeemable at the option of the Company, in
whole or in part, at any time and from time to time, on or after September 1,
2002 at 104.563%, declining to 100% on September 1, 2005 and thereafter. The
Company used a portion of these net proceeds, together with available cash, to
purchase the shares of Ply Gem. (See Note 2.)
 
     The indenture governing the 9 7/8% Notes, the Company's most restrictive
indenture, restricts, among other things, the payment of cash dividends,
repurchase of the Company's capital stock and the making of certain other
restricted payments, the incurrence of additional indebtedness, the making of
certain investments, mergers, consolidations and sale of assets (all as defined
in the indenture). Upon certain asset sales (as defined in the indenture), the
Company will be required to offer to purchase, at 100% principal amount plus
accrued interest to the date of purchase, 9 7/8% Notes in a principal amount
equal to any net cash proceeds (as defined in the indenture) that are not
invested in properties and assets used primarily in the same or related business
to those owned and operated by the Company at the issue date of the 9 7/8% Notes
or at the date of such asset sale and such net cash proceeds were not applied to
permanently reduce Senior Indebtedness (as defined in the indenture). The 9 7/8%
Notes are redeemable at the option of the Company, in whole or in part, at any
time and from time to time, at 104.214% on March 1, 1999, declining to 100% on
March 1, 2002 and thereafter. At March 1, 1998 approximately $6,872,000 was
available for the payment of cash dividends or stock payments under the terms of
the Company's Indenture governing the 9 7/8% Notes. (See Note 6.)
 
     The Company's Ply Gem subsidiary has a credit facility with a syndicate of
banks, which provides Ply Gem with a term loan and a letter of credit facility.
Interest on borrowings is at varying rates based, at Ply Gem's option, on (a)
the London Interbank Offered Rate (LIBOR) plus a spread or (b) the higher of (i)
 .5% above the federal funds rate or (ii) the bank's prime rate. Ply Gem pays a
facility fee quarterly which fluctuates between .20% and .30% of the aggregate
principal amount available under the facility. The average weighted interest
rate on the credit facility for the period from inception (August 26, 1997) to
December 31, 1997 was 6.75%. The credit facility includes customary covenants,
including covenants limiting Ply Gem's ability to pledge assets or incur liens
on assets and maintain certain financial covenants. Borrowings under this credit
facility are collateralized by the common stock, inventory and accounts
receivable of Ply Gem's principal subsidiaries.
 
     The Company's Ply Gem subsidiary has $75 million of interest rate swap
agreements, whereby Ply Gem will pay the counterparties interest at a fixed rate
of 5.53% and the counterparties will pay the Company interest at a floating rate
equal to one month LIBOR for a two year period ending December 3, 1998. At the
option of the counterparties, the termination date may be extended to December
3, 1999 upon notice to Ply Gem. Amounts to be paid or received under interest
rate swap agreements are accrued as interest rates change and are recognized
over the life of the swap agreements as an adjustment to interest expense. The
Company's Ply Gem subsidiary also has $75 million of interest rate cap
agreements which entitles Ply Gem to receive from the counterparties on a
monthly basis an amount by which the LIBOR interest rate on $75 million of its
floating rate debt exceeds 7% during the period December 5, 1998 to December 5,
1999. The cost of interest rate cap agreements are amortized to interest expense
over the life of the cap. Payments received as a result of the cap agreements
reduce interest expense. The unamortized costs of the cap agreements are
included in
 
                                      F-15
<PAGE>   129
                         NORTEK, INC. AND SUBSIDIARIES
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
other assets. The impact of these arrangements has not been material to the
Company's consolidated operating results.
 
     Mortgage notes payable of approximately $16,882,000 outstanding at December
31, 1997 include various mortgage notes and other related indebtedness payable
in installments through 2012 and bearing interest at rates ranging from 3.875%
to 9.3% and are collateralized by property and equipment with an aggregate net
book value of approximately $36,700,000 at December 31, 1997.
 
     Other obligations of approximately $22,158,000 outstanding at December 31,
1997 include borrowings relating to equipment purchases and other borrowings
bearing interest at rates primarily ranging between 3.5% to 13.0% and maturing
at various dates through 2017. Approximately $18,400,000 of such indebtedness is
collateralized by property and equipment with an aggregate net book value of
approximately $21,400,000 at December 31, 1997.
 
     The following is a summary of maturities of all of the Company's debt
obligations at December 31, 1997, excluding unamortized debt discount, due after
December 31, 1997:
 
<TABLE>
<CAPTION>
                                                          (AMOUNTS IN THOUSANDS)
                                                          ----------------------
<S>                                                       <C>
1999....................................................         $  8,923
2000....................................................            9,315
2001....................................................            9,512
2002....................................................           92,755
Thereafter..............................................          720,006
                                                                 --------
                                                                 $840,511
                                                                 ========
</TABLE>
 
6.  COMMON STOCK, SPECIAL COMMON STOCK, STOCK OPTIONS AND DEFERRED COMPENSATION
 
     Each share of Special Common Stock has 10 votes on all matters submitted to
a stockholder vote, except that the holders of Common Stock, voting separately
as a class, have the right to elect 25% of the directors to be elected at a
meeting, with the remaining 75% being elected by the combined vote of both
classes. Shares of Special Common Stock are generally non-transferable, but are
freely convertible on a share-for-share basis into shares of Common Stock.
 
     On April 1, 1996, the Company extended and amended its shareholder rights
plan to March 31, 2006. Under the amended plan, each right previously issued
under the plan in effect to date, or subsequently issued under the amended and
restated plan, entitles shareholders to buy 1/100 of a share of a new series of
preference stock of Nortek at an exercise price of $72 per share, subject to
adjustments for stock dividends, splits and similar events.
 
     The rights, that are not currently exercisable, are attached to each share
of Common Stock and may be redeemed by the Directors at $.01 per share at any
time. After a shareholder acquires beneficial ownership of 17% or more of the
Company's Common Stock and Special Common Stock, the rights will trade
separately and become exercisable entitling a rights holder to acquire
additional shares of the Company's Common Stock having a market value equal to
twice the amount of the exercise price of the right. In addition, after a person
or group ("Acquiring Company") commences a tender offer or announces an
intention to acquire 30% or more of the Company's Common Stock and Special
Common Stock, the rights will trade separately and, under certain circumstances,
will permit each rights holder to acquire common stock of the Acquiring Company,
having a market value equal to twice the amount of the exercise price of the
right.
 
                                      F-16
<PAGE>   130
                         NORTEK, INC. AND SUBSIDIARIES
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
     At December 31, 1997, a total of 1,804,134 shares of Common Stock was
reserved as follows:
 
<TABLE>
<S>                                                           <C>
Stock option plans..........................................  1,036,847
Conversion of Special Common Stock..........................    767,287
                                                              ---------
                                                              1,804,134
                                                              =========
</TABLE>
 
     At December 31, 1997, 755,000 shares of Special Common Stock were reserved
for stock option plans.
 
     The Company has several stock option plans which provide for the granting
of options to certain officers, employees and non-employee directors of the
Company. Options granted under the plans vest over periods ranging up to five
years and expire ten years from the date of grant. At December 31, 1997, 51,067
additional options are available for grant under these plans. Options for 27,500
and 427,915 shares of Common and Special Common Stock became exercisable during
1996 and 1997, respectively.
 
     The following summarizes the Common and Special Common Stock option
transactions for the three years ended December 31, 1997:
 
<TABLE>
<CAPTION>
                                                                                 WEIGHTED
                                                                                 AVERAGE
                                                    NUMBER       OPTION PRICE    EXERCISE
                                                   OF SHARES       PER SHARE      PRICE
                                                   ---------    ---------------  --------
<S>                                                <C>          <C>              <C>
Options outstanding at December 31, 1994.........   494,100     $ 2.25--$ 15.69   $ 6.97
     Exercised...................................   (42,600)      2.25--  2.875     2.81
                                                    -------     ---------------   ------
Options outstanding at December 31, 1995.........   451,500     $ 2.25--$ 15.69   $ 7.36
     Granted.....................................   275,000               14.75    14.75
     Exercised...................................   (95,200)      2.25--$7.9375     5.07
     Canceled....................................    (2,500)               8.75     8.75
                                                    -------     ---------------   ------
Options outstanding at December 31, 1996.........   628,800     $2.875--  15.69   $10.93
     Granted.....................................   435,600       19.5--  27.00    22.98
     Exercised...................................   (71,953)     2.875--  15.69     6.66
     Canceled....................................    (6,667)              22.69    22.69
                                                    -------     ---------------   ------
Options outstanding at December 31, 1997.........   985,780     $2.875--  27.00   $16.48
                                                    =======     ===============   ======
</TABLE>
 
     22,100 of the 985,780 options outstanding at December 31, 1997 have an
exercise price of $2.875, with a weighted average contractual life of 2.8 years.
All of these options are exercisable. 259,747 options have exercise prices
between $7.69 and $9.38 with a weighted average exercise price of $8.75 and a
weighted average remaining contractual life of 6.0 years. All of these options
are exercisable. 275,000 options, all of which are exercisable, have an exercise
price of $14.75 and a remaining contractual life of 9.0 years. The remaining
428,933 options, 152,915 of which are exercisable, have exercise prices between
$19.50 and $27.00, with a weighted average exercise price of $22.976 and a
remaining contractual life of 10 years.
 
     The Company accounts for stock option plans under APB Opinion No. 25, under
which no compensation cost has been recognized since options are granted with
exercise prices equal to the fair market value of the Common Stock at the date
of grant. Had compensation cost for these plans been determined consistent with
SFAS No. 123, the Company's earnings from continuing operations and diluted
earnings per share from continuing operations would have been approximately
$23,300,000 and $2.19 for 1996 and approximately $24,100,000 and $2.45 for 1997,
respectively, and net earnings and diluted net earnings per share would have
been approximately $21,600,000 and $2.03 for 1996 and approximately $19,000,000
and $1.92 for 1997, respectively.
 
                                      F-17
<PAGE>   131
                         NORTEK, INC. AND SUBSIDIARIES
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
     The weighted average grant date fair value of options granted was $6.15 and
$9.82 in 1996 and 1997, respectively. The fair value of each option grant is
estimated on the date of the grant using the Black-Scholes option pricing model
with the following assumptions used:
 
<TABLE>
<CAPTION>
                                              1996             1997
                                              ----    -----------------------
<S>                                          <C>      <C>
Risk-free interest rate....................       7%  Between 5.75% and 6.73%
Expected life..............................  5 years          5 years
Expected volatility........................      33%            37%
Expected dividend yield....................       0%            0%
</TABLE>
 
     The Company's Board of Directors has authorized a program to purchase up to
500,000 shares of the Company's Common and Special Common Stock in open market
or negotiated transactions, subject to market conditions, cash availability and
provisions of the Company's outstanding debt instruments. As of February 28,
1998, the Company has purchased approximately 316,500 shares of its Common and
Special Common Stock for approximately $9,314,000 under this program and
accounted for such share purchases as treasury stock.
 
7.  PENSION, RETIREMENT AND PROFIT SHARING PLANS
 
     The Company and its subsidiaries have various pension, retirement and
profit sharing plans requiring contributions to qualified trusts and union
administered funds. Pension and profit sharing expense charged to operations
aggregated approximately $828,000 in 1995, approximately $4,310,000 in 1996 and
approximately $6,624,000 in 1997. The Company's policy is to fund currently the
actuarially determined annual contribution. In the fourth quarter of 1995,
benefits related to the Company's existing defined benefit plans were frozen. On
January 1, 1996, the Company adopted a supplemental retirement plan for certain
officers. The actuarial present value of the unfunded accumulated benefit
obligation and the pension costs of this plan have been included in the tables
below.
 
     The Company's net expense for its defined benefit plans for 1995, 1996 and
1997 consists of the following components:
 
<TABLE>
<CAPTION>
                                                     YEARS ENDED DECEMBER 31,
                                                    ---------------------------
                                                     1995      1996      1997
                                                    -------   -------   -------
                                                      (AMOUNTS IN THOUSANDS)
<S>                                                 <C>       <C>       <C>
Service costs.....................................  $ 1,156   $   358   $   485
Interest cost.....................................    2,069     2,226     2,655
Actual net income on plan assets..................   (2,640)   (3,944)   (9,157)
Net amortization and deferred items...............      434     2,218     7,361
Net gain from freezing plan benefits..............     (581)       --        --
                                                    -------   -------   -------
          Total expense...........................  $   438   $   858   $ 1,344
                                                    =======   =======   =======
</TABLE>
 
                                      F-18
<PAGE>   132
                         NORTEK, INC. AND SUBSIDIARIES
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
     The following sets forth the funded status of the Company's defined benefit
plans and amounts recognized in the Company's consolidated balance sheet at
December 31, 1996 and 1997:
 
<TABLE>
<CAPTION>
                                                              PLAN ASSETS EXCEEDING
                                                               BENEFIT OBLIGATIONS
                                                              ----------------------
                                                                1996          1997
                                                              --------      --------
                                                              (AMOUNTS IN THOUSANDS)
<S>                                                           <C>           <C>
Actuarial present value of benefit obligations at September
  30:
     Vested benefits........................................  $23,945       $33,958
     Non-Vested benefits....................................       --           585
                                                              -------       -------
     Accumulated benefit obligation.........................   23,945        34,543
     Effect of projected future compensation levels.........       --         2,394
                                                              -------       -------
Projected benefit obligation................................   23,945        36,937
Plan assets at fair value at September 30...................   28,040        48,673
                                                              -------       -------
Plan assets in excess of the projected benefit obligation...    4,095        11,736
Unrecognized net gain.......................................     (452)       (6,026)
                                                              -------       -------
                                                              $ 3,643       $ 5,710
                                                              =======       =======
</TABLE>
 
<TABLE>
<CAPTION>
                                                               BENEFIT OBLIGATIONS
                                                              EXCEEDING PLAN ASSETS
                                                              ----------------------
                                                                1996          1997
                                                              --------      --------
                                                              (AMOUNTS IN THOUSANDS)
<S>                                                           <C>           <C>
Actuarial present value of benefit obligations at September
  30:
Vested benefits.............................................  $ 5,359       $11,027
Non-vested benefits.........................................      520           810
                                                              -------       -------
Accumulated benefit obligation..............................    5,879        11,837
Effect of projected future compensation levels..............    2,439         3,662
                                                              -------       -------
Projected benefit obligation................................    8,318        15,499
Plan assets at fair value at September 30...................      804         3,639
                                                              -------       -------
Projected benefit obligation in excess of plan assets.......   (7,514)      (11,860)
Unrecognized net loss.......................................      212         1,707
Unrecognized prior service costs............................    6,335         7,125
Additional minimum liability................................   (4,108)       (5,341)
                                                              -------       -------
                                                              $(5,075)      $(8,369)
                                                              =======       =======
</TABLE>
 
     Plan assets include commingled funds, marketable securities, insurance
contracts and cash and short-term investments. The weighted average discount
rate and rate of increase in future compensation levels used in determining the
actuarial present value of benefit obligations were 7 1/2 percent and 5 percent,
respectively, in 1995, 1996 and 1997. The expected long-term rate of return on
assets was 8 1/2 percent in 1995, 1996 and 1997.
 
     Recognition of a minimum pension liability and an intangible asset for
certain plans resulted in a cumulative reduction in the Company's stockholders'
investment of approximately $916,000, $1,043,000 and $124,000 in 1995, 1996, and
1997, respectively.
 
8.  COMMITMENTS AND CONTINGENCIES
 
     The Company provides accruals for all direct costs associated with the
estimated resolution of contingencies at the earliest date at which it is deemed
probable that a liability has been incurred and the amount of such liability can
be reasonably estimated.
 
                                      F-19
<PAGE>   133
                         NORTEK, INC. AND SUBSIDIARIES
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
     At December 31, 1997, the Company and its subsidiaries are obligated under
lease agreements for the rental of certain real estate and machinery and
equipment used in its operations. Minimum annual rental expense aggregates
approximately $110,427,000 at December 31, 1997. The obligations are payable as
follows:
 
<TABLE>
<S>                                                           <C>
1998........................................................  $18,203,000
1999........................................................   15,094,000
2000........................................................   11,250,000
2001........................................................    8,026,000
2002........................................................    6,933,000
Thereafter..................................................   50,921,000
</TABLE>
 
     Certain of these lease agreements provide for increased payments based on
changes in the consumer price index. Rental expense charged to operations in the
accompanying consolidated statement of operations was approximately $6,900,000,
$6,725,000, and $8,700,000, for the years ended December 31, 1995, 1996 and
1997, respectively. Under certain of these lease agreements, the Company and its
subsidiaries are also obligated to pay insurance and taxes.
 
     The Company is subject to other contingencies, including legal proceedings
and claims arising out of its businesses that cover a wide range of matters,
including, among others, environmental matters, contract and employment claims,
product liability, warranty and modification, adjustment or replacement of
component parts of units sold, which may include product recalls. The Company
has used various substances in its products and manufacturing operations which
have been or may be deemed to be hazardous or dangerous, and the extent of its
potential liability, if any, under environmental, product liability and workers'
compensation statutes, rules, regulations and case law is unclear. Further, due
to the lack of adequate information and the potential impact of present
regulations and any future regulations, there are certain circumstances in which
no range of potential exposure may be reasonably estimated.
 
     While it is impossible to ascertain the ultimate legal and financial
liability with respect to contingent liabilities, including lawsuits, the
Company believes that the aggregate amount of such liabilities, if any, in
excess of amounts provided, will not have a material adverse effect on the
consolidated financial position or results of operations of the Company.
 
9.  DISCONTINUED OPERATIONS
 
     In the fourth quarter of 1997, the Company adopted a plan of disposition
for its Plumbing Products Group. The following is a summary of the results of
discontinued operations for the three years ended December 31, 1997:
 
<TABLE>
<CAPTION>
                                                             YEARS ENDED DECEMBER 31,
                                                          ------------------------------
                                                            1995       1996       1997
                                                          --------   --------   --------
                                                              (AMOUNTS IN THOUSANDS)
<S>                                                       <C>        <C>        <C>
Net sales...............................................  $119,410   $128,241   $104,467
                                                          --------   --------   --------
Loss before income taxes................................  $ (3,800)  $ (2,600)  $ (5,700)
Income tax benefit......................................     1,300        900      2,100
                                                          --------   --------   --------
Loss from discontinued operations.......................    (2,500)    (1,700)    (3,600)
Reserve for future operating expenses, net of income tax
  benefit of $900,000...................................        --         --     (1,600)
                                                          --------   --------   --------
Loss from discontinued operations.......................  $ (2,500)  $ (1,700)  $ (5,200)
                                                          ========   ========   ========
</TABLE>
 
     Loss from discontinued operations before income taxes includes an
allocation of corporate interest expense of approximately $1,900,000, $1,700,000
and $1,900,000 in 1995, 1996 and 1997, respectively. Corporate interest was
allocated to discontinued operations based on the ratio of net assets of the
discontinued operation to the sum of the total consolidated net assets of the
Company plus consolidated debt of the
 
                                      F-20
<PAGE>   134
                         NORTEK, INC. AND SUBSIDIARIES
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
Company other than debt of the discontinued operation assumed by the buyer and
debt that is directly attributed to other operations of the Company.
 
10.  OPERATING AND GEOGRAPHIC SEGMENT INFORMATION AND CONCENTRATION OF CREDIT
RISK
 
     The Company operates in one industry segment, Residential and Commercial
Building Products. No single customer accounts for 10% or more of consolidated
net sales.
 
     The following information by geographic area is presented for 1996 and 1997
for the Company's continuing operations:
 
<TABLE>
<CAPTION>
                                                              PRE-TAX EARNINGS
                                                    NET       FROM CONTINUING    IDENTIFIABLE
     FOR THE YEAR ENDED DECEMBER 31, 1996:         SALES         OPERATIONS         ASSETS
     -------------------------------------       ----------   ----------------   ------------
                                                            (AMOUNTS IN THOUSANDS)
<S>                                              <C>          <C>                <C>
Geographic areas:
     Domestic operations.......................    $706,548       $66,514           $303,273
     European operations.......................      82,363         3,520             73,285
     Other foreign operations..................      67,503         4,886             64,609
     Eliminations..............................     (14,857)           --             (5,663)
                                                 ----------       -------         ----------
                                                    841,557        74,920            435,504
          Unallocated..........................          --       (13,969)           154,729
          Interest expense.....................          --       (28,400)
          Investment income....................          --         6,049                 --
                                                 ----------       -------         ----------
               Consolidated Totals.............    $841,557       $38,600           $590,233
                                                 ==========       =======         ==========
</TABLE>
 
<TABLE>
<CAPTION>
                                                              PRE-TAX EARNINGS
                                                    NET       FROM CONTINUING    IDENTIFIABLE
     FOR THE YEAR ENDED DECEMBER 31, 1997:         SALES         OPERATIONS         ASSETS
     -------------------------------------       ----------   ----------------   ------------
                                                            (AMOUNTS IN THOUSANDS)
<S>                                              <C>          <C>                <C>
Geographic areas:
     Domestic operations.......................  $  998,049       $86,491         $  976,891
     European operations.......................      76,564         3,467             60,743
     Other foreign operations..................      75,700         7,046             57,527
     Eliminations..............................     (16,184)           --             (7,986)
                                                 ----------       -------         ----------
                                                  1,134,129        97,004          1,087,175
          Unallocated..........................          --       (14,023)           217,371
          Interest expense.....................          --       (50,210)                --
          Investment income....................          --         9,929                 --
                                                 ----------       -------         ----------
               Consolidated Totals.............  $1,134,129       $42,700         $1,304,546
                                                 ==========       =======         ==========
</TABLE>
 
     Unallocated assets consist primarily of cash, investments and marketable
securities and U.S. Federal prepaid income taxes.
 
     The Company operates internationally and is exposed to market risks from
changes in foreign exchange rates. Financial instruments which potentially
subject the Company to concentrations of credit risk consist principally of
temporary cash investments and trade receivables. The Company places its
temporary cash investments with high credit quality financial institutions and
limits the amount of credit exposure to any one financial institution.
Concentrations of credit risk with respect to trade receivables are limited due
to the large number of customers comprising the Company's customer base and
their dispersion across many different geographical regions. At December 31,
1997, the Company had no significant concentrations of credit risk.
 
                                      F-21
<PAGE>   135
                         NORTEK, INC. AND SUBSIDIARIES

           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
11.  NET GAIN (LOSS) ON MARKETABLE SECURITIES
 
     At December 31, 1996 and 1997, the reduction in the Company's stockholders'
investment for gross unrealized losses was approximately $891,000 and $110,000,
respectively. At December 31, 1997, there were no gross unrealized gains on the
Company's marketable securities.
 
     The Company's unrestricted marketable securities at December 31, 1997
consist primarily of U.S. Government Treasury Notes, certificates of deposit,
and bank issued money market instruments of which approximately $26,006,000
mature within one year; approximately $5,978,000 mature within one to five years
and approximately $4,004,000 mature within five to ten years.
 
12.  ACCRUED EXPENSES AND TAXES, NET
 
     Accrued expenses and taxes, net, consist of the following at December 31,
1996 and 1997:
 
<TABLE>
<CAPTION>
                                                                   DECEMBER 31,
                                                              -----------------------
                                                                1996          1997
                                                              ---------    ----------
                                                              (AMOUNTS IN THOUSANDS)
<S>                                                           <C>          <C>
Insurance                                                      $12,205      $ 23,880
Payroll, management incentive and accrued employee benefits     23,136        37,600
Interest                                                         7,749        22,049
Accrued product warranty expense                                 7,770         9,471
Other, net                                                      37,392        71,001
                                                               -------      --------
                                                               $88,252      $164,001
                                                               =======      ========
</TABLE>
 
13.  SUBSEQUENT EVENTS
 
     On March 9, 1998, the Company through a wholly-owned subsidiary, entered
into an agreement to purchase NuTone, Inc., a wholly-owned subsidiary of
Williams plc, for approximately $242,500,000 in cash. The acquisition is subject
to the requirements of the Hart-Scott-Rodino Antitrust Improvements Act. In
connection with its review of the transaction under the Act, the Federal Trade
Commission ("FTC") has issued a "second request" for certain additional
information. The FTC has taken no position with respect to the transaction and
there can be no assurance that the transaction, as proposed, will be
consummated. If the acquisition is not consummated, the Company expects that it
would incur an approximately $3,000,000 ($0.31 per diluted share) net after tax
charge to its earnings as a result of fees, expenses and other acquisition
related costs. See Note 15(E).
 
                                      F-22
<PAGE>   136
                         NORTEK, INC. AND SUBSIDIARIES
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
14.  SUMMARIZED QUARTERLY FINANCIAL DATA (UNAUDITED)
 
     The following summarizes unaudited quarterly financial data for the years
ended December 31, 1996 and December 31, 1997:
 
<TABLE>
<CAPTION>
                                                    FOR THE QUARTERS ENDED
                                      ---------------------------------------------------
                1996                  MARCH 30    JUNE 29     SEPTEMBER 28    DECEMBER 31
                ----                  --------    --------    ------------    -----------
                                            (IN THOUSANDS EXCEPT PER SHARE AMOUNTS)
<S>                                   <C>         <C>         <C>             <C>
Net sales...........................  $189,762    $226,737      $215,624       $209,434
Gross profit........................    51,225      63,892        61,687         64,455
Earnings from continuing
  operations........................     3,200       6,000         6,700          7,800
Earnings per share from continuing
  operations:
     Basic..........................  $    .27    $    .58      $    .67       $    .78
     Diluted........................       .27         .57           .66            .77
Net earnings........................     2,400       5,800         6,500          7,300
Net earnings per share:
     Basic..........................  $    .20    $    .56      $    .65       $    .73
     Diluted........................       .20         .55           .64            .72
</TABLE>
 
<TABLE>
<CAPTION>
                                                    FOR THE QUARTERS ENDED
                                      ---------------------------------------------------
                1997                  MARCH 29    JUNE 28     SEPTEMBER 27    DECEMBER 31
                ----                  --------    --------    ------------    -----------
                                            (IN THOUSANDS EXCEPT PER SHARE AMOUNTS)
<S>                                   <C>         <C>         <C>             <C>
Net sales...........................  $194,238    $223,795      $300,380       $415,716
Gross profit........................    56,540      64,353        78,872        102,592
Earnings from continuing
  operations........................     4,700       7,700         8,400          5,600
Earnings per share from continuing
  operations:
     Basic..........................       .48         .80           .88            .59
     Diluted........................       .47         .78           .86            .57
Net earnings........................     3,700       6,700         7,700          3,100
Net earnings per share:
     Basic..........................       .38         .70           .80            .33
     Diluted........................       .37         .68           .78            .32
</TABLE>
 
     See Notes 2 and 9 regarding certain other quarterly transactions included
in the operating results in the above table.
 
     Increased net sales in the third and fourth quarters of 1997, as compared
to 1996, reflect, primarily, the effect of the Ply Gem acquisition (see Note 2).
 
15.  INTERIM FINANCIAL STATEMENTS (UNAUDITED)
 
     (A) The unaudited condensed consolidated financial statements (the
         "Unaudited Financial Statements") presented have been prepared by
         Nortek, Inc. and include all of its wholly-owned subsidiaries (the
         "Company") after elimination of intercompany accounts and transactions,
         without audit and, in the opinion of management, reflect all
         adjustments of a normal recurring nature necessary for a fair statement
         of the interim periods presented. Certain information and footnote
         disclosures normally included in financial statements prepared in
         accordance with generally accepted accounting principles have been
         omitted, although, the Company believes that the disclosures included
         are adequate to make the information presented not misleading. Certain
         amounts in the Unaudited Financial Statements for the prior period have
         been reclassified to conform to the presentation at October 3, 1998,
         and for all periods presented, reflect the operations of the Plumbing
         Products Group as discontinued operations (See Note H). It is suggested
         that
 
                                      F-23
<PAGE>   137
                         NORTEK, INC. AND SUBSIDIARIES
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
         these Unaudited Financial Statements be read in conjunction with the
         financial statements and the notes included in the Company's latest
         Annual Report on Form 10-K.
 
     (B) In March 1997, the Company sold, $175,000,000 principal amount of
         9 1/4% Senior Notes due March 15, 2007 ("9 1/4% Notes") at a slight
         discount. The net proceeds were used to refinance certain outstanding
         indebtedness of the Company's subsidiaries and for acquisitions and
         other general corporate purposes, including investment in plant and
         equipment.
 
     (C) During the second quarter of 1998, the Company sold, in a public
         offering, 2,182,500 shares of its common stock for net proceeds of
         approximately $64,300,000 (the "Common Stock Offering).
 
     (D) Acquisitions are accounted for as purchases and, accordingly, have been
         included in the Company's consolidated results of operations since the
         acquisition date. Purchase price allocations are subject to refinement
         until all pertinent information regarding the acquisitions is obtained.
 
     (E) On July 31, 1998, the Company, through a wholly-owned subsidiary,
         purchased all of the issued and outstanding capital stock of NuTone
         Inc. ("NuTone"), a wholly owned subsidiary of Williams plc ("Williams")
         for an aggregate purchase price of $242,500,000. In connection with the
         acquisition, the Company assumed NuTone's operating liabilities (other
         than intercompany borrowings), including certain liabilities of NuTone
         concerning post-retirement and other benefit obligations. The purchase
         price was funded through the use of the net proceeds from the sale of
         $210,000,000 principal amount of 8 7/8% Senior Notes due August 1, 2008
         (the "Notes") at a slight discount, which occurred on July 31, 1998, in
         a private offering (under an exemption pursuant to Securities and
         Exchange Commission ("SEC") Rule 144A) to qualified investors together
         with approximately $44.8 million of the cash proceeds from the Common
         Stock Offering.
 
   
          Consummation of the Acquisition was subject to an FTC Order under the
          terms of which the Company was required to divest, at no minimum
          price, prior to December 31, 1998, all of the assets, properties,
          business and goodwill of its M&S subsidiary. On December 30, 1998, the
          Company sold M&S, and another Nortek subsidiary -- MOM, after
          obtaining the required FTC approval. (See Note K).
    
 
          On August 26, 1997, a wholly-owned subsidiary of the Company completed
          the acquisition of Ply Gem Industries, Inc. ("Ply Gem") in a tender
          offer for a cash price of $19.50 per outstanding share of common
          stock. Prior to accepting for payment the tendered shares of Ply Gem
          on August 26, 1997, the Company sold $310,000,000 principal amount of
          9 1/8% Senior Notes due September, 2007 (the "9 1/8% Notes") at a
          slight discount. The Company used a portion of these net proceeds,
          together with available cash, to purchase the shares of Ply Gem, fund
          an approximate $45,000,000 payment to terminate Ply Gem's existing
          accounts receivable securitization program and pay certain fees and
          expenses.
 
          The following presents the unaudited Pro Forma net sales, operating
          earnings, earnings from continuing operations and diluted earnings per
          share from continuing operations of the Company for the three months
          and nine months ended September 27, 1997 and October 3, 1998 and the
          year ended December 31, 1997 and gives pro forma effect to the sale of
          the 8 7/8% Notes, the acquisition of Nutone, the Common Stock
          Offering, the acquisition of Ply Gem, the sale of the 9 1/8% Notes,
          the extension of credit under the Ply Gem Credit Facility to refinance
          certain existing indebtedness and the termination of Ply Gem's
          accounts receivable securitization program, the sale of the 9 1/4%
          Notes in March 1997, the refinancing of certain subsidiary
          indebtedness, and reflects estimated cost reductions as described
          below as if such transactions and adjustments had occurred on January
          1, 1997.
 
                                      F-24
<PAGE>   138
                         NORTEK, INC. AND SUBSIDIARIES
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
   
<TABLE>
<CAPTION>
                              THREE MONTHS ENDED           NINE MONTHS ENDED        YEAR ENDED
                          --------------------------   --------------------------   ----------
                          OCTOBER 3,   SEPTEMBER 27,   OCTOBER 3,   SEPTEMBER 27,    DEC. 31,
                             1998          1997           1998          1997           1997
                          ----------   -------------   ----------   -------------   ----------
                                    (AMOUNTS IN THOUSANDS EXCEPT PER SHARE AMOUNTS)
<S>                       <C>          <C>             <C>          <C>             <C>
PRO FORMA
Net sales...............   $473,631      $484,383      $1,410,969    $1,379,321     $1,849,124
Operating earnings......     45,700        20,500         106,300        75,200        107,900
Earnings (loss) from
  continuing
  operations............     12,800        (1,700)         19,600           600          5,900
Diluted earnings (loss)
  per share from
  continuing
  operations............      $1.07           $(.14)        $1.65           $.05          $.49
</TABLE>
    
 
          In computing pro forma earnings, earnings have been reduced by the net
          interest income on the aggregate cash portion of the purchase price of
          the acquisitions at the historical rate earned by the Company and
          interest expense on indebtedness incurred in connection with the
          acquisitions and the refinancing and repayment of certain indebtedness
          of Ply Gem. Earnings have been reduced by amortization of goodwill
          and, in relation to the Ply Gem acquisition, reflect net adjustments
          to depreciation expense as a result of an increase in the estimated
          fair market value of property and equipment and changes in depreciable
          lives. Interest expense on the subsidiary indebtedness refinanced with
          funds from the sale of the 9 1/4% Notes was excluded at an average
          interest rate consistent with the indebtedness outstanding which was
          refinanced, net of tax effect. Interest expense was included on the
          9 1/4% Notes, the 9 1/8% Notes and the Notes, at the applicable coupon
          rates plus actual amortization of deferred debt expense and debt
          discount, net of tax effect. Pro forma results reflect investment
          income earned on the portion of the cash proceeds not used for the
          Acquisition from the actual date of the Common Stock Offering to
          October 3, 1998.
 
          At the date of the NuTone acquisition, the Company achieved cost
          reductions directly attributable to the acquisition from the
          elimination of fees and charges paid by NuTone to Williams and related
          entities. Pro Forma operating earnings have been increased (decreased)
          for the three and nine months ended September 27, 1997 by
          approximately $1,711,000 and $2,586,000, respectively, for the three
          and nine months ended October 3, 1998 by approximately $(30,000) and
          $353,000, respectively, and for the year ended December 31, 1997 by
          approximately $1,746,000 for the pro forma effect of such cost
          reductions. Subsequent to the NuTone acquisition, the Company expects
          to realize approximately $15,000,000 in estimated annual cost
          reductions ("NuTone Cost Reductions") that can be achieved as a result
          of integrating NuTone into the Company's operations. Pro Forma
          earnings, have not been increased for the NuTone Cost Reductions for
          any period presented.
 
          Since the Ply Gem acquisition date, the Company has realized cost
          savings as a result of the acquisition. These savings resulted from
          several actions, including: (i) the elimination of expenses associated
          with Ply Gem's New York headquarters; (ii) the consolidation of Ply
          Gem's corporate functions such as accounting, legal and risk
          management into Nortek; and (iii) the elimination of certain
          under-performing products lines. Pro Forma operating earnings for the
          three and nine months ended September 27, 1997 and the year ended
          December 31, 1997, have been increased for the pro forma effect of
          cost reductions directly attributable to the Ply Gem acquisition
          totaling approximately $262,000, $3,983,000 and $4,000,000
          respectively. Pro Forma operating earnings for the three and nine
          months ended September 27, 1997 and the year ended December 31, 1997,
          do not include the effect of additional estimated cost savings related
          to expenses associated with the elimination of Ply Gem's New York
          headquarters, the consolidation of Ply Gem's corporate functions and
          the elimination of certain under-performing product lines which total
          approximately $4,997,000, $12,661,000, and $14,100,000, respectively.
 
                                      F-25
<PAGE>   139
                         NORTEK, INC. AND SUBSIDIARIES
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
   
          The Ply Gem and NuTone cost savings and reductions are estimates and
          actual savings achieved could differ materially.
    
 
          The pro forma information presented does not purport to be indicative
          of the results which would have been reported if these transactions
          had occurred on January 1, 1997, or which may be reported in the
          future.
 
     (F) The Company's Board of Directors has authorized a number of programs to
         purchase shares of the Company's Common and Special Common Stock. The
         most recent of these programs was announced on April 30, 1997, to
         purchase up to 500,000 shares of the Company's Common and Special
         Common Stock in open market or negotiated transactions, subject to
         market conditions, cash availability and provisions of the Company's
         outstanding debt instruments. As of November 6, 1998, the Company has
         purchased approximately 356,400 shares of its Common and Special Common
         Stock under this program for approximately $10,224,000 and accounted
         for such share purchases as Treasury Stock.
 
         At November 6, 1998, approximately $61,100,000 was available for the
         payment of cash dividends or stock purchases under the terms of the
         Company's most restrictive indenture.
 
     (G) In the fourth quarter of 1997, the Company adopted the provisions of
         SFAS No. 128, "Earnings Per Share." This statement requires a
         restatement of all prior-period earnings per share ("EPS") data
         presented. Accordingly, EPS for the second quarter and first six months
         of 1997 has been restated.
 
         Basic earnings per share amounts have been computed using the weighted
         average number of common and common equivalent shares outstanding
         during each period. Special Common Stock is treated as the equivalent
         of Common Stock in determining earnings per share results. Diluted
         earnings per share amounts have been computed using the weighted
         average number of common and common equivalent shares and the dilutive
         potential common shares outstanding during each period.
 
                                      F-26
<PAGE>   140
                         NORTEK, INC. AND SUBSIDIARIES
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
     A reconciliation between basic and diluted earnings per share from
continuing operations is as follows:
 
<TABLE>
<CAPTION>
                                  THREE MONTHS ENDED              NINE MONTHS ENDED
                              ---------------------------    ---------------------------
                              OCTOBER 3,    SEPTEMBER 27,    OCTOBER 3,    SEPTEMBER 27,
                                 1998           1997            1998           1997
                              ----------    -------------    ----------    -------------
                                       (IN THOUSANDS EXCEPT PER SHARE AMOUNTS)
<S>                           <C>           <C>              <C>           <C>
Earnings from continuing
  operations................   $13,300         $8,400         $23,100         $20,800
Basic EPS:
     Basic common shares....    11,721          9,569          10,660           9,632
                               =======         ======         =======         =======
     Basic EPS..............   $  1.13         $  .87         $  2.17         $  2.16
                               =======         ======         =======         =======
Diluted EPS:
     Basic common shares....    11,721          9,569          10,660           9,632
     Plus: Impact of stock
       options..............       230            272             198             246
                               -------         ------         -------         -------
     Diluted common
       shares...............    11,951          9,841          10,858           9,878
                               =======         ======         =======         =======
     Diluted EPS............   $  1.11         $  .85         $  2.13         $  2.11
                               =======         ======         =======         =======
</TABLE>
 
     (H) In the fourth quarter of 1997, the Company adopted a plan of
         disposition for its Plumbing Products Group and provided a pre-tax
         reserve of $2,500,000 for future expenses including interest expense.
         On July 10, 1998, the Company sold its Plumbing Products Group,
         including a product line included in the Company's Residential Building
         Products Group, for approximately $33,700,000. In the nine months ended
         October 3, 1998, approximately $1,000,000, of corporate interest
         expense was allocated against this reserve. In the three months and
         nine months ended September 27, 1997, the loss for discontinued
         operations included an allocation of corporate interest expense of
         approximately $425,000 and $1,375,000, respectively. The following is
         an unaudited summary of the results of discontinued operations for the
         three months and nine months ended September 27, 1997;
 
<TABLE>
<CAPTION>
                                                THREE MONTHS          NINE MONTHS
                                                   ENDED                 ENDED
                                             SEPTEMBER 27, 1997    SEPTEMBER 27, 1997
                                             ------------------    ------------------
                                             (IN THOUSANDS EXCEPT PER SHARE AMOUNTS)
<S>                                          <C>                   <C>
Net sales..................................       $27,376               $78,561
                                                  =======               =======
Loss before income taxes...................       $  (900)              $(4,200)
Income tax benefit.........................           200                 1,500
                                                  -------               -------
Loss from discontinued operations..........       $  (700)              $(2,700)
                                                  =======               =======
</TABLE>
 
     (I) In the first quarter of 1998, the Company adopted Statement of
         Financial Accounting Standards No. 130, "Reporting Comprehensive
         Income," ("SFAS No. 130") which requires the display of comprehensive
         income and its components in the financial statements. Comprehensive
         income includes net earnings and unrealized gains and losses from
         currency translation, marketable securities and pension liability
         adjustments. The components of the Company's comprehensive income and
         the effect on earnings, for the third quarter and first nine months of
         1997 and 1998, are detailed in the Statements of Stockholders'
         Investment.
 
     (J) In June 1998, the Financial Accounting Standards Board issued Statement
         of Financial Accounting Standards No. 133, Accounting for Derivative
         Instruments and Hedging Activities. The Statement establishes
         accounting and reporting standards requiring that every derivative
         instrument (including certain derivative instruments embedded in other
         contracts) be recorded in the balance sheet as either an asset or
         liability measured at its fair value. The Statement requires that
         changes in the
 
                                      F-27
<PAGE>   141
                         NORTEK, INC. AND SUBSIDIARIES
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
         derivative's fair value be recognized currently in earnings unless
         specific hedge accounting criteria are met. Special accounting for
         qualifying hedges allows a derivative's gains and losses to offset
         related results on the hedged item in the income statement, and
         requires that a company must formally document, designate, and assess
         the effectiveness of transactions that receive hedge accounting.
 
         Statement 133 is effective for fiscal years beginning after June 15,
         1999. A company may also implement the Statement as of the beginning
         of any fiscal quarter after issuance (that is, fiscal quarters
         beginning June 16, 1998 and thereafter). Statement 133 cannot be
         applied retroactively. Statement 133 must be applied to (a) derivative
         instruments and (b) certain derivative instruments embedded in hybrid
         contracts that were issued, acquired, or substantively modified after
         December 31, 1997 (and, at the Company's election, before January 1,
         1998).
 
         The Company is in the process of quantifying the impacts of adopting
         Statement 133 on its financial statements and has not determined the
         timing of or method of adoption of Statement 133.
 
   
     (K) During 1998, the Company made several dispositions of nonstrategic
         assets of Ply Gem. On May 8, 1998, the Company sold Studley. Studley, a
         vacuum bag manufacturer which had net sales and an operating loss of
         approximately $7,300,000 and $1,600,000, respectively, for the period
         January 1, 1998 to May 8, 1998, was treated as an operation held for
         sale since the Ply Gem Acquisition. The Company valued the assets and
         liabilities of Studley on a net realizable value basis. For the period
         from August 26, 1997 (the acquisition of Studley) through May 8, 1998,
         the operations of Studley resulted in an operating loss of
         approximately $4,700,000 which has been excluded from the consolidated
         continuing operations of the Company and which includes approximately
         $100,000 of allocated interest expense. These losses have been funded
         by the Company and have been accounted for as an adjustment to the net
         realizable value of Studley. The ultimate disposition of Studley
         resulted in an increase in goodwill of the Company of approximately
         $100,000. On May 22, 1998, the Company consummated the sale of
         Sagebrush for approximately $9,100,000 in cash. Sagebrush had net
         sales, operating earnings (and earnings from continuing operations
         before provision for income taxes) and EBITDA of approximately
         $19,000,000, $206,000 and $347,000, respectively, for the five months
         ended May 22, 1998. On July 2, 1998, the Company completed the sale of
         Goldenberg for approximately $11,000,000, including approximately
         $2,100,000 in notes. Goldenberg had net sales, operating earnings (and
         earnings from continuing operations before provision for income taxes)
         and EBITDA of approximately $21,500,000, $359,000 and $672,000,
         respectively, for the six months ended July 4, 1998. On July 31, 1998,
         the Company completed the sale of another Ply Gem business, Ply Gem
         Manufacturing, which had net sales, operating earnings (and earnings
         from continuing operations before provision for income taxes) and
         EBITDA of approximately $23,300,000, $665,000 and $746,000,
         respectively, for the seven months ended July 31, 1998. On December 10,
         1998, the Company sold Allied for approximately $16.5 million in cash
         and approximately $7.0 million in Notes. Approximately $7.7 of the
         proceeds was used to pay down debt. Allied had net sales, operating
         earnings (and earnings from continuing operations before provision for
         income taxes) and EBITDA of approximately $67.3 million, $1.2 million
         and $1.4 million, respectively, for the nine months ended October 3,
         1998. The operating results of Sagebrush, Goldenberg, Ply Gem
         Manufacturing and Allied are included in the Company's 1997 and 1998
         consolidated results from the date of acquisition to the date of sale.
         The sale of these businesses did not have a material effect on the
         Company's operating or financial position.
    
 
   
         On December 30, 1998, the Company sold the businesses of two
         wholly-owned subsidiaries -- M&S and MOM -- to the Chamberlain Group,
         Inc. M&S manufactures and sells intercom systems, built-in music
         systems, central vacuum systems and related products. MOM sells
         automatic garage door openers, gate operators and electronic
         transmitters. For the year ended
    
 
                                      F-28
<PAGE>   142
                         NORTEK, INC. AND SUBSIDIARIES
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
   
         December 31, 1997, net sales, operating earnings (and earnings from
         continuing operations before provision for income taxes) and EBITDA of
         M&S and MOM combined were approximately $37,300,000, $3,400,000 and
         $4,100,000, respectively. For the three months ended October 3, 1998,
         net sales, operating earnings (and earnings from continuing operations
         before provision for income taxes) and EBITDA of M&S and MOM combined
         were approximately $10,900,000, $1,000,000 and $1,200,000,
         respectively. For the nine months ended October 3, 1998, net sales,
         operating earnings (and earnings from continuing operations before
         provision for income taxes) and EBITDA of M&S and MOM combined were
         approximately $31,700,000, $2,700,000 and $3,300,000, respectively.
    
 
   
     (L) On October 9, 1998, the Company completed the acquisition of Napco,
         Inc. ("Napco"), a privately held manufacturer of exterior building
         products headquartered in Valencia, Pennsylvania for approximately
         $81,200,000 in cash plus the assumption of debt of approximately
         $10,200,000. Napco manufactures four principal product lines: (a) vinyl
         siding, soffit and accessories, marketed under the American Comfort(R),
         American Herald(TM) and American '76(R) collection labels; (b) vinyl
         window systems, marketed under the Premium and American Comfort(R)
         labels; (c) accessory products, including aluminum-trim coil, soffit,
         rainware and related specialty products; and (d) coil coating. Napco's
         manufacturing operations are conducted in three company-owned plants
         that are located in western Pennsylvania. For the year ended December
         31, 1997, Napco had net sales, operating earnings, earnings from
         continuing operations before income taxes and EBITDA of approximately
         $91,100,000, $8,600,000, 8,000,000 and $10,800,000, respectively.
    
 
     (M) The Year 2000 ("Y2K") issue refers to and arises from deficient
         computer programs and related products, such as embedded chips, which
         do not properly recognize or process a year that begins with "20"
         instead of "19." If not corrected, many business and other processes
         could fail or create erroneous results. The extent of the potential
         impact of the Y2K issue is not yet known, and if not timely corrected,
         it could affect the global economy. Although the Company believes that
         all modifications to information technology ("IT") and non-IT systems,
         material to the Company's business, will be Y2K compliant on or before
         December 31, 1999, it cannot predict the outcome or the success of its
         Y2K initiative, or that third party systems are or will be Y2K
         compliant, or that the costs required to address the Y2K issue, or that
         the impact of a failure to achieve substantial Y2K compliance, will not
         have a material adverse effect on the company's business, financial
         condition or results of operations.
 
                                      F-29
<PAGE>   143
 
                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
To the Board of Directors of
Williams Y&N Holdings, Inc.
Parent of NuTone Inc. and Subsidiary
 
     We have audited the accompanying consolidated balance sheet of NuTone Inc.
and Subsidiary (the "Company") as of December 31, 1997, and the related
consolidated statements of operations, shareholder's net investment and cash
flows for the year then ended. These financial statements are the responsibility
of the Company's management. Our responsibility is to express an opinion on
these financial statements based on our audit.
 
     We conducted our audit in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audit provides a reasonable basis for our opinion.
 
   
     As described in Note 3 to the consolidated financial statements, the
Company has not "pushed down" certain purchase accounting adjustments related to
its acquisition by the parent company, Williams plc, in 1991. In our opinion,
generally accepted accounting principles, as established by the Securities and
Exchange Commission for public companies, require that such adjustments be
reflected in the financial statements.
    
 
   
     In our opinion, except for the effects of not pushing down certain purchase
accounting adjustments as described in the preceding paragraph, the financial
statements referred to above present fairly, in all material respects, the
consolidated financial position of NuTone Inc. and Subsidiary as of December 31,
1997 and the consolidated results of its operations and its cash flows for the
year then ended, in conformity with generally accepted accounting principles.
    
 
                                            COOPERS & LYBRAND L.L.P.
 
Cincinnati, Ohio
February 20, 1998
 
                                      F-30
<PAGE>   144
 
                           NUTONE INC. AND SUBSIDIARY
 
                           CONSOLIDATED BALANCE SHEET
 
<TABLE>
<CAPTION>
                                                              DECEMBER 31,      JULY 4,
                                                                  1997           1998
                                                              ------------    -----------
                                                                              (UNAUDITED)
                                                                (AMOUNTS IN THOUSANDS)
<S>                                                           <C>             <C>
                                         ASSETS
Current assets:
     Cash...................................................   $     840       $   1,972
     Accounts receivable, less allowance for doubtful
      accounts of $1,373 and $1,372.........................      30,304          29,271
     Inventories............................................       4,804           4,681
     Deferred tax asset, current............................       4,880           5,100
     Prepaid expenses and other current assets..............       4,688           5,313
                                                               ---------       ---------
          Total current assets..............................      45,516          46,337
Property, plant and equipment, net..........................      18,212          18,318
Deferred tax asset, noncurrent..............................      14,123          13,676
Other noncurrent assets.....................................         289              --
                                                               ---------       ---------
          Total assets......................................   $  78,140       $  78,331
                                                               =========       =========
                                       LIABILITIES
Current liabilities:
     Accounts payable.......................................   $  23,134       $  17,547
     Payable to Parent and related entities.................      11,508          15,004
     Accrued expenses and other.............................      15,635          13,957
                                                               ---------       ---------
          Total current liabilities.........................      50,277          46,508
Pension liability...........................................      12,883          13,033
Post-retirement medical benefits liability..................      27,820          27,427
Accrued warranty............................................       4,990           5,482
Long-term debt to Parent and related entities...............     131,000         131,000
                                                               ---------       ---------
          Total liabilities.................................     226,970         223,450
                                                               ---------       ---------
Contingencies
                         SHAREHOLDER'S NET INVESTMENT (DEFICIT)
Shareholder's net investment (deficit)......................    (148,830)       (145,119)
                                                               ---------       ---------
          Total liabilities and shareholder's net investment
            (deficit).......................................   $  78,140       $  78,331
                                                               =========       =========
</TABLE>
 
   The accompanying notes are an integral part of the consolidated financial
                                  statements.
                                      F-31
<PAGE>   145
 
                           NUTONE INC. AND SUBSIDIARY
 
                      CONSOLIDATED STATEMENT OF OPERATIONS
 
<TABLE>
<CAPTION>
                                                                FOR THE      SIX MONTHS   SIX MONTHS
                                                               YEAR ENDED      ENDED        ENDED
                                                              DECEMBER 31,    JUNE 28,     JULY 4,
                                                                  1997          1997         1998
                                                              ------------   ----------   ----------
                                                                             (UNAUDITED)  (UNAUDITED)
                                                                          (IN THOUSANDS)
<S>                                                           <C>            <C>          <C>
Net sales...................................................   $ 199,072      $ 95,177     $ 95,223
Cost of goods sold..........................................    (122,897)      (59,416)     (60,772)
                                                               ---------      --------     --------
          Gross profit......................................      76,175        35,761       34,451
Selling, general and administrative expenses................     (51,387)      (25,184)     (24,075)
                                                               ---------      --------     --------
          Income from operations............................      24,788        10,577       10,376
Other income (expense):
     Interest expense.......................................     (11,852)       (5,971)      (6,113)
     Other income, net......................................          42            17           23
                                                               ---------      --------     --------
          Income before income taxes........................      12,978         4,623        4,286
Provision for income taxes..................................      (5,043)       (1,849)      (1,714)
                                                               ---------      --------     --------
               Net income...................................   $   7,935      $  2,774     $  2,572
                                                               =========      ========     ========
Other comprehensive income, net of tax:
     Pension liability adjustment...........................         503           505           --
     Foreign currency translation adjustment................         (49)           --           --
                                                               ---------      --------     --------
          Total other comprehensive income..................         454           505           --
                                                               ---------      --------     --------
          Comprehensive Income..............................   $   8,389      $  3,279     $  2,572
                                                               =========      ========     ========
</TABLE>
 
   The accompanying notes are an integral part of the consolidated financial
                                  statements.
                                      F-32
<PAGE>   146
 
                           NUTONE INC. AND SUBSIDIARY
 
             CONSOLIDATED STATEMENT OF SHAREHOLDER'S NET INVESTMENT
                      FOR THE YEAR ENDED DECEMBER 31, 1997
            AND THE SIX MONTHS ENDED JUNE 28, 1997 AND JULY 4, 1998
 
<TABLE>
<CAPTION>
                                                              SHAREHOLDER'S
                                                              NET INVESTMENT
                                                                (DEFICIT)
                                                              --------------
                                                              (IN THOUSANDS)
<S>                                                           <C>
Balance, December 31, 1996..................................    $(147,062)
Net Income (unaudited)......................................        2,774
Pension liability adjustment (unaudited)....................          505
Capital contribution from Parent (unaudited)................        1,417
                                                                ---------
Balance, June 28, 1997 (unaudited)..........................    $(142,366)
                                                                =========
Balance, December 31, 1996..................................    $(147,062)
Net income..................................................        7,935
Foreign currency translation adjustment.....................          (49)
Pension liability adjustment................................          503
Capital contribution from Parent............................        2,243
Dividend to Parent..........................................      (12,400)
                                                                ---------
Balance, December 31, 1997..................................    $(148,830)
Net Income (unaudited)......................................        2,572
Capital Contribution from Parent (unaudited)................        1,139
                                                                ---------
Balance, July 4, 1998 (unaudited)...........................    $(145,119)
                                                                =========
</TABLE>
 
   The accompanying notes are an integral part of the consolidated financial
                                  statements.
                                      F-33
<PAGE>   147
 
                           NUTONE INC. AND SUBSIDIARY
 
                      CONSOLIDATED STATEMENT OF CASH FLOWS
 
<TABLE>
<CAPTION>
                                                            FOR THE       SIX MONTHS     SIX MONTHS
                                                           YEAR ENDED        ENDED          ENDED
                                                          DECEMBER 31,     JUNE 28,        JULY 4,
                                                              1997           1997           1998
                                                          ------------    -----------    -----------
                                                                          (UNAUDITED)    (UNAUDITED)
                                                                        (IN THOUSANDS)
<S>                                                       <C>             <C>            <C>
Cash flows from operating activities:
     Net income.........................................    $  7,935       $  2,774       $  2,572
Adjustments to reconcile net income to net cash provided
  by operating activities:
     Depreciation expense...............................       3,416          1,786          1,676
     Deferred tax provision.............................        (555)          (515)           227
     Loss on sale of fixed assets.......................          16             27             (1)
     (Increase) Decrease in accounts receivable.........       3,604          5,985          1,033
     (Increase) Decrease in inventories.................      (1,065)        (2,417)           123
     (Increase) Decrease in prepaid expenses and other
       current assets...................................         339           (316)          (625)
     Increase (Decrease) in accounts payable............       3,784         (2,787)        (5,587)
     Increase in accrued expenses.......................         583           (789)        (1,186)
     Increase (Decrease) in pension liability...........      (1,119)           156            439
     Increase (Decrease) in post-retirement medical
       benefit liability................................       1,018           (197)          (393)
                                                            --------       --------       --------
          Net cash provided by operating activities.....      17,956          3,707         (1,722)
                                                            --------       --------       --------
Cash flows from investment activities:
     Proceeds from sale of fixed assets.................          11              7             10
     Capital expenditures...............................      (3,663)        (1,721)        (1,791)
                                                            --------       --------       --------
          Net cash used in investing activities.........      (3,652)        (1,714)        (1,781)
                                                            --------       --------       --------
Cash flows from financing activities:
     Dividends paid to Parent...........................     (12,400)            --             --
     Contributions from Parent and related entities.....       2,243          1,417          1,139
     Change in amount due to/from Parent and related
       entities.........................................      (4,250)        (3,577)         3,496
     Foreign currency translation adjustment............         (49)            --             --
                                                            --------       --------       --------
          Net cash used in financing activities.........     (14,456)        (2,160)         4,635
                                                            --------       --------       --------
Net increase (decrease) in cash.........................        (152)          (167)         1,132
Cash at beginning of year...............................         992            992            840
                                                            --------       --------       --------
Cash at end of year.....................................    $    840       $    825       $  1,972
                                                            ========       ========       ========
Supplemental cash flow information:
     Cash paid for interest.............................    $ 12,141       $    559       $  5,916
                                                            ========       ========       ========
</TABLE>
 
   The accompanying notes are an integral part of the consolidated financial
                                  statements.
                                      F-34
<PAGE>   148
 
                           NUTONE INC. AND SUBSIDIARY
 
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
 
1.  PURPOSE OF FINANCIAL STATEMENTS:
 
     The financial statements of NuTone Inc. and Subsidiary (the "Company") have
been prepared in connection with the proposed sale of the capital stock of the
Company by its ultimate parent company, Williams plc ("Williams" or the
"Parent"), a U.K. Company, to Nortek, Inc., pursuant to an agreement dated March
9, 1998.
 
     The consolidated financial statements include the accounts of NuTone Inc.
(U.S.) and its wholly owned subsidiary, NuTone Canada Inc.
 
     Certain properties, while historically part of the Company, have been
excluded from these financial statements, as the related assets, liabilities and
costs will not be a part of the proposed transaction. These properties, at
December 31, 1997, are non-operating and are not material to the Company's
financial position or 1997 results of operations.
 
2.  NATURE OF BUSINESS:
 
     The Company is principally engaged in the manufacturing and sale of
household fixtures, such as ventilation fans and heaters, range hoods, door
chimes, bathroom cabinets, and intercom systems. The Company's primary
manufacturing operations are located in Cincinnati, Ohio and the Company also
has a manufacturing facility in Coppell, Texas. Approximately 99% of its 1997
sales were to customers in the United States and Canada.
 
3.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES:
 
     The following is a summary of the significant accounting policies followed
in the preparation of these consolidated financial statements.
 
   
     a.  Basis of Presentation:  The Company's consolidated financial
statements, which have been prepared on the basis of U.S. generally accepted
accounting principles, reflect the actual results of operations, financial
position, changes in shareholder's net investment, and cash flows as if it were
a separate stand-alone entity for all periods presented. For all fiscal periods
presented, the Company was owned by Williams who acquired the Company in 1991
and utilized the purchase method of accounting. Pursuant to regulations
established by the Securities and Exchange Commission for public companies,
generally accepted accounting principles require that the new purchase
accounting basis in an acquired company's assets be "pushed down" to a
subsidiary's stand-alone financial statements. The Company's financial
statements do not reflect the effects of applying "push down accounting". Had
push down accounting been applied to the Company's financial statements, the
balance sheets and statements of operations of the Company would have been
adjusted to reflect the effects of push down accounting on inventory and
property, plant and equipment and to record a new asset and related amortization
for goodwill.
    
 
     General corporate overhead expenses related to Williams' corporate
headquarters and common support functions have been allocated to the Company, to
the extent such amounts are applicable to the Company, based on the ratio of the
Company's budgeted sales to budgeted sales of all companies within the Williams
U.S. consolidated group. Management believes these allocations are reasonable.
However, the costs of these services charged to the Company are not necessarily
indicative of the costs that would have been incurred if the Company had
performed these functions as a stand-alone entity. As a result of the proposed
sale described in Note 1, the Company, or the acquirer, will be required to
perform certain of these functions using its own resources, or purchased
services, and will be responsible for the costs and expenses associated with the
management of the Company.
 
     The financial information included herein may not necessarily reflect the
consolidated results of operations, financial position and cash flows of the
Company which would have resulted had the Company been a separate, stand-alone
entity during the period presented.
 
                                      F-35
<PAGE>   149
                           NUTONE INC. AND SUBSIDIARY
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
     b.  Basis of Consolidation:  The consolidated financial statements include
the accounts of NuTone Inc. and its wholly-owned subsidiary, NuTone Canada Inc.
All significant intercompany transactions and accounts have been eliminated.
 
     c.  Foreign Currency Translation:  For international operations, assets and
liabilities are translated into U.S. dollars at year-end exchange rates, and
revenues and expenses are translated at average exchange rates prevailing during
the year. Translation adjustments, resulting from fluctuations in exchange
rates, are included in shareholder's net investment.
 
     d.  Use of Estimates:  The preparation of consolidated financial statements
in conformity with generally accepted accounting principles requires management
to make estimates and assumptions that affect the reported amounts of assets and
liabilities and disclosure of contingent assets and liabilities at the date of
the consolidated financial statements and the reported amounts of revenues and
expenses during the reporting period. Actual results could differ from those
estimates.
 
     e.  Research and Development Expenses:  Research and development expenses
are charged to operations as incurred. Research and development expense was
approximately $1,377,000 for the year ended December 31, 1997.
 
     f.  Inventories:  Inventories are stated at the lower of cost or market,
with cost being determined on the last in, first out (LIFO) method.
 
     g.  Property, Plant and Equipment:  Property, plant and equipment,
including the cost of certain tooling, is recorded at cost and depreciated on
the straight-line basis over the following useful lives:
 
<TABLE>
<S>                                                           <C>
Buildings...................................................       40 years
Building improvements.......................................       10 years
Machinery and equipment.....................................  4 to 10 years
Furniture, fixtures and computer equipment..................  5 to 10 years
Tools and dies..............................................        5 years
</TABLE>
 
     Repairs and maintenance expenditures are charged to income as incurred,
whereas replacements, betterments and improvements are capitalized. Upon sale or
retirement, the cost and related accumulated depreciation are eliminated from
the respective accounts and the resulting gain or loss is included in
operations.
 
     h.  Product Warranty Expense:  The estimated amount of product warranty
costs is accrued in the period in which the related sale is made.
 
     i.  Advertising Costs:  The Company expenses advertising costs the first
time the advertising takes place. Advertising expense was $4,942,000 for the
year ended December 31, 1997.
 
     j.  Income Taxes:  The Company's operations have historically been included
in the income tax returns filed by a subsidiary of Williams. However, income tax
expense in the Company's consolidated financial statements has been calculated
as if the Company had filed separate tax returns for all periods presented.
 
     The Company is a member of a consolidated U.S. tax group. Under a tax
sharing agreement with intermediate and ultimate parent companies, the Company
is not charged for taxes on its operations. The Company's current tax provision
has been accounted for as a capital contribution.
 
     k.  Statement of Cash Flows:  The Company considers all highly liquid debt
instruments purchased with a maturity of three months or less to be cash
equivalents.
 
                                      F-36
<PAGE>   150
                           NUTONE INC. AND SUBSIDIARY
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
4.  INVENTORIES:
 
     At December 31, 1997, inventories were as follows:
 
<TABLE>
<CAPTION>
                                                              (IN THOUSANDS)
<S>                                                           <C>
Raw materials and work-in-process...........................     $13,738
Finished goods..............................................      14,665
                                                                 -------
                                                                  28,403
Less reserve for LIFO valuation.............................      23,599
                                                                 -------
          Total inventories.................................     $ 4,804
                                                                 =======
</TABLE>
 
5.  PROPERTY, PLANT AND EQUIPMENT:
 
     At December 31, 1997, property, plant and equipment consisted of:
 
<TABLE>
<CAPTION>
                                                              (IN THOUSANDS)
<S>                                                           <C>
Land, building and improvements.............................     $13,828
Machinery and equipment.....................................      20,697
Furniture, fixtures and computer equipment..................       5,997
Tools and dies..............................................      13,999
Construction in progress....................................       3,150
                                                                 -------
                                                                  57,671
Less accumulated depreciation...............................      39,459
                                                                 -------
                                                                 $18,212
                                                                 =======
</TABLE>
 
6.  LONG-TERM DEBT TO SUBSIDIARY OF PARENT COMPANY:
 
     The Company has a promissory note payable to a wholly-owned subsidiary of
the Parent of $131,000,000, due on September 7, 2001. Interest is paid in
semi-annual installments in June and December at a rate of 8.5%.
 
7.  EMPLOYEE BENEFIT PLANS:
 
     The Company has a defined contribution plan covering predominantly
non-union employees of NuTone Inc. (U.S.). Under the Plan, participants can
elect to defer up to 10% of their eligible earnings on a pre-tax basis, with the
Company matching 50% of the first 5% of deferred earnings. During 1997, the
Company's contribution to the plan was $347,000.
 
     The Company has six noncontributory defined benefit pension plans (the
"Plans") covering substantially all employees, with benefits for salaried
employees based on years of service and the employee's career compensation, and
benefits for hourly paid employees based on years of service. The Company
accrues expense for the Plans in accordance with generally accepted accounting
principles and makes contributions to the Plans in accordance with an agreed
funding policy, which are deductible for federal income tax purposes.
 
     At December 31, 1997, substantially all of the assets of the defined
benefit plans were included with those of other Williams subsidiaries in the
United States and held as part of a master trust. Plan assets, as stated below,
represent the Company's proportionate share of the net assets of the master
trust.
 
                                      F-37
<PAGE>   151
                           NUTONE INC. AND SUBSIDIARY
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
     The following table sets forth the principal Plans' funded status and
amounts recognized in the Company's balance sheet, utilizing information from
the latest actuarial valuation date, December 31, 1997:
 
<TABLE>
<CAPTION>
                                                               NUTONE     NUTONE
                                                               (U.S.)     (U.S.)
                                                              SALARIED    HOURLY
                                                              --------    -------
                                                                (IN THOUSANDS)
<S>                                                           <C>         <C>
Actuarial present value of benefit obligations:
     Accumulated benefit obligation, primarily vested.......  $42,851     $25,383
                                                              =======     =======
Projected benefit obligation for services rendered to
  date......................................................  $46,816     $25,383
Plan assets at fair value, primarily cash equivalents and
  marketable securities.....................................   37,350      23,086
                                                              -------     -------
Projected benefit obligation in excess of plan assets.......    9,466       2,297
Unrecognized net gain (loss) from past experience different
  from that assumed and effects of changes in assumptions...    3,920         723
Unrecognized prior service cost.............................       --      (1,012)
Additional minimum liability................................       --         289
                                                              -------     -------
Accrued pension liability...................................  $13,386     $ 2,297
                                                              =======     =======
</TABLE>
 
     The deferred tax asset associated with employee pensions and other benefits
is disclosed in Note 9.
 
     Net pension expense, reflected in both cost of sales and general and
administrative expenses, for the year ended December 31, 1997, included the
following components:
 
<TABLE>
<CAPTION>
                                                               NUTONE     NUTONE
                                                               (U.S.)     (U.S.)
                                                              SALARIED    HOURLY
                                                              --------    -------
                                                                (IN THOUSANDS)
<S>                                                           <C>         <C>
Service cost................................................  $   910     $   363
Interest cost...............................................    3,335       1,851
Actual return on plan assets................................   (4,424)     (2,637)
Net amortization and deferral...............................    1,374         906
                                                              -------     -------
Net pension expense.........................................  $ 1,195     $   483
                                                              =======     =======
</TABLE>
 
     For 1997, the discount rate and rate of increase in future compensation
levels used in determining the actuarial present value of the projected benefit
obligation was 7.5% and 4.5%, respectively. The expected long-term rate of
return on assets was 9%.
 
8.  POSTRETIREMENT BENEFITS OTHER THAN PENSIONS:
 
     The Company provides certain medical and life insurance benefits to
eligible retired employees. Hourly employees at the Cincinnati, Ohio location
covered by a collective bargaining agreement, hired before June 12, 1992, and
non-union employees, hired before January 1, 1994, generally become eligible for
retiree medical and life insurance benefits on retirement. Pre-age 65 retirees
are paid covered medical expenses, including drugs, less deductibles or
co-payments. Post-age 65 retiree medical expenses are offset by Medicare
benefits.
 
                                      F-38
<PAGE>   152
                           NUTONE INC. AND SUBSIDIARY
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
     The following table sets forth the funded status and amounts recognized in
the Company's balance sheet at December 31, 1997:
 
<TABLE>
<CAPTION>
                                                              (IN THOUSANDS)
<S>                                                           <C>
Accumulated postretirement benefit obligation:
  Retirees..................................................     $17,234
  Fully eligible active participants........................       5,347
  Other active participants.................................       5,084
                                                                 -------
          Total unfunded accumulated postretirement benefit
            obligation......................................      27,665
Unrecognized net gain.......................................       1,555
                                                                 -------
  Accrued postretirement benefit obligation.................     $29,220
                                                                 =======
</TABLE>
 
     The assumed health care cost trend rate used in measuring the accumulated
postretirement benefit obligation was 8% in 1997, declining by 1% in 1998 and
declining by 0.5% thereafter through 2004 to an ultimate rate of 4.0%. If the
health care cost trend rate assumptions were increased by 1%, the accumulated
postretirement benefit obligation, as of December 31, 1997, would have increased
by $3,570,000. The effect of this change on the sum of the service cost and
interest cost components of net periodic postretirement benefit cost for 1997
would have been an increase of $381,000.
 
     The deferred tax asset associated with employee pensions and other benefits
is disclosed in Note 9.
 
     The components of net periodic postretirement benefit cost for the year
ended December 31, 1997 were as follows:
 
<TABLE>
<CAPTION>
                                                              (IN THOUSANDS)
<S>                                                           <C>
Service cost................................................      $  431
Interest cost on accumulated post retirement benefit
  obligation................................................       2,064
Net amortization............................................         (26)
                                                                  ------
          Total expense.....................................      $2,469
                                                                  ======
</TABLE>
 
     The discount rate used in determining the accumulated postretirement
benefit obligation and net periodic postretirement benefit cost was 7.5% as of
December 31, 1997.
 
9.  INCOME TAXES:
 
     The following table presents the principal components of the difference
between the U.S. federal statutory income tax rate and the effective tax rate
for the year ended December 31, 1997:
 
<TABLE>
<S>                                                           <C>
Federal income tax rate.....................................   35%
Tax effect of foreign losses................................   (1)%
Effect of state and local taxes, net of federal tax.........    5%
                                                              ---
Effective tax rate..........................................   39%
                                                              ===
</TABLE>
 
The Company's tax provision includes a provision for income taxes in foreign tax
                                 jurisdictions.
 
                                      F-39
<PAGE>   153
                           NUTONE INC. AND SUBSIDIARY
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
     The following table presents the U.S. and foreign components of income tax
expense for the year ended December 31, 1997:
 
<TABLE>
<CAPTION>
                                                              (IN THOUSANDS)
<S>                                                           <C>
Income tax expense (benefit):
     Current:
          Federal...........................................     $ 4,327
          State and local...................................       1,256
          Foreign...........................................          15
     Deferred:
          Federal...........................................        (443)
          State and local...................................        (112)
                                                                 -------
               Total income tax expense.....................     $ 5,043
                                                                 =======
</TABLE>
 
     Deferred income tax liabilities are taxes that the Company expects to pay
in future periods. Conversely, deferred income tax assets are tax benefits
recognized for expected reductions in future taxes payable. Deferred income
taxes arise because of differences in the financial reporting and tax bases of
certain assets and liabilities. Deferred income tax assets and liabilities
included in the balance sheet at December 31, 1997 were as follows:
 
<TABLE>
<CAPTION>
                                                              (IN THOUSANDS)
<S>                                                           <C>
Deferred income tax assets:
     Employee pensions and other benefits...................     $17,804
     Accrued warranty.......................................       2,996
  Balance sheet reserves and allowances.....................       3,258
                                                                 -------
          Total deferred income tax assets..................      24,058
                                                                 -------
Deferred income tax liabilities:
     Property, plant, and equipment.........................       3,997
     Accounts receivable....................................       1,058
                                                                 -------
          Total deferred income tax liabilities.............       5,055
                                                                 -------
          Total net deferred income tax assets..............     $19,003
                                                                 =======
</TABLE>
 
10.  LEASES:
 
     The Company leases manufacturing and warehouse facilities and other
equipment under various operating leases. Total rent expense for the year ended
December 31, 1997 was approximately $1,309,000.
 
     Future minimum rental payments required under all leases that have
remaining noncancelable lease terms in excess of one year, as of December 31,
1997, are as follows:
 
<TABLE>
<CAPTION>
                                                              (IN THOUSANDS)
<S>                                                           <C>
1998........................................................     $   995
1999........................................................       1,053
2000........................................................         616
2001........................................................         424
Thereafter..................................................          --
                                                                 -------
     Total minimum payments required........................     $ 3,088
                                                                 =======
</TABLE>
 
                                      F-40
<PAGE>   154
                           NUTONE INC. AND SUBSIDIARY
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
11.  RELATED PARTY TRANSACTIONS:
 
     Management fees charged to the Company by its Parent in 1997 were
$1,676,000.
 
     The Company maintains a revolving loan with a fellow wholly-owned
subsidiary of the Parent. The loan has no stated due date and is due and payable
upon demand by this subsidiary. The Company is charged interest on outstanding
balances, based on the prime rate (8.5% at December 31, 1997), which is payable
monthly. In situations where the Company has advanced funds to this subsidiary,
it receives interest at the prime rate less 1%. Interest expense, net of
interest income, on this revolving loan and on the long-term debt discussed in
Note 6, was $11,852,000 in 1997.
 
12.  MAJOR CUSTOMER:
 
     The Company derived approximately 22% of its consolidated net sales from
one customer in 1997.
 
13.  CONTINGENCIES:
 
     The Company is subject to various investigations, claims and legal
proceedings covering a wide range of matters that arise in the ordinary course
of its business activities. Each of these matters is subject to various
uncertainties, and it is possible that some of these matters may be resolved
unfavorably to the Company. The Company has established accruals for matters
that are probable and reasonably estimable. Management believes that any
liability that may ultimately result from the resolution of these matters in
excess of amounts provided will not have a material adverse effect on the
financial position or results of operations of the Company.
 
14.  INTERIM FINANCIAL STATEMENTS (UNAUDITED):
 
     1. BASIS OF PRESENTATION
 
          The financial statements of NuTone Inc. and Subsidiary ("the Company")
     have been prepared in connection with the proposed sale of the capital
     stock of the Company by its ultimate parent company, Williams plc
     ("Williams" or the "Parent"), a U.K. Company, to Nortek, Inc., pursuant to
     an agreement dated March 9, 1998.
 
          The consolidated financial statements include the accounts of NuTone
     Inc. (U.S.) and its wholly owned subsidiary, NuTone Canada Inc. All
     information in the accompanying footnotes is presented in thousands.
 
          Certain properties, while historically part of the Company, have been
     excluded from these financial statements, as the related assets,
     liabilities and costs will not be a part of the proposed transaction. These
     properties, at July 4, 1998 and December 31, 1997, are non-operating and
     are not material to the Company's financial position or 1998 and 1997
     results of operations.
 
   
          The consolidated financial statements of NuTone Inc. and Subsidiary
     have been prepared pursuant to the rules and regulations of the Securities
     and Exchange Commission (SEC) and, in the opinion of Management, include
     all adjustments necessary for a fair presentation of the results of
     operations, financial position and cash flows for each period shown except
     for the effects of not utilizing push down accounting related to the
     Company's acquisition by the parent company in 1991. Following the proposed
     acquisition of the Company by Nortek, Inc., a new basis of accounting will
     be established for the Company and any such pushdown adjustments with
     respect to goodwill, inventory and property, plant and equipment will be
     eliminated. All adjustments are of a normal and recurring nature. Certain
     information and footnote disclosures normally included in financial
     statements prepared in accordance with generally accepted accounting
     principles have been condensed or omitted pursuant to SEC rules and
     regulations. It is suggested that these financial statements be read in
     conjunction with the consolidated year end
    
 
                                      F-41
<PAGE>   155
                           NUTONE INC. AND SUBSIDIARY
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
     financial statements and notes thereto included in the Company's Report on
     Audit of Consolidated Financial Statements as of December 31, 1997 and for
     the year then ended.
 
     2. RECENTLY ISSUED ACCOUNTING STANDARDS
 
          The Company has adopted Statement of Financial Accounting Standards
     No. 130, "Reporting Comprehensive Income" (SFAS 130), in the first quarter
     of 1998. SFAS 130 establishes standards for reporting and displaying
     comprehensive income and its components in a full set of financial
     statements. The objective of SFAS 130 is to report a measure of all changes
     in the equity of an enterprise that result from transactions and other
     economic events of the period other than transactions with shareowners.
 
          The Financial Accounting Standards Board issued Statements of
     Financial Standards No. 131, "Disclosure about Segments of an Enterprise
     and Related Information", and No. 132, "Employers' Disclosures about
     Pensions and Other Postretirement Benefits". The Company has not yet
     determined what effect, if any, these statements will have.
 
                                      F-42
<PAGE>   156
 
     NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
REPRESENTATIONS NOT IN THIS PROSPECTUS, AND, IF GIVEN OR MADE, SUCH INFORMATION
OR REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE
COMPANY OR THE INITIAL PURCHASERS. THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFER
TO SELL, OR A SOLICITATION OF AN OFFER TO BUY, ANY SECURITIES OTHER THAN THE
NOTES OFFERED HEREBY, NOR DOES IT CONSTITUTE AN OFFER TO SELL OR A SOLICITATION
OF AN OFFER TO BUY ANY OF THE NOTES TO ANYONE OR BY ANYONE IN ANY JURISDICTION
WHERE, OR TO ANY PERSON TO WHOM, IT WOULD BE UNLAWFUL TO MAKE SUCH AN OFFER OR
SOLICITATION. NEITHER THE DELIVERY OF THIS PROSPECTUS NOR ANY SALE MADE
HEREUNDER SHALL, UNDER ANY CIRCUMSTANCES, CREATE AN IMPLICATION THAT THERE HAS
NOT BEEN A CHANGE IN THE INFORMATION SET FORTH IN THIS PROSPECTUS OR IN THE
AFFAIRS OF THE COMPANY SINCE THE DATE HEREOF.
 
                             ---------------------
 
                               TABLE OF CONTENTS
 
   
<TABLE>
<CAPTION>
                                      PAGE
                                      ----
<S>                                   <C>
Incorporation of Certain Documents
  By Reference......................     3
Available Information...............     4
Summary.............................     5
Risk Factors........................    22
The Acquisition.....................    28
Recent Developments.................    29
Use of Proceeds.....................    31
Capitalization......................    31
Unaudited Pro Forma and Pro Forma
  Adjusted Condensed Consolidated
  Financial Data....................    32
Selected Historical Consolidated
  Financial Data....................    41
Management's Discussion and Analysis
  of Financial Condition and Results
  of Operations.....................    43
Business............................    59
Management..........................    70
Description of Notes................    71
The Exchange Offer..................    98
Description of Other Obligations....   107
Material Federal Tax
  Considerations....................   109
Plan of Distribution................   111
Legal Matters.......................   112
Experts.............................   112
Index to Consolidated Financial
  Statements........................   F-1
</TABLE>
    
 
                                  NORTEK, INC.
 
                                 EXCHANGE OFFER
                                  $210,000,000
 
                          8 7/8% SERIES B SENIOR NOTES
                                    DUE 2008
 
                              --------------------
                                   PROSPECTUS
                              --------------------
                               FEBRUARY [ ], 1999
<PAGE>   157
 
                                    PART II
 
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 20.  INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
     Section 145 of the Delaware General Corporation Law ("DGCL") provides that
a corporation may indemnify any person who was or is a party or is threatened to
be made a party to any threatened, pending or completed action, suit or
proceeding whether civil, criminal or investigative (other than an action by or
in the right of the corporation) by reason of the fact that he is or was a
director, officer, employee or agent of the corporation, or is or was serving at
the request of the corporation as a director, officer, employee or agent of
another corporation, partnership, joint venture, trust or other enterprise,
against expenses (including attorneys' fees), judgments, fines and amounts paid
in settlement actually and reasonably incurred by him in connection with such
action, suit or proceeding if he acted in good faith and in a manner he
reasonably believed to be in or not opposed to the best interests of the
corporation, and, with respect to any criminal action or proceeding, had no
reasonable cause to believe his conduct was unlawful. Section 145 further
provides that a corporation similarly may indemnify any such person serving in
any such capacity who was or is a party or is threatened to be made a party to
any threatened, pending or completed action or suit by or in the right of the
corporation to procure a judgment in its favor, against expenses actually and
reasonably incurred in connection with the defense or settlement of such action
or suit if he acted in good faith and in a manner he reasonably believed to be
in or not opposed to the best interests of the corporation and except that no
indemnification shall be made in respect of any claim, issue or matter as to
which such person shall have been adjudged to be liable to the corporation
unless and only to the extent that the Delaware Court of Chancery or such other
court in which such action or suit was brought shall determine upon application
that, despite the adjudication of liability but in view of all the circumstances
of the case, such person is fairly and reasonably entitled to indemnity for such
expenses which the Court of Chancery or such other court shall deem proper.
 
     Section 102(b)(7) of the DGCL permits a corporation to include in its
certificate of incorporation a provision eliminating or limiting the personal
liability of a director to the corporation or its stockholders for monetary
damages for breach of fiduciary duty as a director, provided that such provision
shall not eliminate or limit the liability of a director (i) for any breach of
the director's duty of loyalty to the corporation or its stockholders, (ii) for
acts or omissions not in good faith or which involve intentional misconduct or a
knowing violation of law, (iii) under Section 174 of the DGCL (relating to
unlawful payment of dividends and unlawful stock purchase and redemption) or
(iv) for any transaction from which the director derived an improper personal
benefit.
 
     The Company's Certificate of Incorporation provides that its Directors
shall not be liable to the Registrant or its stockholders for monetary damages
for breach of fiduciary duty as a director except to the extent that exculpation
from liabilities is not permitted under the DGCL as in effect at the time such
liability is determined. The Company's By-Laws further provide that Registrant
shall indemnify its directors and officers to the fullest extent permitted by
the DGCL.
 
     The directors and officers of the Company are covered under directors' and
officers' liability insurance policies maintained by the Company.
 
                                      II-1
<PAGE>   158
 
ITEM 21. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES
 
     (a) EXHIBITS
 
<TABLE>
<CAPTION>
EXHIBIT
NUMBER                           DESCRIPTION
- -------                          -----------
<C>      <S>
 1*      Purchase Agreement dated July 27, 1998 regarding the
         issuance and sale of the Notes among Nortek, Inc.,
         Wasserstein Perella Securities, Inc., Bear Stearns & Co.
         Inc. and PaineWebber Incorporated.
 2.2     Stock Purchase and Sale Agreement dated March 9, 1998,
         between Williams Y&N Holdings, Inc. and NTK Sub, Inc.
         (incorporated by reference to Exhibit 2 to Form 8-K/A filed
         March 18, 1998, File No. 1-6112).
 2.3     Amendments No. 1 through No. 9 to Stock Purchase and Sale
         Agreement dated March 9, 1998, between Williams Y&N
         Holdings, Inc. and NTK Sub, Inc. (Exhibit 2.2 to Form 8-K
         filed on July 31, 1998, File No. 1-6112).
 3.1     Restated Certificate of Incorporation of Nortek, Inc.
         (Exhibit 2 to Form 8-K filed April 23, 1987, File No.
         1-6112).
 3.2     Amendment to Restated Certificate of Incorporation of
         Nortek, Inc. effective May 10, 1989 (Exhibit 3.2 to Form
         10-K filed March 30, 1990, File No. 1-6112).
 3.3     By-laws of Nortek, Inc. (as amended through September 19,
         1996) (Exhibit 3.3 to Form 10-Q filed November 5, 1996, File
         No. 1-6112).
 4.1*    Indenture dated as of July 31, 1998 between Nortek, Inc. and
         State Street Bank and Trust Company, as Trustee.
 4.2*    Registration Rights Agreement dated as of July 31, 1998
         between Nortek, Inc. and the Initial Purchasers.
 5.1     Opinion of Ropes & Gray regarding the validity of the Series
         B Senior Notes due 2008.
 5.2     Opinion of Paul, Hastings, Janofsky & Walker LLP regarding
         the validity of the Series B Senior Notes due 2008.
12       Schedule regarding computation of ratio of earnings to fixed
         charges.
23.1     Consent of Arthur Andersen LLP.
23.2     Consent of PricewaterhouseCoopers LLP.
23.3     Consent of Grant Thornton LLP.
23.4     Consent of Ropes & Gray (included in Exhibit 5.1).
23.5     Consent of Paul, Hastings, Janofsky & Walker LLP (included
         in Exhibit 5.2).
24       Powers of Attorney (included on signature page hereto).
25*      Statement of Eligibility of Trustee.
99.1*    Form of Letter of Transmittal used in connection with the
         Exchange Offer.
99.2*    Form of Notice of Guaranteed Delivery used in connection
         with the Exchange Offer.
</TABLE>
 
- ---------------
* Previously Filed.
 
ITEM 22.  UNDERTAKINGS
 
     Insofar as indemnification for liabilities arising under the Securities Act
of 1933 may be permitted to directors, officers and controlling persons of the
Registrant, pursuant to the foregoing provisions, or otherwise, the Registrant
has been advised that in the opinion of the Securities and Exchange Commission
such indemnification is against public policy as expressed in the Securities Act
of 1933 and is, therefore, unenforceable. In the event that a claim for
indemnification against such liabilities (other than the payment by the
Registrant of expenses incurred or paid by a director, officer of controlling
person of the Registrant in the successful defense of any action, suit or
proceeding) is asserted by any such director, officer or controlling person in
connection with the securities being registered, the Registrant will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit to a court of appropriate jurisdiction the question of whether or not
such indemnification is against public policy as expressed in the Securities Act
of 1933 and will be governed by the final adjudication of such issue.
 
                                      II-2
<PAGE>   159
 
     The undersigned registrant hereby undertakes to supply by means of a
post-effective amendment all information concerning a transaction, and the
company being acquired involved therein, that was not the subject of and
included in the registration statement when it became effective.
 
     The undersigned registrant hereby undertakes to respond to requests for
information that is incorporated by reference into the prospectus pursuant to
Item 4, (10)(b), 11 or 13 of this form, within one business day of receipt of
such request, and to send the incorporated documents by first class mail or
other equally prompt means. This includes information contained in documents
filed subsequent to the effective date of the registration statement through the
date of responding to the request.
 
     The undersigned registrant hereby undertakes:
 
     (1) To file, during any period in which offers or sales are being made, a
post-effective amendment to this registration statement:
 
          (i) To include any prospectus required by Section 10(a)(3) of the
     Securities Act of 1933;
 
          (ii) To reflect in the prospectus any facts or events arising after
     the effective date of the registration statement (or the most recent
     post-effective amendment thereof) which, individually or in the aggregate,
     represent a fundamental change in the information set forth in the
     registration statement. Notwithstanding the foregoing, any increase or
     decrease in volume of securities offered (if the total dollar value of
     securities offered would not exceed that which was registered) and any
     deviation from the low or high and of the estimated maximum offering range
     may be reflected in the form of prospectus filed with the Commission
     pursuant to Rule 424(b) if, in the aggregate, the changes in volume and
     price represent no more than 20 percent change in the maximum aggregate
     offering price set forth in the "Calculation of Registration Fee" table in
     the effective registration statement.
 
          (iii) To include any material information with respect to the plan of
     distribution not previously disclosed in the registration statement or any
     material change to such information in the registration statement.
 
     (2) That, for the purpose of determining any liability under the Securities
Act of 1933, each such post-effective amendment shall be deemed to be a new
registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.
 
     (3) To remove from registration by means of a post-effective amendment any
of the securities being registered which remain unsold at the termination of the
offering.
 
     The undersigned registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act of 1933, each filing of the
registrant's annual report pursuant to Section 13(a) or 15(d) of the Securities
Exchange Act (and, where applicable, each filing of an employee benefit plan's
annual report pursuant to Section 15(d) of the Securities Exchange Act of 1934)
that is incorporated by reference in the registration statement shall be deemed
to be a new registration statement relating to the securities offered therein,
and the offering of such securities at that time shall be deemed to be the
initial bona fide offering thereof.
 
                                      II-3
<PAGE>   160
 
                                   SIGNATURES
 
   
     Pursuant to the requirements of the Securities Act, the registrant has duly
caused this registration statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the City of Providence, State of
Rhode Island, on the 12th day of February, 1999.
    
 
                                            NORTEK, INC.
 
                                            BY: /s/ RICHARD L. BREADY
                                                ................................
                                              NAME: RICHARD L. BREADY
                                              TITLE: CHAIRMAN, PRESIDENT AND
                                                 CHIEF EXECUTIVE OFFICER
 
                               POWER OF ATTORNEY
 
     Pursuant to the requirements of the Securities Act of 1933, this
registration statement has been signed by the following persons in the
capacities and on the dates indicated. Each person whose signature appears below
hereby authorizes Richard L. Bready, Almon C. Hall and Kevin W. Donnelly or any
of them, severally, with full power of substitution, to execute in the name and
on behalf of such person any amendment (including any post-effective amendment)
to this Registration Statement (or any other registration statement for the same
offering that is to be effective upon filing pursuant to Rule 462(b) under the
Securities Act) and to file the same, with exhibits thereto, and other documents
in connection therewith, making such changes in this Registration Statement as
the person(s) so acting deems appropriate, and appoints each of such persons,
each with full power of substitution, attorney-in-fact to sign any amendment
(including any post-effective amendment to this Registration Statement (or any
other registration statement for the same offering that is to be effective upon
filing pursuant to Rule 462(b) under the Securities Act) and to file the same,
with exhibits thereto, and other documents in connection therein.
 
   
<TABLE>
<CAPTION>
                     SIGNATURE                                    TITLE                     DATE
                     ---------                                    -----                     ----
<C>                                                  <S>                              <C>
            *By: /s/ RICHARD L. BREADY               (Principal Executive Officer)    February 12, 1999
       ............................. .......         Chairman, President and Chief
                 RICHARD L. BREADY                   Executive Officer
                 ATTORNEY-IN-FACT
 
                         *                           (Principal Accounting Officer)
     ........................................        Vice President, Controller and
                   ALMON C. HALL                     Chief Accounting Officer
 
                         *                           Vice President, Treasurer and
     ........................................        Director (Principal Financial
                 RICHARD J. HARRIS                   Officer)
 
                         *                           Director
     ........................................
                 PHILLIP L. COHEN
 
                         *                           Director
     ........................................
                 WILLIAM I. KELLY
 
                         *                           Director
     ........................................
                  J. PETER LYONS
</TABLE>
    
 
                                      II-4
<PAGE>   161
 
                                 EXHIBIT INDEX
 
<TABLE>
<CAPTION>
                                                                        SEQUENTIALLY
EXHIBIT                                                                   NUMBERED
NUMBER                            DESCRIPTION                              PAGES
- -------                           -----------                           ------------
<S>       <C>                                                           <C>
 1*       Purchase Agreement dated July 27, 1998 regarding the
          issuance and sale of the Notes among Nortek, Inc.,
          Wasserstein Perella Securities, Inc., Bear Stearns & Co.
          Inc. and PaineWebber Incorporated.
 2.2      Stock Purchase and Sale Agreement dated March 9, 1998,
          between Williams Y&N Holdings, Inc., and NTK Sub, Inc.
          (incorporated by reference to Exhibit 2 to Form 8-K/A filed
          March 18, 1998, File No. 1-6112).
 2.3      Amendments No. 1 through No. 9 to Stock Purchase and Sale
          Agreement dated March 9, 1998, between Williams Y&N
          Holdings, Inc., and NTK Sub, Inc. (Exhibit 2.2 to Form 8-K
          filed on July 31, 1998, File No. 1-6112).
 3.1      Restated Certificate of Incorporation of Nortek, Inc.
          (Exhibit 2 to Form 8-K filed April 23, 1987, File No.
          1-6112).
 3.2      Amendment to Restated Certificate of Incorporation of
          Nortek, Inc. effective May 10, 1989 (Exhibit 3.2 to Form
          10-K filed March 30, 1990, File No. 1-6112).
 3.3      By-laws of Nortek, Inc. (as amended through September 19,
          1996) (Exhibit 3.3 to Form 10-Q filed November 5, 1996, File
          No. 1-6112).
 4.1*     Indenture dated as of July 31, 1998 between Nortek, Inc. and
          State Street Bank and Trust Company, as Trustee.
 4.2*     Registration Rights Agreement dated as of July 31, 1998
          between Nortek, Inc. and the Initial Purchasers.
 5.1      Opinion of Ropes & Gray regarding the validity of the Series
          B Senior Notes due 2008.
 5.2      Opinion of Paul, Hastings, Janofsky & Walker LLP regarding
          the validity of the Series B Senior Notes due 2008.
12        Schedule regarding computation of ratio of earnings to fixed
          charges.
23.1      Consent of Arthur Andersen LLP.
23.2      Consent of PricewaterhouseCoopers LLP.
23.3      Consent of Grant Thornton LLP.
23.4      Consent of Ropes & Gray (included in Exhibit 5.1).
23.5      Consent of Paul, Hastings, Janofsky & Walker LLP (included
          in Exhibit 5.2).
24        Powers of Attorney (included on signature page hereto).
25*       Statement of Eligibility of Trustee.
99.1*     Form of Letter of Transmittal used in connection with the
          Exchange Offer.
99.2*     Form of Notice of Guaranteed Delivery used in connection
          with the Exchange Offer.
</TABLE>
 
- ---------------
* Previously Filed.

<PAGE>   1

                                                            Exhibit 5.1



                                                               February 12, 1999



Nortek, Inc.
50 Kennedy Plaza
Providence, RI 02903

Ladies and Gentlemen:


         This opinion is rendered to you in connection with the exchange offer
(the "Exchange Offer") by Nortek, Inc. ("Nortek") to exchange its $210,000,000 8
7/8% Series B Notes due 2008 (the "Exchange Notes") for its outstanding
$210,000,000 8 7/8% Series A Notes due 2008 (the "Original Notes"). The Original
Notes were issued pursuant to the provisions of an indenture dated as of July
31, 1998 (the "Indenture") entered into between Nortek and State Street Bank and
Trust Company, a national banking association, as Trustee (the "Trustee").

         We have acted as special counsel for Nortek in connection with the
Exchange Offer. For purposes of this opinion, we have examined and relied upon
the information set forth in Amendment No. 2 to the registration statement (the
"Registration Statement") on Form S-4 filed February 10, 1999 with the
Securities and Exchange Commission under the Securities Act of 1933, as amended
(the "Act"), relating to the Exchange Offer, the registration rights agreement
(the "Registration Rights Agreement") entered into between the Company and
Wasserstein Perella Securities, Inc. and Bear, Stearns & Co., Inc.
(collectively, the "Initial Purchasers") and such other documents and records as
we have deemed necessary. We express no opinion as to the laws of any
jurisdiction other than those of The Commonwealth of Massachusetts, the General
Corporation Law of the State of Delaware and the federal laws of the United
States of America.



<PAGE>   2


Nortek, Inc.                            -2-                    February 12, 1999




         Based upon the foregoing, we are of the opinion that (i) Nortek is a
corporation duly organized, validly existing, and in good standing under the
laws of the State of Delaware, (ii) Nortek has duly authorized, executed and
delivered the Indenture and has duly authorized the Exchange Notes as provided
in the Indenture, and when executed and delivered in exchange for the Original
Notes and (iii) Nortek has all requisite corporate power and authority to
execute and deliver the Indenture and the Exchange Notes, and to perform its
obligations thereunder.


         We understand that this opinion is to be used in connection with the
Registration Statement. We hereby consent to the filing of this opinion as part
of the Registration Statement and to the use of our name in each related
prospectus under the caption "Legal Matters" or under a similar caption.


                                            Very truly yours,



                                            Ropes & Gray


<PAGE>   1
                                                                  Exhibit 5.2




                                            February 8, 1999







Nortek, Inc.
50 Kennedy Plaza
Providence, RI 02903



         Re:      Nortek, Inc.
                  $210,000,000 8 7/8% Senior Notes due 2008
                  -----------------------------------------

Ladies and Gentlemen:

     This opinion is furnished to you in connection with the exchange offer (the
"Exchange Offer") by Nortek, Inc. (the "Company") to exchange its $210,000,000
8-7/8% Series B Notes due 2008 (the "Exchange Notes") for outstanding
$210,000,000 8-7/8% Series A Notes due 2008 (the "Original Notes"). The Original
Notes were issued, and the Exchange Notes are to be issued, pursuant to the
provisions of an indenture dated as of July 31, 1998 (the "Indenture"), between
the Company and State Street Bank and Trust Company, as trustee (the "Trustee").

     In rendering our opinion, we have examined an executed copy of the
Indenture. We have not examined any other documents. We have also reviewed such
questions of law as we have considered necessary and appropriate for the
purposes of this opinion. We have assumed that the Company is a corporation duly
organized, validly existing and in good


<PAGE>   2

standing under the laws of the State of Delaware, that the Company has all
requisite corporate power and authority to execute, deliver and perform its
obligations under the Indenture and the Exchange Notes, that the Indenture has
been duly authorized, executed and delivered by both the Company and the
Trustee, and that payment for the Original Notes issued under the Indenture was
made and received by the Company.


     Based on the foregoing, we are of the opinion that (i) the Indenture is a
legal, valid and binding agreement of the Company, and (ii) the Exchange Notes,
when executed and delivered by the Company and duly authenticated by the
Trustee, will be the legal, valid and binding obligations of the Company,
enforceable against it in accordance with their respective terms, except that
(a) the enforceability thereof may be subject to bankruptcy, insolvency,
reorganization, moratorium, fraudulent conveyance or other laws now or hereafter
in effect relating to creditors' rights generally, (b) the remedy of specific
performance and injunctive and other forms of equitable relief may be subject to
equitable defenses and to the discretion of the court before which any
proceedings therefor may be brought, and (c) that the enforceability of
provisions imposing liquidated damages, penalties or an increase in interest
rate upon the occurrence of a default may be limited in certain circumstances.


     In connection with the offering of the Original Notes and certain other
securities offerings by the Company, we represented the initial purchasers of
those securities.

     The opinion expressed above is limited to the laws of the State of New
York. We understand that this opinion is to be used in connection with the
Company's registration statement on Form S-4 (the "Registration Statement") with
the Securities and Exchange Commission under the Securities Act of 1933, as
amended, relating the Exchange Offer. We hereby consent to the filing of this
opinion as part of the Registration Statement and to the use of our name, solely
for purposes of identifying us in the capacity contemplated by this letter, in
each related prospectus under the caption "Legal Matters" or under a similar
caption.

                                               Very truly yours,


                                               Paul, Hastings, Janofsky &
                                                       Walker LLP


<PAGE>   1
                                                                      EXHIBIT 12

Nortek, Inc.
Calculation of Earnings to Fixed Charges
(Amounts in Millions)

   
<TABLE>
<CAPTION>
                                                                                                       Nine Months Ended
                                                                                                   -------------------------
                                                                                                   September 27,  October 3,
                                                     1993    1994     1995      1996      1997         1997         1998
<S>                                                 <C>      <C>      <C>       <C>       <C>         <C>        <C>
Earnings (Loss) from Continuing Operations          (10.2)   15.4     17.5      23.7      26.4         20.8        23.1
Provision for Income Taxes                            2.2     8.7     10.6      14.9      16.3         11.4        19.4
                                                   -------------------------------------------------------------------------
"Earnings"                                           (8.0)   24.1     28.1      38.6      42.7         32.2        42.5
                                                   =========================================================================
Fixed Charges:
      Interest Expense including amortization of
      Debt Expense and Discount                      24.2    23.8     23.0      28.4      50.2         31.1        62.1

      Interest portion of Rental Expense              1.8     1.9      1.9       1.8       2.5          1.9         4.1
                                                     ----    ----     ----      ----      ----         ----       -----     
      "Fixed Charges"                                26.0    25.7     24.9      30.2      52.7         33.0        66.2
                                                     ====    ====     ====      ====      ====         ====       =====

      Earnings Available for Fixed Charges           18.0    49.8     53.0      68.8      95.4         65.2       108.7 

      Ratio of Earnings to Fixed Charges               --     1.9      2.1       2.3       1.8          2.0         1.6
</TABLE>
    


   
<TABLE>
<CAPTION>
                                                     Year Ended December 31, 1997             Nine Months Ended October 3, 1998
                                                --------------------------------------    ----------------------------------------
                                                   Pro Forma                                            
                                                    Nortek                                                              
                                                    And Ply       NuTone     Pro Forma        Nortek          NuTone      Pro Forma
                                                      Gem        Historical   Company       Historical      Historical     Company
<S>                                             <C>              <C>         <C>          <C>              <C>          <C>   
Earnings from Continuing Operations                   8.2           7.9         5.9            23.1            3.2         19.6
Provision for Income Taxes                            8.8           5.0        12.4            19.4            2.1         20.4
                                                    -----         -----       -----            ----           ----         ----
"Earnings"                                           17.0          12.9        18.3            42.5            5.3         40.0
                                                    =====         =====       =====            ====           ====         ====
Fixed Charges:
      Interest Expense including amortization of
      Debt Expense and Discount                      77.8          11.9        97.1            62.1            7.1         73.4

      Interest portion of Rental Expense              5.0            .4         5.4             4.1             .3          4.4
                                                    -----         -----       -----            ----           ----         ----
      "Fixed Charges"                                82.8          12.3       102.5            66.2            7.4         77.8
                                                    =====         =====       =====           =====          =====        =====

Earnings Available for Fixed Charges                 99.8          25.2       120.8           108.7           12.7        117.8
 Ratio of Earnings to Fixed Charges                   1.2           2.0         1.2             1.6            1.7          1.5
</TABLE>
    


   
<TABLE>       
<CAPTION>
                                                         Nine Months Ended September 27, 1997
                                                      ----------------------------------------

                                                         Pro Forma                             
                                                         Nortek and       NuTone      Pro Forma      
                                                          Ply Gem       Historical     Company
<S>                                                   <C>               <C>          <C>
Earnings from Continuing Operations                          2.6           4.9           0.6
Provision (Benefit) for Income Taxes                         3.9           3.3           6.7
                                                           -----         -----         -----
"Earnings"                                                   6.5           8.2           7.3
                                                           =====         =====         =====
Fixed Charges:
      Interest Expense including amortization of
      Debt Expense and Discount                             58.7           9.0          73.2

      Interest portion of Rental Expense                     4.4            .3           4.7
                                                           -----         -----         -----
      "Fixed Charges"                                       63.1           9.3          77.9
                                                           =====         =====         =====

      Earnings Available for Fixed Charges                  69.6          17.5          85.2

      Ratio of Earnings to Fixed Charges                     1.1           1.9           1.1

</TABLE>
    

<PAGE>   1
 
                                                                    EXHIBIT 23.1
 
                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
To Nortek, Inc.:
 
     As independent public accountants, we hereby consent to the use of our
report dated March 9, 1998 included in or made part of this Registration
Statement and to all references to our Firm included in this Registration
Statement.
 
                                          /s/  ARTHUR ANDERSEN LLP
 
Boston, Massachusetts
   
February 8, 1999
    

<PAGE>   1
 
                                                                    EXHIBIT 23.2
 
                       CONSENT OF INDEPENDENT ACCOUNTANTS
 
   
     We consent to the inclusion in this Amendment No. 2 to the registration
statement on Form S-4 (File No. 333-64731), of our report, which includes an
explanatory paragraph disclosing the Company has not utilized push down
accounting in accordance with generally accepted accounting principles, as
established by the Securities and Exchange Commission for public companies,
dated February 20, 1998, on our audit of the consolidated financial statements
of NuTone Inc. and Subsidiary. We also consent to the reference to our Firm
under the caption "Experts".
    
 
/s/  PRICEWATERHOUSECOOPERS LLP
 
Cincinnati, Ohio
   
February 8, 1999
    

<PAGE>   1
 
                                                                    EXHIBIT 23.3
 
              CONSENT OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS
 
     We have issued our report dated February 25, 1997 accompanying the
consolidated financial statements of Ply Gem Industries, Inc. (the "Company")
and subsidiaries for the year ended December 31, 1996 incorporated by reference
to this Registration Statement. We hereby consent to the incorporation of our
report incorporated by reference to this Form S-4 and to the use of our name as
it appears under the caption "Experts."
 
/s/  GRANT THORNTON LLP
 
New York, New York
   
February 8, 1999
    


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