CECO ENVIRONMENTAL CORP
SC 13D, 1997-06-17
INDUSTRIAL & COMMERCIAL FANS & BLOWERS & AIR PURIFING EQUIP
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<PAGE>

                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                  SCHEDULE 13D

                    UNDER THE SECURITIES EXCHANGE ACT OF 1934
                               (AMENDMENT NO. 14)*

                               CECO Filters, Inc.
- --------------------------------------------------------------------------------
                                (Name of Issuer)

                                  Common Stock
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                   150-034-106
                    ----------------------------------------
                                 (CUSIP Number)
                                Phillip DeZwirek
                         111 Elizabeth Street, 6th Floor
                         Toronto, Ontario CANADA M5G 1P7
 ------------------------------------------------------------------------------
   (Name, Address and Telephone Number of Person Authorized to Receive Notices
                               and Communications)

                                  June 12, 1997
          ------------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisitions which is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box / /.

Check the following box if a fee is being paid with the statement / /. (A fee is
not required only if the reporting person: (1) has a previous statement on file
reporting beneficial ownership of more than five percent of the class of
securities described in Item 1; and (2) has filed no amendment subsequent
thereto reporting beneficial ownership of five percent of less of such class.)
(See Rule 13d-7.)

NOTE: Six copies of this statement, including all exhibits, should be filed with
the Commission. See Rule 13d-1(a) for other parties to whom copies are to be
sent.

*The Remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the act (however, see the
Notes).


<PAGE>



                                  SCHEDULE 13D

CUSIP NO. 150-034-106                                  PAGE  2   OF  13  PAGES
         -------------                                      ---     ----      
================================================================================
1        NAME OF REPORTING PERSON
         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                  CECO Environmental Corp.
- --------------------------------------------------------------------------------
2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP              (a)  / /
                                                                       (b)  / /

- --------------------------------------------------------------------------------
3        SEC USE ONLY

- --------------------------------------------------------------------------------
4        SOURCE OF FUNDS*


- --------------------------------------------------------------------------------
5        CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDING IS REQUIRED            / /
         PURSUANT TO ITEMS 2(d) OR 2(E)

- --------------------------------------------------------------------------------
6        CITIZENSHIP OR PLACE OR ORGANIZATION



- --------------------------------------------------------------------------------
 NUMBER OF                          7       SOLE VOTING POWER
  SHARES
BENEFICIALLY                                4,827,730
 OWNED BY                           --------------------------------------------
   EACH                             8       SHARED VOTING POWER
 REPORTING
PERSON WITH
                                    --------------------------------------------
                                    9       SOLE DISPOSITIVE POWER

                                            4,827,730
                                    --------------------------------------------
                                    10      SHARED DISPOSITIVE POWER


- --------------------------------------------------------------------------------
11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                    4,827,730 shares
- --------------------------------------------------------------------------------
12       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11)                      / /
         EXCLUDES CERTAIN SHARES


- --------------------------------------------------------------------------------
13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                  70.30%
- --------------------------------------------------------------------------------
14       TYPE OF REPORTING PERSON

                  CO
- --------------------------------------------------------------------------------



<PAGE>



                                  SCHEDULE 13D

CUSIP NO. 150-034-106                                  PAGE  3   OF  13  PAGES
         -------------                                      ---     ----
            
================================================================================

- --------------------------------------------------------------------------------
         NAME OF REPORTING PERSON
         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                  Icarus Investment Corp.
- --------------------------------------------------------------------------------
2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP              (a)  / /
                                                                       (b)  / /

- --------------------------------------------------------------------------------
3        SEC USE ONLY

- --------------------------------------------------------------------------------
4        SOURCE OF FUNDS*


- --------------------------------------------------------------------------------
5        CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDING IS REQUIRED            / /
         PURSUANT TO ITEMS 2(d) OR 2(E)

- --------------------------------------------------------------------------------
6        CITIZENSHIP OR PLACE OR ORGANIZATION



- --------------------------------------------------------------------------------
 NUMBER OF                          7       SOLE VOTING POWER
  SHARES
BENEFICIALLY
 OWNED BY                           --------------------------------------------
   EACH                             8       SHARED VOTING POWER
 REPORTING
PERSON WITH                                 4,827,730
                                    --------------------------------------------
                                    9       SOLE DISPOSITIVE POWER


                                    --------------------------------------------
                                    10      SHARED DISPOSITIVE POWER

                                            4,827,730
- --------------------------------------------------------------------------------
11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                    4,827,730 shares
- --------------------------------------------------------------------------------
12       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11)                      / /
         EXCLUDES CERTAIN SHARES


- --------------------------------------------------------------------------------
13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                  70.30%
- --------------------------------------------------------------------------------
14       TYPE OF REPORTING PERSON

                  CO


<PAGE>



                                  SCHEDULE 13D

CUSIP NO. 150-034-106                                 PAGE  4   OF  13  PAGES
         -------------                                     ---     ----      
================================================================================

- --------------------------------------------------------------------------------
1        NAME OF REPORTING PERSON
         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                  Phillip DeZwirek
- --------------------------------------------------------------------------------
2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP              (a)  / /
                                                                       (b)  / /

- --------------------------------------------------------------------------------
3        SEC USE ONLY

- --------------------------------------------------------------------------------
4        SOURCE OF FUNDS*


- --------------------------------------------------------------------------------
5        CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDING IS REQUIRED            / /
         PURSUANT TO ITEMS 2(d) OR 2(E)

- --------------------------------------------------------------------------------
6        CITIZENSHIP OR PLACE OR ORGANIZATION



- --------------------------------------------------------------------------------
 NUMBER OF                          7       SOLE VOTING POWER
  SHARES
BENEFICIALLY
 OWNED BY                           --------------------------------------------
   EACH                             8       SHARED VOTING POWER
 REPORTING
PERSON WITH                                 4,827,730
                                    --------------------------------------------
                                    9       SOLE DISPOSITIVE POWER


                                    --------------------------------------------
                                    10      SHARED DISPOSITIVE POWER

                                            4,827,730
- --------------------------------------------------------------------------------
11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                    4,827,730 shares
- --------------------------------------------------------------------------------
12       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11)                      / /
         EXCLUDES CERTAIN SHARES


- --------------------------------------------------------------------------------
13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                  70.30%
- --------------------------------------------------------------------------------
14       TYPE OF REPORTING PERSON

                  IN


<PAGE>



                                  SCHEDULE 13D

CUSIP NO. 150-034-106                                   PAGE  5   OF  13  PAGES
         -------------                                       ---     ----    
================================================================================

- --------------------------------------------------------------------------------
1        NAME OF REPORTING PERSON
         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                  Jason Louis DeZwirek
- --------------------------------------------------------------------------------
2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP              (a)  / /
                                                                       (b)  / /

- --------------------------------------------------------------------------------
3        SEC USE ONLY

- --------------------------------------------------------------------------------
4        SOURCE OF FUNDS*


- --------------------------------------------------------------------------------
5        CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDING IS REQUIRED            / /
         PURSUANT TO ITEMS 2(d) OR 2(E)

- --------------------------------------------------------------------------------
6        CITIZENSHIP OR PLACE OR ORGANIZATION



- --------------------------------------------------------------------------------
 NUMBER OF                          7       SOLE VOTING POWER
  SHARES
BENEFICIALLY
 OWNED BY                           --------------------------------------------
   EACH                             8       SHARED VOTING POWER
 REPORTING
PERSON WITH                                 4,827,730
                                    --------------------------------------------
                                    9       SOLE DISPOSITIVE POWER


                                    --------------------------------------------
                                    10      SHARED DISPOSITIVE POWER

                                            4,827,730
- --------------------------------------------------------------------------------
11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                    4,827,730 shares
- --------------------------------------------------------------------------------
12       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11)                      / /
         EXCLUDES CERTAIN SHARES


- --------------------------------------------------------------------------------
13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                  70.30%
- --------------------------------------------------------------------------------
14       TYPE OF REPORTING PERSON

                  IN


<PAGE>



                                  SCHEDULE 13D

CUSIP NO. 150-034-106                                   PAGE  6   OF  13  PAGES
         -------------                                       ---     ----
================================================================================

- --------------------------------------------------------------------------------
1        NAME OF REPORTING PERSON
         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                  IntroTech Investments, Inc.
- --------------------------------------------------------------------------------
2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP              (a)  / /
                                                                       (b)  / /

- --------------------------------------------------------------------------------
3        SEC USE ONLY

- --------------------------------------------------------------------------------
4        SOURCE OF FUNDS*


- --------------------------------------------------------------------------------
5        CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDING IS REQUIRED            / /
         PURSUANT TO ITEMS 2(d) OR 2(E)

- --------------------------------------------------------------------------------
6        CITIZENSHIP OR PLACE OR ORGANIZATION



- --------------------------------------------------------------------------------
 NUMBER OF                          7       SOLE VOTING POWER
  SHARES
BENEFICIALLY
 OWNED BY                           --------------------------------------------
   EACH                             8       SHARED VOTING POWER
 REPORTING
PERSON WITH                                 4,827,730
                                    --------------------------------------------
                                    9       SOLE DISPOSITIVE POWER


                                    --------------------------------------------
                                    10      SHARED DISPOSITIVE POWER

                                            4,827,730
- --------------------------------------------------------------------------------
11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                    4,827,730 shares
- --------------------------------------------------------------------------------
12       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11)                      / /
         EXCLUDES CERTAIN SHARES


- --------------------------------------------------------------------------------
13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                  70.30%
- --------------------------------------------------------------------------------
14       TYPE OF REPORTING PERSON

                  CO


<PAGE>




CUSIP NO. 150-034-106                                  PAGE  7   OF  13  PAGES
                                                            ---     ----

         Amendment No. 14 to a Schedule 13D, which was last amended by an
Amendment No. 13 to Schedule 13D, is filed by CECO Environmental Corp. ("CEC"),
Icarus Investment Corp. ("Icarus"), Phillip DeZwirek, Jason Louis DeZwirek and
IntroTech Investments, Inc. with respect to an event dated June 12, 1997,
relating to the common stock, par value $.001 of CECO Filters, Inc. ("CECO").
Only those items amended hereby are included herein.

Items 3-5 inclusive for CECO Environmental Corp.

Item 3.           Source and Amount of funds or Other Considerations.

         CEC acquired an additional 186,000 shares of CECO common stock in a
single private transaction with a non-U.S. person on June 12, 1997 in exchange
for 186,000 newly issued shares of common stock of CEC.

Item 4.           Purpose of the Transaction

         CEC increased its ownership of shares of CECO to maintain its position
of owning a majority of CECO's outstanding shares. CEC intends to purchase
additional shares of CECO common stock if such additional shares become
available at a price which CEC considers reasonable. Such purchases, if made,
would be made through private transactions, including exchanges of CEC common
stock for CECO common stock, or open market purchases of CECO common stock.

         CEC acquired 186,000 additional shares of CECO common stock on June 12,
1997 by exchanging CEC common stock for CECO common stock on a 1-for-1 basis
with a non-U.S. person.

Item 5.           Interest in Securities of the Issuer.

                  (a)      CEC beneficially owns 4,827,730 shares or 70.30% of
                           the outstanding common stock of CECO. CEC owns all of
                           such shares directly.

                  (b)      CEC has sole voting power and sole dispositive power
                           with respect to such 4,827,730 shares of common stock
                           of CECO.

                  (c)      On June 12, 1997, in a single private transaction
                           occurring outside the United States, CEC exchanged
                           186,000 newly issued shares of CEC common stock for
                           186,000 shares of CECO common stock from a non-U.S.
                           person at a one-to-one exchange rate.



<PAGE>



CUSIP NO. 150-034-106                                  PAGE  8   OF  13  PAGES
                                                            ---     ----

                  (d)      CEC is a publicly traded company with more than 900
                           beneficial holders of its common stock. The
                           shareholders of CEC that have the right to receive or
                           the power to direct the receipt of dividends from, or
                           the proceeds of sale of, the shares of CECO common
                           stock owned by CEC that relates to more than a 5%
                           interest in that class of securities of CECO are
                           IntroTech Investments, Inc. ("IntroTech"), Icarus
                           Investment Corp. ("Icarus") and its shareholders,
                           Phillip DeZwirek and Jason Louis DeZwirek. Icarus
                           owns 17.73% of the outstanding shares of common stock
                           of CEC. Icarus is owned 50% by Phillip DeZwirek and
                           50% by Jason Louis DeZwirek. IntroTech owns 21.25% of
                           the outstanding shares of common stock of CEC.
                           IntroTech is wholly owned by Jason Louis DeZwirek.

                  (e)      Not applicable.


Items 3-5 inclusive for Icarus Investment Corp.

Item 3.           Source and Amount of Funds or Other Considerations.

         Icarus beneficially owns 17.73% of the 4,827,730 shares of CECO owned
by CEC indirectly through Icarus' direct ownership of 17.73% of the outstanding
shares of common stock of CEC. See CEC's response to Item 3 herein.

Item 4.           Purpose of Transaction.

         Icarus acquired its shares of common stock of CECO for the same
purposes as CEC. See CEC's response to Item 4 herein.

Item 5.           Interest in Securities of the Issuer.

                  (a)      By virtue of owning 17.73% of the outstanding stock
                           of CEC, Icarus beneficially owns the 4,827,730 shares
                           of common stock of CECO owned by CEC. Icarus owns all
                           of such shares indirectly through its direct
                           ownership of common stock of CEC.

                  (b)      By virtue of owning 17.73% of the outstanding stock
                           of CEC, Icarus has shared voting power and shared
                           dispositive power with respect to the 4,827,730
                           shares of common stock of CECO owned by CEC. Such
                           powers are shared with the other shareholders of CEC.



<PAGE>



CUSIP NO. 150-034-106                                  PAGE  9   OF  13  PAGES
                                                            ---     ----

                  (c)      See CEC's response to Item 5(c) herein.

                  (d)      Icarus is controlled by Phillip DeZwirek and Jason
                           Louis DeZwirek who each owns 50% of the outstanding
                           stock of Icarus. Mr. Phillip DeZwirek and Mr. Jason
                           Louis DeZwirek each have the right to receive 50% of
                           the distributions from Icarus resulting from the
                           proceeds of dividends from, or the proceeds of sale
                           of, the shares of CECO owned by CEC.

                  (e)      Not applicable.

Items 3-5 inclusive for Phillip DeZwirek.

Item 3.           Source and Amount of Funds or Other Considerations.

         Mr. DeZwirek owns 50% of the outstanding stock of Icarus, 5,497 shares
of common stock of CEC directly and warrants to purchase 750,000 shares of
common stock of CEC. See CEC's and Icarus' responses to Item 3 herein.

Item 4.           Purpose of Transaction.

         Mr. DeZwirek acquired the shares of common stock of CECO for the same
purposes as CEC. See response of CEC to Item 4 herein.

Item 5.           Interest in Securities of the Issuer.

                  (a)      By virtue of owning 25.25% of the outstanding stock
                           of CEC (including the warrants to purchase 750,000
                           shares of common stock), Mr. DeZwirek beneficially
                           owns the 4,827,730 shares of common stock of CECO
                           owned by CEC. Mr. DeZwirek owns 16.12% of the
                           outstanding stock of CEC indirectly through his
                           direct ownership of 50% of the stock of Icarus and
                           owns 9.13% of the outstanding stock of CEC directly
                           (including as outstanding the securities underlying
                           the warrants to purchase 750,000 shares of common
                           stock).

                  (b)      Mr. DeZwirek has shared voting power and shared
                           dispositive power with respect to the 4,827,730
                           shares of common stock of CECO owned by CEC as a
                           result of his position as a director of CEC and by
                           virtue of owning 25.25% of the outstanding stock of
                           CEC (including as outstanding the securities
                           underlying the warrants to purchase 750,000 shares of
                           common stock). Mr. DeZwirek owns shares of CECO
                           indirectly through his 50% ownership of Icarus which
                           entity owns 16.12% of the


<PAGE>



CUSIP NO. 150-034-106                                 PAGE  10   OF  13  PAGES
                                                           ----     ----

                           outstanding common stock of CEC (including as
                           outstanding the shares of common stock underlying Mr.
                           DeZwirek's warrants). Mr. DeZwirek also owns shares
                           of CECO common stock indirectly through his direct
                           ownership of 9.13% of the outstanding common stock of
                           CEC (including as outstanding the securities
                           underlying the warrants to purchase 750,000 shares of
                           common stock). Mr. DeZwirek is the Chief Executive
                           Officer, Chief Financial Officer and a director of
                           CEC.

                  (c)      See CEC's response to Item 5(c) herein.

                  (d)      Mr. DeZwirek controls Icarus. He owns 50% of the
                           outstanding stock of Icarus. Mr. Jason Louis DeZwirek
                           is the only person other than Mr. Phillip DeZwirek
                           who is known to have the right to receive or the
                           power to direct the receipt of dividends from, or the
                           proceeds of the sale of, the shares of CECO owned
                           indirectly by Icarus through Icarus' direct ownership
                           of shares of common stock of CEC. Mr. Phillip
                           DeZwirek is the only person known to have the right
                           to receive or the power to direct the receipt of
                           dividends from, or the proceeds of the sale of, the
                           shares of CECO owned indirectly by him through his
                           direct ownership of shares of common stock of CEC.
                           Mr. Jason Louis DeZwirek is the adult son of Mr.
                           Phillip DeZwirek.

                  (e)      Not applicable.

Items 3-5 inclusive for Jason Louis DeZwirek.

Item 3.           Sources and Amount of Funds or Other Consideration.

         See responses of CEC, Icarus and IntroTech to Item 3 herein. Mr.
DeZwirek owns 50% of the outstanding stock of Icarus. Mr. DeZwirek is the sole
owner of IntroTech.

Item 4.           Purpose of the Transaction.

         Mr. DeZwirek acquired the shares of Common Stock of CECO for the same
purposes as CEC. See response of CEC to Item 4 herein.

Item 5.           Interest in Securities of the Issuer.

                  (a)      By virtue of owning 38.98% of the stock of CEC, Mr.
                           DeZwirek beneficially owns the 4,827,730 shares of
                           common stock of CECO


<PAGE>



CUSIP NO. 150-034-106                                  PAGE  11   OF  13  PAGES
                                                            ----     ----

                           owned by CEC. Mr. DeZwirek owns 17.73% of the
                           outstanding stock of CEC indirectly through his
                           direct ownership of 50% of the stock of Icarus. Mr.
                           DeZwirek owns an additional 21.25% of the outstanding
                           stock of CEC through his ownership of all the stock
                           of IntroTech.

                  (b)      By virtue of owning 38.98% of the stock of CEC, Mr.
                           DeZwirek has shared voting power and shared
                           dispositive power with respect to the 4,827,730
                           shares of common stock of CECO owned by CEC. This
                           power applies to all of the shares of CECO owned
                           indirectly by Mr. DeZwirek. Mr. DeZwirek owns those
                           shares indirectly through his 50% ownership of Icarus
                           which entity owns 17.73% of the outstanding common
                           stock of CEC and his ownership of IntroTech which
                           owns 21.25% of the outstanding common stock of CEC.
                           Such powers are shared with the other shareholders of
                           CEC.

                  (c)      See CEC's response to Item 5(c) herein.

                  (d)      Mr. Jason Louis DeZwirek controls Icarus. Mr. Phillip
                           DeZwirek is the only person other than Mr. Jason
                           DeZwirek who is known to have the right to receive or
                           the power to direct the receipt of dividends from, or
                           the proceeds of the sale of, the shares of CECO owned
                           indirectly by Icarus through Icarus' ownership of
                           shares of CEC. Mr. Jason Louis DeZwirek controls
                           IntroTech. No other person is known to have the right
                           to receive or the power to direct the receipt of
                           dividends from, or the proceeds of the sale of,
                           shares of CECO common stock owned indirectly by
                           IntroTech through IntroTech's ownership of shares of
                           CEC.

                  (e)      Not applicable.


Items 3-5 inclusive for IntroTech Investments, Inc.

Item 3.           Source and Amount of Funds or Other Considerations.

         IntroTech acquired 1,666,666 shares of common stock of CEC directly
from CEC in exchange for 1,666,666 shares of common stock of CECO. IntroTech
subsequently sold 68,000 shares of common stock of CEC pursuant to Rule 144. By
virtue of IntroTech owning 21.25% of CEC, IntroTech beneficially owns the
4,827,730 shares of CECO owed by CEC. See CEC's response to Item 3.



<PAGE>



CUSIP NO. 150-034-106                                 PAGE  12   OF  13  PAGES
                                                           ----     ----

Item 4.           Purpose of Transaction.

         IntroTech acquired its shares of common stock of CECO for the same
purpose as CEC. See CEC's response to Item 4 herein.

Item 5.           Interest in Securities of the Issuer.

                  (a)      By virtue of IntroTech owning 21.25% of CEC,
                           IntroTech beneficially owns the 4,827,730 shares of
                           common stock of CECO owned by CEC. IntroTech owns all
                           of such shares indirectly through its direct
                           ownership of common stock of CEC.

                  (b)      By virtue of IntroTech owning 21.25% of CEC,
                           IntroTech has shared voting power and shares
                           dispositive power with respect to the 4,827,730
                           shares of common stock of CECO owned by CEC. Such
                           powers are shared with the other the shareholders of
                           CEC.

                  (c)      See CEC's response to Item 5(c).

                  (d)      IntroTech is controlled and wholly-owned by Jason
                           Louis DeZwirek.

                  (e)      Not applicable.




<PAGE>



CUSIP NO. 150-034-106                                  PAGE  13   OF  13  PAGES
                                                            ----     ----

Signatures.

         After reasonable inquiry and to the best of our knowledge and belief,
the undersigned certify that the information set forth in this statement is
true, complete and correct.

June 16, 1997

                                            CECO ENVIRONMENTAL CORP.


                                            By:  /s/ Phillip DeZwirek
                                            -----------------------------------
                                               Phillip DeZwirek
                                               Chief Executive Officer


                                            ICARUS INVESTMENT CORP.


                                            By:  /s/ Phillip DeZwirek
                                            -----------------------------------
                                               Phillip DeZwirek
                                               Chief Executive Officer


                                                 /s/ Phillip DeZwirek
                                            -----------------------------------
                                            Phillip DeZwirek


                                                 /s/ Jason Louis DeZwirek
                                            -----------------------------------
                                            Jason Louis DeZwirek


                                            INTROTECH INVESTMENTS, INC.


                                            By:   /s/ Jason Louis DeZwirek
                                            -----------------------------------
                                               Jason Louis DeZwirek,
                                               Chief Executive Officer


                                                  /s/ Josephine Grivas
                                            -----------------------------------
                                               Josephine Grivas





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