AAON INC
8-K, 1996-10-03
AIR-COND & WARM AIR HEATG EQUIP & COMM & INDL REFRIG EQUIP
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<PAGE>
 
                      SECURITIES AND EXCHANGE COMMISSION

                               Washington, D.C.



                                   FORM 8-K

                                CURRENT REPORT


    Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934



     Date of Report (Date of earliest event reported):  September 11, 1996



                                  AAON, INC.

            (Exact name of registrant as specified in its charter)


          Nevada                33-18336-LA       87-0448736
          ------                -----------   ------------------
(State or other jurisdiction    (Commission      (IRS Employer
     of incorporation)          File Number)  Identification No.)


                    2425 South Yukon, Tulsa, Oklahoma 74107
                    ---------------------------------------
                   (Address of principal executive offices)


      Registrant's telephone number, including area code:  (918) 583-2266


<PAGE>
 
Item 5.   Other Events.
          ------------ 

          On September 11, 1996, Registrant executed the Second Restated
          Revolving Credit Loan Agreement effective July 1, 1996.


Item 7.   Financial Statements and Exhibits.
          --------------------------------- 

          (c)  A copy of the Second Restated Revolving Credit Loan Agree ment is
               filed herewith as Exhibit 1.


                                  SIGNATURES

     Pursuant to the requirements of the Securities Exchange Act of 1934, the
Registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.

                                        AAON, INC.



Date:  September 25, 1996               By: /s/ John B. Johnson, Jr.
                                            ------------------------------------
                                            John B. Johnson, Jr., Secretary

                                      -1-

<PAGE>
 
                                                                       Exhibit 1

                SECOND RESTATED REVOLVING CREDIT LOAN AGREEMENT
                            PRIME AND LIBOR PRICING


     This Revolving Credit Loan Agreement is effective as of the 1st of July,
1996, between AAON, INC., an Oklahoma corporation ("AAON") and CP/AAON, INC., a
Texas corporation (collectively "Borrowers"), and BANK OF OKLAHOMA, NATIONAL
ASSOCIATION, a national banking association ("Bank").

                                   RECITALS

     A.  Borrowers and Bank entered into a Restated Revolving Credit and Term
Loan Agreement, dated June 8, 1992, which was amended by a First Amendment dated
February 12, 1993, a Second Amendment dated May 31, 1993, a Third Amendment
dated March 31, 1994, a Fourth Amendment dated May 1, 1995, a Fifth Amendment
dated April 10, 1995, a Sixth Amendment dated April 10, 1995, and letter
agreements between Bank and Borrowers (collectively as amended the "Agreement");
and

     B.  Borrowers have requested (i) an increase and extension of the
$8,150,000.00 Revolving Credit to $12,150,000, (ii) a consolidation of the term
debt, and (iii) a release of specific collateral, all as detailed below. Subject
to the terms and conditions set forth below, Bank has agreed to the Borrowers'
request.

                                   AGREEMENT

     For valuable consideration received, it is agreed as follows:

     1.  DEFINED TERMS.  As used in this Agreement, the following terms have the
         -------------
following meanings (terms defined in the singular to have the same meaning when
used in the plural and vice versa).

         1.1.  Accounting Terms.  All accounting terms not specifically defined
               ----------------                           
herein shall be construed in accordance with GAAP consistent with those applied
in the preparation of the financial statements referred to in Section 6.9, and
all financial data submitted pursuant to this Agreement shall be prepared in
accordance with such principles.

         1.2.  "Affiliate" means any Person: (i) which directly or indirectly
                ---------                                      
controls, or is controlled by, or is under common control with, Borrowers; (ii)
which directly or indirectly beneficially owns or holds five percent (5%) or
more of any class of voting stock of Borrowers; or (iii) five percent (5%) or
more of the voting stock of which is directly or indirectly beneficially owned
or held by Borrowers. The term "control" means the possession, directly or
indirectly, of the power to direct or cause the direction of the management and
policies of a Person, whether through the ownership of voting securities, by
contract, or otherwise.
<PAGE>
 
         1.3.  "Agreement" means this Second Restated Revolving Credit Loan
                ---------                                             
Agreement, as amended, supplemented, or modified from time to time.

         1.4.  "Prime Rate" means a fluctuating interest rate per annum as in
                -----------
effect from time to time, which interest rate per annum shall at all times be
equal to the rate of interest announced publicly as Prime Rate in the Wall
Street Journal "Money Rates" section (whether or not charged in each instance).
Should the Wall Street Journal abolish or abandon the practice of announcing or
publishing a Prime Rate, then the Prime Rate shall be that interest rate or
other general reference rate then in effect, from time to time, in the
reasonable judgment of Bank, most effectively approximates the initial
definition of the "Prime Rate."

         1.5.  "Borrowing Resolutions" means certified Resolutions from the
                ---------------------
Secretary of Borrowers, in form and content as set forth on Schedule "1.5-A" and
                                                            ----------------
Schedule "1.5-B", respectively, attached hereto.
- ----------------                                

         1.6.  "Business Day" means any day other than a Saturday, Sunday, or
                ------------                            
other day on which commercial banks in Oklahoma are authorized or required to
close under the laws of the State of Oklahoma.

         1.7.  "Certificates of Good Standing" means a Certificate of Good
                -----------------------------         
Standing issued by the Secretary of State of incorporation for each of the
Borrowers and Guarantor and such other states in which Borrowers and Guarantor
do business and are required to domesticate or otherwise register, indicating
that Borrowers and Guarantor are in good standing with the laws of such
state(s).

         1.8.  "Code" means the Internal Revenue Code of 1986, as amended from
                ----                                             
time to time, and the regulations and published interpretations thereof.

         1.9.  "Collateral" means all property in which Bank is intended to have
                ----------                                     
a security interest, as described in Section 3.

         1.10. "Commitment" means the Bank's obligation to make loans to the
                ----------                             
Borrowers pursuant to this Agreement.

         1.11. "Commonly Controlled Entity" means an entity, whether or not
                --------------------------          
incorporated, which is under common control with the Borrowers within the
meaning of Section 414(b) or 414(c) of the Code.

         1.12. "Debt" means, including but not limited to: (i) indebtedness or
                ----                                  
liability for borrowed money; (ii) obligations evidenced by bonds, debentures,
notes, or other similar instruments; (iii) obligations for the deferred purchase
price of property or services (including trade obligations); (iv) obligations
under letters of credit; (v) obligations under acceptance facilities; (vi) all
guaranties, endorsements (other than for collection or deposit in the ordinary
course of business), and other contingent obligations to purchase, to provide
funds for payment, 

                                      -2-
<PAGE>
 
to supply funds to invest in any Person or entity, or otherwise to assure a
creditor against loss; and (vii) obligations secured by any Liens, whether or
not the obligations have been assumed.

         1.13. [INTENTIONALLY OMITTED]

         1.14. [INTENTIONALLY OMITTED]

         1.15. "Dollars" and the sign "$" mean lawful money of the United States
                -------                              
of America.

         1.16. [INTENTIONALLY OMITTED]

         1.17. "ERISA" means the Employee Retirement Income Security Act of
                -----                               
1974, as amended from time to time, and the regulations and published
interpretations thereof.

         1.18. "GAAP" means generally accepted accounting principles in the
                ----
United States, applied on a consistent basis.

         1.19. "Guarantor" means AAON, Inc. ("AAON-Nevada"), a Nevada
                ---------                         
corporation.

         1.20. "Guaranty Agreement" means the Guaranty Agreement executed by the
                ------------------                    
Guarantor, in form and content as set forth on Schedule "1.20" hereto.
                                               ---------------        

         1.21. "Guaranty Resolution" means the certified resolution from the
                -------------------                     
Guarantor, substantially in form and content as set forth on Schedule "1.21"
                                                             --------------
hereto.


         1.22. "Initial Default" means any of the events specified in Section 9,
                ---------------                         
whether or not any requirement for the giving of notice, the lapse of time, or
both, or any other condition has been satisfied.

         1.23. "Interest Period" means with respect to any LIBOR Loan, the
                ---------------                       
thirty (30) or ninety (90) day period commencing on the date such loan is made
and ending, as the Borrowers may select, pursuant to Section 2.4, on the
numerically corresponding day in the first or third calendar months thereafter,
except that each such Interest Period that commences on the last Business Day of
a calendar month (or on any day for which there is no numerically corresponding
day in the appropriate subsequent calendar month) shall end on the last Business
Day of the appropriate subsequent calendar month; provided that all of the
foregoing provisions relating to Interest Periods are subject to the following:

               (a)  No Interest Period may extend beyond the Termination Date;
     and

               (b)  If an Interest Period would end on a day that is not a
     Business Day, such Interest Period shall be extended to the next Business
     Day unless, in the case

                                      -3-
<PAGE>
 
     of a LIBOR Loan, such Business Day would fall in the next calendar month,
     in which event such Interest Period shall end on the immediately preceding
     Business Day.

          1.24. "Lending Office" means, for each type of Loan, the Lending
                 --------------                         
Office of the Bank (or of an affiliate of the Bank) designated for such type of
Loan on the signature pages hereof or such other office of the Bank (or of an
affiliate of the Bank) as the Bank may from time to time specify to the
Borrowers as the office at which its Loans of such type are to be made and
maintained.

          1.25. "Letter of Credit" means any letter of credit issued pursuant to
                 ----------------                     
Section 2, for which, when issued, a Letter of Credit Fee should be paid.

          1.26. "Letter of Credit Fee" means a fee of one and one-half percent
(1 1/2%) per annum on the face amount of any Letter of Credit issued or renewed
after the date hereof.

          1.27. "LIBOR Interest Rate" means, for each LIBOR Loan, the rate per
                 -------------------                 
annum (rounded upward, if necessary, to the nearest 1/100 of 1%) determined by
the Bank to be the London Interbank Offered Rate for such LIBOR Loan for such
Interest Period.

          1.28. "LIBOR Loan" means any Loan when and to the extent that the
                 ----------                            
interest rate therefor is determined by reference to the LIBOR Interest Rate.

          1.29. "Lien" means any mortgage, pledge, hypothecation, assignment,
                 ----                             
deposit arrangement, encumbrance, lien (statutory or other), or preference,
priority or other security agreement or preferential arrangement of any kind or
nature whatsoever (including, without limitation, any conditional sale or other
title retention agreement, any financing lease having substantially the same
economic effect as any of the foregoing, and the filing of any financing
statement under the Uniform Commercial Code or comparable law of any
jurisdiction in respect of any of the foregoing.)

          1.30. "Loan" means advances under the $12,150,000 Revolving Line.
                 ----
          1.31. "Loan Documents" means this Agreement, the Note, the Security
                 --------------                           
Agreement, the UCC-1 Financing Statement and all other instruments, documents or
agreements required under this Agreement.

          1.32. "London Interbank Offered Rate" applicable to any Interest
                 -----------------------------            
Period for a LIBOR Loan means the thirty (30) or ninety (90) day, as applicable,
rate per annum (rounded upward, if necessary, to the nearest 1/100 of 1%) LIBOR
rate, as published daily in the Money Rates section of the Wall Street Journal.

          1.33. "Matured Default" means any of the events specified in Section
                 ---------------                         
9, provided that any requirement for the giving of notice, the lapse of time, or
both, or any other condition has been satisfied.

                                      -4-
<PAGE>
 
          1.34. "Mortgaged Property" means the property set forth on Schedule
                                                                     --------
"1.34" hereto.
- ------

          1.35. "Multiemployer Plan" means a Plan described in Section
                 ------------------              
4001(a)(3) of ERISA.

          1.36. "Note" means the $12,150,000 Revolving Credit Note.
                 ----                                 

          1.37. "Obligations" means the Obligations defined in Section 3.
                 -----------                       

          1.38. "Opinion of Borrower's Counsel" means a legal opinion from each
                 -----------------------------         
Borrowers' legal counsel including, without limitation, the opinions relating to
each Borrowers and this loan transaction as set forth on Schedule "1.38"
                                                         ---------------
attached hereto.

          1.39. "PBGC" means the Pension Benefit Guaranty Corporation or any
                 ----                                    
entity succeeding to any or all of its functions under ERISA.

          1.40. "Permitted Liens" means, as to Borrowers and all subsidiaries:
                 ---------------                        

                (1)  Liens in favor of the Bank;

                (2)  Liens for taxes or assessments or other government charges
     or levies if not yet due and payable or, if due and payable, if they are
     being contested in good faith by appropriate proceedings and for which
     appropriate reserves are maintained;

                (3)  Liens imposed by law, such as mechanics', materialmen's,
     landlords', warehousemen's, and carriers' liens, and other similar Liens,
     securing obligations incurred in the ordinary course of business which are
     not past due for more than thirty (30) days or which are being contested in
     good faith by appropriate proceedings and for which appropriate reserves
     have been established;

                (4)  Liens under workers' compensation, unemployment insurance,
     Social Security, or similar legislation;

                (5)  Liens, deposits, or pledges to secure the performance of
     bids, tenders, contracts (other than contracts for the payment of money),
     leases (permitted under the terms of this Agreement), public or statutory
     obligations, surety, stay, appeal, indemnity, performance or other similar
     bonds, or other similar obligations arising in the ordinary course of
     business;

                (6)  The liens described on Schedule "1.40(6);" and
                                            -------------------    

                (7)  Easements, rights-of-way, restrictions, and other similar
     encumbrances which, in the aggregate, do not materially interfere with the
     occupation, use and enjoyment by the Borrowers of the property or assets
     encumbered thereby in the

                                      -5-
<PAGE>
 
     normal course of its business or materially impair the value of the
     property subject thereto.

          1.41. "Person" means an individual, partnership, corporation, business
                 ------                                   
trust, joint stock company, trust, unincorporated association, joint venture,
governmental authority, or other entity of whatever nature.

          1.42. "Plan" means any pension plan which is covered by Title IV of
                 ----                                 
ERISA and in respect of which the Borrowers or a Commonly Controlled Entity is
an "employer" as defined in Section 3(5) of ERISA.

          1.43. "Prime Loan" means any Loan when and to the extent that the
                 ----------                            
interest rate therefor is determined by reference to the Prime Rate.

          1.44. "Principal Office" means the Bank's main office located at Seven
                 ----------------                       
East Second Street, Tulsa, Oklahoma, 74172.

          1.45. "Prohibited Transaction" means any transaction set forth in
                 ----------------------           
Section 406 of ERISA or Section 4975 of the Code.

          1.46. "Receivables" means and includes all accounts, accounts
                 -----------                        
receivable, reimbursements, notes receivable, contracts, contract rights,
chattel paper, documents and instruments arising out of the sale of goods or
services rendered and any and all agreements for the sale of goods or products
or furnishing of services by either or both of the Borrowers, including
agreements between Borrowers and K-Mart Corporation or Wal-Mart Stores, Inc.,
including, without limitation, all employment agreements, sales contracts and
purchase orders.

          1.47. "Reportable Event" means any of the events set forth in Section
                 ----------------                         
4043 of ERISA.

          1.48. "Security Agreement" means the Security Agreement and other
                 ------------------                    
Collateral documents described in Section 3.

          1.49. "UCC" shall mean the Uniform Commercial Code of the State of
                 ---                                   
Oklahoma.

          1.50. "UCC-1 Chattel Check" means a UCC Information and/or Copy
                 -------------------             
Request as to Borrowers from the Chattel Records Division of the Oklahoma County
Clerk, and from any other office deemed necessary or advisable by Bank, which
chattel checks must evidence no conflicting security interests, except the
Permitted Liens.

          1.51. "UCC-1 Financing Statement" means a financing statement in form
                 -------------------------         
and content substantially as set forth on Schedule "1.50" attached hereto, which
will be filed with the appropriate office and shall evidence perfection of a
first and prior security interest in the collateral described in the Security
Agreements in favor of Bank, except for the Permitted Liens. 

                                      -6-
<PAGE>
 
          1.52. "Termination Date" means June 30, 1998.
                 ----------------                      

     2.   AMOUNT AND TERMS OF THE LOANS.
          ----------------------------- 

          2.1.  Revolving Credit.  The Bank agrees, on the terms and conditions
                ----------------                                
hereinafter set forth, to make loans (in the form of advances or the issuance of
Letters of Credit with expiration dates not to exceed the Termination Date) (the
"Revolving Credit Loan") to the Borrowers from time to time during the period
from the date of this Agreement up to but not including the Termination Date in
the aggregate principal amount not to exceed at any time outstanding (or
committed under Letters of Credit) TWELVE MILLION ONE HUNDRED FIFTY THOUSAND AND
NO/100 DOLLARS ($12,150,000.00) ("$12,150,000 Revolving Line") as such amount
may be reduced pursuant to Section 2.2 (the "Commitment"). Each Revolving Credit
Loan which shall not utilize the Commitment in full shall be in an amount not
less than Ten Thousand Dollars ($10,000.00). Within the limits of the
Commitment, the Borrowers may borrow, repay pursuant to Section 2.7, and
reborrow under this Section 2.1. On such terms and conditions, the Loans may be
outstanding as Prime Loans or LIBOR Loans. Each type of Loan shall be made and
maintained at the Bank's Lending Office for such type of Loan. Each Letter of
Credit shall be evidenced by the execution of Bank's customarily required
documents and payment of its customary fees.

          2.2.  Reduction of Commitment.  The Borrowers shall have the right,
                -----------------------                           
upon at least three (3) Business Days' written notice to the Bank, to terminate
in whole or reduce in part the unused portion of the Commitment, provided that
each partial reduction shall be in the amount of not less than One Hundred
Thousand Dollars ($100,000.00). The Commitment, once reduced or terminated, may
not be reinstated, unless Bank written approval.

          2.3.  Notice and Manner of Borrowing.  The Borrowers shall give the
                ------------------------------                
Bank written or telefax notice (effective upon receipt) of any Revolving Credit
Loans under this Agreement, by no later than 1:30 p.m. (Tulsa Time) on the date
upon which the Loan is requested, specifying: (1) the amount of the Loan; and
(2) the duration of the Interest Period applicable thereto, if a LIBOR loan. The
Bank will make the proceeds of the Loan available to the Borrowers on the day of
the Loan request in immediately available funds by crediting the amount thereof
to the Borrowers' account with the Bank.

          2.4.  Conversions and Renewals.  The Borrowers may elect from time to
                ------------------------                          
time to convert all or a part of one type of Loan into another type of Loan or
to renew all or part of a Loan by giving the Bank notice by at least 1:30 p.m.
(Tulsa Time) on the date of conversion or renewal, specifying: (1) the renewal
or conversion date; (2) the amount of the Loan to be converted or renewed; (3)
in the case of conversions, the type of Loan to be converted into; and (4) in
the case of renewals of or a conversion into LIBOR Loans, the duration of the
Interest Period applicable thereto; provided that the LIBOR Loans can be
converted only on the last day of the Interest Period for such Loan. If the
Borrowers shall fail to give the Bank the notice as specified above for the
renewal or conversion of a LIBOR Loan, then the interest rate shall
automatically be converted into a Prime Loan on the last day of the Interest
Period for such LIBOR Loan.

                                      -7-
<PAGE>
 
          2.5.  Interest.  The Borrowers shall pay interest to the Bank on the
                --------                                          
outstanding and unpaid principal amount of the Revolving Credit Loans made under
this Agreement at a rate per annum as follows:

                2.5.1.  Rates.
                        ----- 

                (1)     For a Prime Loan at a rate equal to the Prime Rate,
     floating, per annum;

                (2)     For a LIBOR Loan at a rate equal to the LIBOR Interest
     Rate plus one and eighty-five hundredths percent (1.85%) per annum.

          Any change in the interest rate based on the Prime Rate resulting from
a change in the Prime Rate shall be effective as of the opening of business on
the day on which such change in the Prime Rate becomes effective.  Interest on
each Loan shall be calculated on the basis of a year of 360 days for the actual
number of days elapsed.

                2.5.2.  Interest Payments.  Interest on the Loans shall be paid
                        -----------------                        
     with immediately available funds at the Principal Office for the account of
     the applicable Lending Office as follows:

                (1)     For each Prime Loan, on the last day of each month and
     at maturity for such Loan;

                (2)     For each LIBOR Loan, on the last day of the Interest
     Period with respect thereto.

                2.5.3.  Past Due Interest Rates.  Any principal amount which is
                        -----------------------                
     not paid when due (at maturity, by acceleration, or otherwise) shall bear
     interest thereafter until paid in full, payable on demand, at a rate per
     annum equal to:

                (1)     For each Prime Loan at a rate equal to the Prime Rate
     plus six and one-half percent (6 1/2%) per annum;

                (2)     For each LIBOR Loan at a rate equal to the LIBOR
     Interest Rate plus nine percent (9%) per annum from the time of default in
     payment of principal until the end of the then current Interest Period
     therefor, and thereafter at a rate equal to the Prime Rate plus six and 
     one-half percent (6 1/2%) per annum; and

          2.6.  Note.  All Revolving Credit Loans made by the Bank under this
                ----                                              
Agreement shall be evidenced by, and repaid with interest in accordance with, a
single promissory note of the Borrowers in substantially the form of Schedule
                                                                     --------
"2.6" duly completed, in the principal amount of TWELVE MILLION ONE HUNDRED
- ----
FIFTY THOUSAND AND NO/100 DOLLARS ($12,150,000.00), dated the date of this
Agreement, payable to the Bank for the account of the applicable Lending Office
and maturing as to principal on the Termination Date

                                      -8-
<PAGE>
 
(the "Revolving Credit Note").  The Bank is hereby authorized by the Borrowers
to endorse on the schedule attached to the Revolving Credit Note the amount and
type of each Revolving Credit Loan and each renewal, conversion, and payment of
principal amount received by the Bank for the account of the applicable Lending
Office on account of the Revolving Credit Loans, which endorsement shall, in the
absence of manifest error, confirm and evidence the outstanding balance of the
Revolving Credit Loans made by the Bank; provided, however, that the failure to
make such notation with respect to any Revolving Credit Loan or renewal,
conversion, or payment shall not limit or otherwise affect the obligations of
the Borrowers under this Agreement or the Revolving Credit Note.

          2.7.  Method of Payment.  The Borrowers shall make each payment under
                -----------------                                
this Agreement and under the Note not later than 1:30 p.m. (Tulsa Time) on the
date when due in lawful money of the United States to the Bank at its Principal
Office for the account of the applicable Lending Office in immediately available
funds. The Borrowers hereby authorize the Bank, if and to the extent payment is
not made when due under this Agreement or under the Note, to charge from time to
time against any account of the Borrowers with the Bank any amount so due.
Whenever any payment to be made under this Agreement or under the Note shall be
stated to be due on a day other than a Business Day, such payment shall be made
on the next succeeding Business Day, and such extension of time shall in such
case be included in the computation of the payment of interest and the
commitment fee, as the case may be, except, in the case of a LIBOR Loan, if the
result of such extension would be to extend such payment into another calendar
month, such payment shall be made on the immediately preceding Business Day.

          2.8.  Use of Proceeds.  The proceeds of the Loans hereunder shall be
                ---------------                            
used by the Borrowers to consolidate debt, fund working capital and be available
for standby and commercial letters of credit. The Borrowers will not, directly
or indirectly, use any part of such proceeds for the purpose of purchasing or
carrying any margin stock within the meaning of Regulation U of the Board of
Governors of the Federal Reserve System or to extend credit to any Person for
the purpose of purchasing or carrying any such margin stock, or for any purpose
which violates, or is inconsistent with, Regulation X of such Board of
Governors.

          2.9.  Illegality.  Notwithstanding any other provision in this
                ----------                                      
Agreement, if the Bank determines that any applicable law, rule, or regulation,
or any change therein, or any change in the interpretation or administration
thereof by any governmental authority, central bank, or comparable agency
charged with the interpretation or administration thereof, or compliance by the
Bank (or its Lending Office) with any request or directive (whether or not
having the force of law) of any such authority, central bank, or comparable
agency shall make it unlawful or impossible for the Bank (or its Lending Office)
to (1) maintain its commitment, then upon three (3) days notice to the Borrowers
by the Bank the commitment of the Bank shall terminate; or (2) maintain or fund
its LIBOR Loans, then upon three (3) days written notice to the Borrowers by the
Bank the outstanding principal amount of the LIBOR Loans, together with interest
accrued thereon, and any other amounts payable to the Bank under this Agreement
shall be repaid (a) immediately upon demand of the Bank if such change or
compliance with such 

                                      -9-
<PAGE>
 
request, in the judgment of the Bank, requires immediate repayment; or (b) at
the expiration of the last Interest Period to expire before the effective date
of any such change or request.

          2.10. Disaster.  Notwithstanding anything to the contrary herein, if
                --------                                  
the Bank determines (which determination shall be conclusive) that:

                (1)  Quotations of interest rates for the relevant deposits
     referred to in the definition of LIBOR Interest Rate are not being provided
     in the relevant amounts or for the relative maturities for purposes of
     determining the rate of interest on a LIBOR Loan as provided in this
     Agreement; or

                (2)  The relevant rates of interest referred to in the
     definition of LIBOR Interest Rate upon the basis of which the rate of
     interest for any such type of loan is to be determined do not accurately
     cover the cost to the bank of making or maintaining such type of Loans;

then the Bank shall forthwith give three (3) days written notice thereof to the
Borrowers, whereupon (a) the obligation of the Bank to make LIBOR Loans shall be
suspended until the Bank notifies the Borrowers that the circumstances giving
rise to such suspension no longer exist; and (b) the Borrowers shall repay in
full the then outstanding principal amount of each LIBOR Loan together with
accrued interest thereon, on the last day of the then current Interest Period
applicable to such Loan.

          2.11. Increased Cost.  The Borrowers shall pay to the Bank from time
                --------------                          
to time such amounts as the Bank may determine to be necessary to compensate the
Bank for any costs incurred by the Bank which the Bank determines are
attributable to its making or maintaining any LIBOR Loans hereunder or its
obligation to make any such Loan hereunder, or any reduction in any amount
receivable by the Bank under this Agreement or the Note in respect of any such
Loans or such obligation (such increases in costs and reductions in amounts
receivable being herein called "Additional Costs"), resulting from any change
after the date of this Agreement in U.S. federal, state, municipal, or foreign
laws or regulations (including Regulation D), or the adoption or making after
such date of any interpretations, directives, or requirements applying to a
class of banks including the Bank or under any U.S. federal, state, municipal,
or any foreign laws or regulations (whether or not having the force of law) by
any court or governmental or monetary authority charged with the interpretation
or administration thereof ("Regulatory Change"), which: (1) changes the basis of
taxation of any amounts payable to the Bank under this Agreement or the Note in
respect of any of such Loans (other than taxes imposed on the overall net income
of the Bank or of its Lending Office for any of such Loans by the jurisdiction
where the Principal Office or such Lending Office is located); or (2) imposes or
modifies any reserve, special deposit, compulsory loan, or similar requirements
relating to any extensions of credit or other assets of, or any deposits with or
other liabilities of, the Bank (including any of such Loans or any deposits
referred to in the definition of LIBOR Interest Rate; or (3) imposes any other
condition affecting this Agreement or the Note (or any of such extensions of
credit or liabilities). The Bank will notify the Borrowers of any event
occurring after the date of this Agreement which will entitle the Bank to
compensation pursuant to this 

                                      -10-
<PAGE>
 
Section 2.11 as promptly as practicable after it obtains knowledge thereof and
determines to request such compensation.

          Determinations by the Bank for the purpose of this Section 2.11 of the
effect of any Regulatory Change on its costs of making or maintaining Loans or
on amounts receivable by it in respect of the Loans, and of the additional
amounts required to compensate the Bank in respect of any Additional Costs,
shall be conclusive, provided that such determinations are made on a reasonable
basis.

          2.12. Risk-Based Capital.  In the event Bank determines that (1)
                ------------------                    
compliance with any judicial, administrative, or other governmental
interpretation of any law or regulation or (2) compliance by the Bank or any
corporation controlling the Bank with any guideline or request from any central
bank or other governmental authority (whether or not having the force of law)
has the effect of requiring an increase in the amount of capital required or
expected to be maintained by the Bank or any corporation controlling the Bank,
and the Bank determines that such increase is based upon its obligations
hereunder, and other similar obligations, the Borrowers shall pay to the Bank
such additional amount as shall be certified by the Bank to be the amount
allocable to the Bank's obligations to the Borrowers hereunder. The Bank will
notify the Borrowers of any event occurring after the date of this Agreement
that will entitle the Bank to compensation pursuant to this Section 2.12 as
promptly as practicable after it obtains knowledge thereof and determines to
request such compensation.

          Determinations by the Bank for purposes of this Section 2.12 of the
effect of any increase in the amount of capital required to be maintained by the
Bank and of the amount allocable to the Bank's obligations to the Borrowers
hereunder shall be conclusive, provided that such determinations are made on a
reasonable basis.

          2.13. Funding Loss Indemnification.  The Borrowers shall pay to the
                ----------------------------      
Bank, upon the request of the Bank, such amount or amounts as shall be
sufficient (in the reasonable opinion of the Bank) to compensate it for any
loss, cost, or expense incurred as a result of:

                (1)  Any failure by the Borrowers to borrow or convert, as the
     case may be, a LIBOR Loan on the date for borrowing or conversion, as the
     case may be, specified in the relevant notice under Section 2.3 or 2.4, as
     the case may be.

     3.   SECURITY.  As security for any and all indebtedness, obligations or
          --------                                            
liabilities of every kind and description of Borrowers to Bank, including,
without limitation, all advances and Loans evidenced by the Note, and any other
advances or loans made pursuant to this Agreement or any other instrument,
document, agreement executed and/or delivered by Borrowers to Bank in connection
herewith, including any extensions, renewals or changes in form of the Note, and
any other obligations or liabilities now existing or hereafter arising, direct
or indirect, absolute or contingent, joint and/or several, howsoever created or
obtained (separately and collectively, the "Obligations"), Borrowers grant to
Bank the following liens and security interests and also agrees as follows:

                                      -11-
<PAGE>
 
          3.1. A first and prior security interest in all:

               (i)   Receivables;

               (ii)  all inventory of goods, merchandise, supplies, and
               material;

               (iii) all general intangibles of the Borrowers, whether now
               owned or hereafter acquired, including, without limitation:

                     (a) all sales contracts, purchase orders and employee
                     agreements;

                     (b) all processes, formulae, scientific and/or technical
                     information, trade secrets, customer lists, plans, reports,
                     samples, prototypes, know-how, all items in application,
                     development or other pending status and all similar items
                     which are used in connection with the Borrowers' conduct of
                     their business; and

                     (c) all of Borrowers' rights, titles, interests, and
                     benefits under all partnerships and joint venture
                     agreements between either of the Borrowers and any other
                     Person and under all leases of real and personal property
                     (whether as lessor or lessee); provided, however, that the
                     Bank hereby assumes no liabilities, obligations or
                     responsibilities in connection therewith;

               (iv)  all cash, money, certificates of deposit, time deposits and
               demand deposits of the Borrowers, at any time in the possession
               or control of the Bank;

               (v)  all ledgers, journals, books, records, vouchers, shipping
               tickets, receipts, sales memoranda, contracts, partnership
               agreements, joint venture agreements, correspondence and other
               writings, data or papers evidencing or relating to the items or
               types of collateral described above in subsections (i) through

               (iv) inclusive; and

               (vi) All proceeds and products of the foregoing;

          whether now owned or hereafter acquired, howsoever arising or
          wheresoever located, all as evidenced by the Security Agreement set
          forth on Schedule "3.1" attached hereto.
                   --------------                 

          3.2.  Borrowers also agree to execute and deliver all financing
statements or other instruments, documents or agreements required by Bank in
order to effectuate the intent of the parties in connection herewith, including
without limitation documents necessary for proper perfection as deemed necessary
and/or advisable by Bank and legal counsel.

                                      -12-
<PAGE>
 
     4.   CONDITIONS PRECEDENT.
          -------------------- 

          4.1. Conditions Precedent.  The obligation of the Bank to make the
               --------------------                                         
initial Revolving Credit Loan to Borrowers is subject to the conditions
precedent that the Bank shall have received on or before the day of such
Revolving Credit Loan each of the following, in form and substance satisfactory
to the Bank and its counsel;

               A.  Note.  The Revolving Credit Note duly executed by the
                   ----                                                 
     Borrowers.

               B.  Security Agreement.  A Security Agreement duly executed by
                   ------------------                                        
     the Borrowers, together with the Financing Statements (Form UCC-1) in the
     form of Schedule "1.51", duly filed under the Uniform Commercial Code of
             ---------------                                                 
     all jurisdictions necessary or, in the opinion of the Bank, desirable to
     perfect the security interest created by the Security Agreement.

               C.  Evidence of all Corporate Action by Borrowers.  Certified (as
                   ---------------------------------------------                
     of the date of this Agreement) copies of all corporate action taken by the
     Borrowers, including resolutions of its Board of Directors, authorizing the
     execution, delivery, and performance of the Loan Documents to which it is a
     party and each other document to be delivered pursuant to this Agreement.

               D.  Incumbency and Signature Certificate of Borrowers.  A
                   -------------------------------------------------    
     certificate (dated as of the date of this Agreement) of the Secretary of
     the Borrowers certifying the names and true signatures of the officers of
     the Borrowers authorized to sign the Loan Documents to which it is a party
     and the other documents to be delivered by the Borrowers under this
     Agreement.

               E.  Guaranty.  A Guaranty duly executed by the Guarantor, in the
                   --------                                                    
     form and content of Schedule "1.20", attached hereto.
                         ---------------                  

               F.  Evidence of all Corporate Action by the Guarantor.  Certified
                   -------------------------------------------------            
     (as of the date of this Agreement) copies of all corporate action taken by
     the Guarantor, including resolutions of its Board of Directors, authorizing
     the execution, delivery, and performance of the Guaranty.

               G.  Incumbency and Signature Certificate of the Guaranty.  A
                   ----------------------------------------------------    
     certificate (dated as of the date of the date of this Agreement) of the
     Secretary of the Guaranty certifying the names and true signatures of the
     officers of the Guarantor authorized to sign the Guaranty; and

               H.  Any other instruments, documents or agreements reasonably
     requested by Bank in connection herewith.

                                      -13-
<PAGE>
 
          4.2.  Conditions Precedent to All Revolving Credit Loans.  The
                --------------------------------------------------      
obligation of the Bank to make each Revolving Credit Loan (including the initial
Revolving Credit Loan) shall be subject to the further conditions precedent that
on the date of such Loan:

               (1)  The following statements shall be true and the Bank shall
     have received a certificate signed by a duly authorized officer of the
     Borrowers dated the date of such Revolving Credit Loan, stating that:

                    (a)  The representations and warranties contained in Section
          5 of this Agreement, in Section 2 of the Security Agreement, and in
          the Guaranty are correct on and as of the date of such Loan as though
          made on and as of such date; and

                    (b)  No Initial Default or Matured Default has occurred and
          is continuing, or would result from such Loan; and

               (2) The Bank shall have received such other approvals, opinions,
     or documents as the Bank may reasonably request.

     5.   REPRESENTATIONS AND WARRANTIES.  Each of the Borrowers represents and
          ------------------------------                                       
warrants to the Bank that:

          5.1. Incorporation, Good Standing, and Due Qualification.  Borrowers
               ---------------------------------------------------            
are corporations duly incorporated, validly existing, and in good standing under
the laws of the State in which they are incorporated; have the corporate powers
and authority to own their assets and to transact the business in which they are
now engaged or proposed to be engaged; and are duly qualified as a foreign
corporation and in good standing under the laws of each other jurisdiction in
which such qualification is required.

          5.2. Corporate Power and Authority.  The execution, delivery, and
               -----------------------------                               
performance by Borrowers of the Loan Documents have been duly authorized by all
necessary corporate action and do not and will not (1) require any consent or
approval of the stockholders which has not been given; (2) contravene Borrowers'
charter or bylaws; (3) violate any provision of any law, rule, regulation
(including, without limitation, Regulations U and X of the Board of Governors of
the Federal Reserve System), order, writ, judgment, injunction, decree,
determination, or award presently in effect having applicability to Borrowers;
(4) result in a breach of or constitute a default under any indenture or loan or
credit agreement or any other agreement, lease, or instrument to which Borrowers
are a party or by which they or their properties may be bound or affected; (5)
result in, or require, the creation or imposition of any lien, upon or with
respect to any of the properties now owned or hereafter acquired by Borrowers;
or (6) cause Borrowers to be in default under any such law, rule, regulation,
order, writ, judgment, injunction, decree, determination, or award or any such
indenture, agreement, lease, or instrument.

                                      -14-
<PAGE>
 
          5.3. Legally Enforceable Agreement.  This Agreement is, and each of
               -----------------------------                                 
the other Loan Documents when delivered under this Agreement will be, legal,
valid, and binding obligations of Borrowers, enforceable against Borrowers in
accordance with their respective terms, except to the extent that such
enforcement may be limited by applicable bankruptcy, insolvency, and other laws
affecting creditors' rights generally.

          5.4. Financial Statements.  The balance sheets of Borrowers as of
               --------------------                                        
December 31, 1995, the related statements of income and retained earnings of
Borrowers for the twelve (12) months then ended, are complete and correct and
fairly present the financial condition of Borrowers at such date and the results
of the operations of Borrowers for the period covered by such statements, all in
accordance with generally accepted accounting principals ("GAAP") consistently
applied, and there has been no material adverse change in the condition
(financial or otherwise), business or operations of Borrowers (other than the
change in stock ownership and the obligations relating to such acquisition).
There are no liabilities of Borrowers, fixed or contingent, which are material
but not reflected in such financial statements or in the notes thereto, other
than liabilities arising in the ordinary course of business.  No information,
exhibit, or report furnished by the Borrowers to the Bank in connection with the
negotiation of this Agreement contains any material misstatement of fact or
omits to state a material fact or any fact necessary to make the statement
contained therein not materially misleading.

          5.5. Labor Disputes and Acts of God.  Neither the business nor the
               ------------------------------                               
properties of either Borrower is affected by any fire, explosion, accident,
strike, lockout or other labor dispute, drought, storm, hail, earthquake,
embargo, act of God or other casualty (whether or not covered by insurance),
which materially adversely affected such business or the operation of either
Borrower.

          5.6. Other Agreements.  Borrowers are not parties to any indenture,
               ----------------                                              
loan, or credit agreement, or to any lease or other agreement or instrument, or
subject to any charter or corporate restriction, which could have a material
adverse effect on the business, properties, assets, operations, or condition,
financial or otherwise, of Borrowers or the ability of Borrowers to carry out
their obligations under the Loan Documents.  Neither Borrower is in material
default in any respect in the performance, observance, or fulfillment of any of
the obligations, covenants, or conditions contained in any agreement or
instrument material to its business to which it is a party.

          5.7. Litigation.  There is no pending or threatened action or
               ----------                                              
proceeding against or affecting either Borrower before any court, governmental
agency or arbitrator, which may, in any one case or in the aggregate, materially
adversely affect the financial condition, operations, properties, or business of
either Borrower or the ability of Borrowers to perform their obligations under
the Loan Documents.  Any litigation which does exist is set forth in detail
satisfactory to Bank on Schedule "5.7" hereto, but Borrowers represent to Bank
                        --------------                                        
that such litigation does not violate this Section 5.7.

                                      -15-
<PAGE>
 
          5.8.   Ownership and Liens.  Borrowers have title to, or valid
                 -------------------                                    
leasehold interests in, all of its properties and assets, real and personal,
including the properties and assets and leasehold interest reflected in the
financial statements referred to in Section 5.4, and none of the properties and
assets owned by Borrowers, and none of its leasehold interests, are subject to
any lien, except the Permitted Liens.

          5.9.   ERISA.  Borrowers are in compliance in all material respects
                 -----
with all applicable provisions of ERISA. Neither a Reportable Event nor a
Prohibited Transaction has occurred and is continuing with respect to any Plan;
no notice of intent to terminate a Plan has been filed, nor has any Plan been
terminated; no circumstances exist which constitute grounds entitling the PBGC
to institute proceedings to terminate, or appoint a trustee to administer, a
Plan, nor has the PBGC instituted any such proceedings; neither Borrower nor any
Commonly Controlled Entity has completely or partially withdrawn from a
Multiemployer Plan; Borrowers and each Commonly Controlled Entity have met their
minimum funding requirements under ERISA with respect to all of their Plans and
the present value of all vested benefits under each Plan exceeds the fair market
value of all Plan assets allocable to such benefits, as determined on the most
recent valuation date of the Plan and in accordance with the provisions of
ERISA; and neither Borrowers nor any Commonly Controlled Entity has incurred any
liability to the PBGC under ERISA.

          5.10.  Operation of Business.  Borrowers possess all licenses,
                 ---------------------
permits, franchises, patents, copyrights, trademarks, and trade names, or rights
thereto, to conduct its business substantially as now conducted and as presently
proposed to be conducted, and Borrowers are not in violation of any valid rights
of others with respect to any of the foregoing.

          5.11.  Taxes.  Borrowers have filed all tax returns (federal, state
                 -----                                                       
and local) required to be filed and have paid all taxes, assessments, and
governmental charges and levies shown thereon to be due, including interest and
penalties.

          5.12.  Debt.  Schedule "5.12" is a complete and correct list of all
                 ----   ---------------                                      
credit agreements, indentures, purchase agreements, guaranties, capital leases,
and other investments, agreements, and arrangements presently in effect
providing for or relating to extensions of credit (including agreements and
arrangements for the issuance of letters of credit or for acceptance financing)
in respect of which Borrowers are in any manner directly or contingently
obligated; and the maximum principal or face amounts of the debt in question,
which are outstanding and which can be outstanding, are correctly stated, and
all liens of any nature given or agreed to be given as security therefor are
correctly described or indicated in such Schedule.  With regard to any guaranty
or other contingent obligation of Borrowers, Borrowers shall promptly notify
Bank in the event any such obligation becomes non-contingent.

          5.13.  Environment.  Borrowers have duly complied with, and their
                 -----------                                               
business, operations, assets, equipment, property, leaseholds, or other
facilities are in compliance with, the provisions of all federal, state, and
local environmental, health and safety laws, codes and ordinances, and all rules
and regulations promulgated thereunder.  Borrowers have been issued and will
maintain all required federal, state, and local permits, licenses, certificates
and

                                      -16-
<PAGE>
 
approvals relating to (1) air emissions; (2) discharges to surface or
groundwater; (3) noise emissions; (4) solid or liquid waste disposal; (5) the
use, generation, storage, transportation or disposal of toxic or hazardous
substances or wastes (intended hereby and hereafter to include any and all such
materials listed in any federal, state, or local law, code or ordinance, and all
rules and regulations promulgated thereunder as hazardous or potentially
hazardous); or (6) other environmental, health or safety matters.  Borrowers
have not received notice of, nor to its best knowledge knows of or suspects,
facts which might constitute any violations of any federal, state or local
environmental, health, or safety laws, codes or ordinances, and any rules or
regulations promulgated thereunder with respect to its business, operations,
assets, equipment, property, leaseholds, or other facilities.  To Borrowers'
best knowledge, there has been no emission, spill, release, or discharge into or
upon (1) the air; (2) soils, or any improvements located thereon; (3) surface
water or groundwater; or (4) the sewer, septic system or waste treatment,
storage or disposal system servicing the premises, of any toxic or hazardous
substances or wastes at or from the premises; and accordingly the premises of
the Borrowers are free of all such toxic or hazardous substances or wastes.
Except as disclosed in writing to Bank, there has been no complaint, order,
directive, claim, citation, or notice by any governmental authority or any
person or entity with respect to (1) air emissions; (2) spills, releases, or
discharges to soils or improvements located thereon, surface water, groundwater
or the sewer, septic system or waste treatment, storage or disposal systems
servicing the premises; (3) noise emissions; (4) solid or liquid waste disposal;
(5) the use, generation, storage, transportation, or disposal of toxic or
hazardous substances or waste; or (6) other environmental, health, or safety
matters affecting Borrowers or their business, operations, assets, equipment,
property, leaseholds, or other facilities.  Borrowers have no indebtedness,
obligation, or liability, absolute or contingent, matured or not matured, with
respect to the storage, treatment, cleanup or disposal of any solid wastes,
hazardous wastes or other toxic or hazardous substances (including without
limitation any such indebtedness, obligation, or liability with respect to any
current regulation, law, or statute regarding such storage, treatment, cleanup
or disposal).

     6.   AFFIRMATIVE COVENANTS.  So long as any Note shall remain unpaid or the
          ---------------------                                                 
Bank shall have any Commitment under this Agreement, Borrowers will comply with
the following:

          6.1.   Maintenance of Existence.  Preserve and maintain their
                 ------------------------
corporate existence and good standing in the states in which they do business,
and qualify and remain qualified as a foreign corporation in each jurisdiction
in which such qualification is required.

          6.2.   Maintenance of Records.  Keep adequate records and books of
                 ----------------------                                     
account, in which complete entries will be made in accordance with GAAP
consistently applied, reflecting all financial transactions.

          6.3.   Maintenance of Properties.  Each of the Borrowers will at all
                 -------------------------                                    
times maintain, preserve and protect all franchises and trade names and keep all
the remainder of its properties which are used or useful in the conduct of its
respective businesses whether owned in fee or otherwise, or leased, in good
repair and operating condition; from time to time make, or cause to be made, all
needful and proper repairs, renewals, replacements, betterments and

                                      -17-
<PAGE>
 
improvements thereto so that the business carried on in connection therewith may
be properly and advantageously conducted at all times; and comply with all
material leases to which it is a party or under which it occupies property so as
to prevent any material loss or forfeiture thereunder.

          6.4.   Lockbox.  Borrowers shall establish and maintain a lockbox in
                 -------                                                      
Bank pursuant to an agreement in form and substance satisfactory to Bank which
shall provide, in part, that:  (a) Borrowers shall deposit all checks and other
instruments with respect to their notes, chattel paper or accounts receivable in
the form received by them in the lockbox, (b) unless otherwise directed by Bank,
Borrowers shall direct their debtors and customers to make all payments in
respect to their accounts receivable directly to the lockbox at Bank, (c) Bank
shall deposit all items received by it to accounts designated by the Bank for
the Borrowers, provided no Matured Default shall have occurred and be
continuing, and (d) if a Matured Default shall have occurred and be continuing,
all such payments may be applied to the Indebtedness, at such times and in such
order as Bank may elect.

          6.5.   Conduct of Business.  Continue to engage in an efficient and
                 -------------------                                         
economical manner, a business of the same general type as conducted by Borrowers
on the date of this Agreement.

          6.6.   Maintenance of Insurance.  Borrowers will keep or cause to be
                 ------------------------                                     
kept adequately insured by financially sound and reputable insurers their plant,
equipment, motor vehicles, and all other property of a character usually insured
by businesses engaged in the same or similar businesses.  Upon demand by the
Bank, any insurance policies covering the Collateral shall be endorsed to
provide for payment of losses to the Bank as its interest may appear, to provide
that such policies may not be canceled, reduced or affected in any manner for
any reason without thirty (30) days prior notice to the Bank, and to provide for
any other matters which the Bank may reasonably require; and such insurance
shall be against fire, casualty and any other hazards normally insured against
and shall be in the amount of the full value (less a reasonable deductible not
to exceed amounts customary in the industry for similarly situated businesses
and properties) of the property insured.  The Borrowers shall at all times
maintain adequate insurance against damage to persons or property, which
insurance shall be by financially sound and reputable insurers and shall,
without limitation, provide the following coverages:  comprehensive general
liability (including, without limitation, coverage, where applicable, for damage
caused by explosion, broad form property damage coverage, broad form coverage
for contractually independent contractors), worker's compensation, products
liability and automobile liability.

          6.7.   Compliance with Laws.  Comply in all material respects with all
                 --------------------                                           
applicable laws, rules, regulations, and orders, such compliance to include,
without limitation, paying before the same become delinquent all taxes,
assessments, and governmental charges imposed upon them or upon their property.

          6.8.   Right of Inspection.  At any reasonable time and from time to
                 -------------------                                          
time, and following twenty-four (24) hours prior written notice, permit the Bank
or any agent or

                                      -18-
<PAGE>
 
representative thereof, to reasonably examine and make copies of and abstracts
from the records and books of account of, and visit the properties of,
Borrowers, and to discuss the affairs, finances, and accounts of Borrowers with
any of their officers and directors and Borrowers' independent accountants.
Upon any Initial Default, the Borrowers will surrender all of such records
relating to the Collateral to the Bank upon receipt of any request therefor from
the Bank.

          6.9.   Reporting Requirements.  Furnish to Bank:
                 ----------------------                   

                 6.9.1.  Financial Reports.
                         ----------------- 

                         (a)  Quarterly Financial Statements.  The Borrowers
                              ------------------------------
          shall maintain a standard system of accounting and shall furnish to
          the Bank as soon as practicable after the end of the first three
          quarters of each fiscal year, commencing with the quarter ended June
          30, 1996, and in any event within forty-five (45) days after the end
          of each said quarter, consolidated financial statements for AAON
          (Nevada) which shall be certified on behalf of AAON (Nevada) by the
          President or the chief financial officer of AAON (Nevada) to have been
          prepared in accordance with GAAP consistently applied and to fairly
          present the financial condition of AAON (Nevada) for such period, and
          shall include at least a balance sheet as at the end of such period,
          and a statement of income, all in reasonable detail.

                         (b)  Annual Financial Statements.  As soon as
                              ---------------------------
          practicable after the end of each fiscal year of AAON (Nevada) and in
          any event within 120 days thereafter, the Borrowers shall furnish to
          the Bank the following financial statements prepared in accordance
          with GAAP, together with an unqualified opinion of independent
          certified public accountants of recognized standing selected by AAON
          (Nevada) and acceptable to Bank:

                              (i)    A balance sheet of AAON (Nevada) at the end
                 of such year prepared on a consolidated basis,

                              (ii)   A statement of income of AAON (Nevada) for
                 such year prepared on a consolidated basis, and

                              (iii)  A statement of cash flows of AAON (Nevada)
                 for such year prepared on a consolidated basis,

                 setting forth in each case in comparative form the figures for
                 the previous fiscal year, if applicable, all in reasonable
                 detail. The report of the independent certified public
                 accountants shall contain a certification that in the course of
                 the audit necessary for the certification of such financial
                 statements, they have obtained no knowledge of any Initial
                 Default or Matured Default as defined herein, or, if any
                 Initial Default or Matured Default existed or exists,
                 specifying the nature and period of existence

                                      -19-
<PAGE>
 
                 thereof; provided, however, that such accountants shall not be
                 liable to the Bank by reason of their failure to obtain
                 knowledge of any such Initial Default or Matured Default which
                 would not be disclosed in the course of an audit conducted in
                 accordance with generally accepted auditing standards.

                         (c)  Quarterly Certificates.  As soon as available and
                              ----------------------
          in any event within forty-five (45) days after the end of each of the
          first three calendar quarters of each year, concurrently with the
          furnishing of the applicable quarterly statements pursuant to
          subsection 6.9.1(a), there shall be furnished to Bank a certificate
          signed by the chief financial officer of Borrowers stating that: (a)
          the financial statements were prepared (subject to year end audit
          adjustments) in conformity with GAAP, consistently applied; (b) a
          review of the activities of Borrowers for the period covered by the
          financial statements has been made under his supervision with a view
          to determining whether Borrowers have kept, observed, performed and
          fulfilled all of their obligations under this Agreement, the other
          Loan Documents and every other document or instrument referred to
          herein; and (c) no Initial Default or an event which with the passage
          of time or notice, or both, could become an Initial Default has
          occurred, and is continuing, or a statement describing the nature,
          period of existence and status of any such event(s) if existing. Such
          certificates shall not be qualified or limited because of restricted
          or limited examination of any material portion of Borrowers' records
          by the party preparing such quarterly statements.

                         (d)  Annual Certificates.  Concurrently with the
                              -------------------
          furnishing of the financial statements pursuant to 6.9.1(b), there
          shall be furnished to Bank a separate certificate signed by the chief
          financial officers of Borrowers stating that: (a) the financial
          statements were prepared in conformity with GAAP on a basis
          consistently applied, and (b) no Initial Default or an event which
          with the passage of time or notice, or both, could become an Initial
          Default has occurred, and is continuing, or a statement describing the
          nature, period of existence and status of any such event(s) if
          existing. Such certificate shall not be qualified or limited because
          of restricted or limited examination of any material portion of
          Borrowers' records by the party preparing such annual statements.

                         (e)  Budgets and Projections.  Promptly upon completion
                              -----------------------
          thereof, the Borrowers shall deliver to the Bank a copy of each
          operating budget and projection of financial performance prepared for
          the Borrowers.

                         (f)  Periodic Reports.  Promptly upon their becoming
                              ----------------
          available, copies of all financial statements, reports, proxy
          statements sent by the Borrowers to their stockholders and all
          registration statements, periodic reports and other statements and
          schedules filed by the Borrowers with any securities exchange, the
          Securities and Exchange Commission or any similar state or federal
          governmental authority.

                                      -20-
<PAGE>
 
                 6.9.2.  Management Letters.  Promptly upon receipt thereof,
                         ------------------                                 
          copies of any reports submitted to Borrowers by independent certified
          public accountants in connection with examination of the financial
          statements of Borrowers made by such accountants;

                 6.9.3.  Notice of Litigation.  Promptly after the commencement
                         --------------------                                  
          thereof, notice of all actions, suits, and proceedings before any
          court or governmental department, commission, board, bureau, agency,
          or instrumentality, domestic or foreign, affecting Borrowers, which,
          if determined adversely to Borrowers, could have a material adverse
          effect on the financial condition, properties, or operations of
          Borrowers or result in monetary damages in excess of $100,000;

                 6.9.4.  Notice of Initial Defaults and Matured Defaults.  As
                         -----------------------------------------------     
          soon as possible and in any event within five (5) days after the
          occurrence of each Initial Default or Matured Default, a written
          notice setting forth the details of such Initial Default or Matured
          Default and the action which is proposed to be taken by the Borrowers
          with respect thereto;

                 6.9.5.  ERISA Reports.  As soon as possible, and in any event
                         -------------                                        
          within thirty (30) days after Borrowers know or have reason to know
          that any circumstances exist that constitute grounds entitling the
          PBGC to institute proceedings to terminate a Plan subject to ERISA
          with respect to Borrowers or any Commonly Controlled Entity, and
          promptly but in any event within two (2) Business Days of receipt by
          the Borrowers or any Commonly Controlled Entity of notice that the
          PBGC intends to terminate a Plan or appoint a trustee to administer
          the same, and promptly but in any event within five (5) Business Days
          of the receipt of notice concerning the imposition of withdrawal
          liability with respect to Borrowers or any Commonly Controlled Entity,
          the Borrowers will deliver to the Bank a certificate of the chief
          financial officer of the Borrowers setting forth all relevant details
          and the action which the Borrowers propose to take with respect
          thereto;

                 6.9.6.  Reports to Other Creditors.  Promptly after the
                         --------------------------                     
          furnishing thereof, copies of any statement or report furnished to any
          other party pursuant to the terms of any indenture, loan, credit, or
          similar agreement and not otherwise required to be furnished to the
          Bank pursuant to any other clause of this Section 6;

                 6.9.7.  Proxy Statements, etc.  Promptly after the sending or
                         ----------------------                               
          filing thereof, copies of all proxy statements, financial statements,
          and reports which Borrowers send to their stockholders, and copies of
          all regular, periodic, and special reports, and all registration
          statements which Borrowers file with the Securities and Exchange
          Commission or any governmental authority which may be substituted
          therefor, or with any national securities exchange; and

                 6.9.8.  General Information.  Such other information respecting
                         -------------------                                    
          the condition or operations, financial or otherwise, of Borrowers as
          the Bank may from time to time reasonably request.

                                      -21-
<PAGE>
 
          6.10.  Environment.  Be and remain in material compliance with
                 -----------
the provisions of all federal, state, and local environmental, health and safety
laws, codes and ordinances, and all rules and regulations issued thereunder;
notify the Bank immediately of any notice of a hazardous discharge or
environmental complaint received from any governmental agency or any other
party; notify the Bank immediately of any hazardous discharge from or affecting
its premises; promptly contain and remove the same, in compliance with all
applicable laws; promptly pay any fine or penalty assessed in connection
therewith; permit the Bank to inspect the premises, to conduct tests thereon,
and to inspect all books, correspondence, and records pertaining thereto; and at
the Bank's request, and at Borrowers' expense, provide a report of a qualified
environmental engineer, satisfactory in scope, form, and content to the Bank,
and such other and further assurances reasonably satisfactory to the Bank that
the condition has been corrected.

          6.11.  Operating Accounts.  Maintain its primary operating
                 ------------------
accounts at Bank.

     7.   NEGATIVE COVENANTS.  So long as any Note shall remain unpaid or the
          ------------------                                                 
Bank shall have any Commitment under this Agreement or any letter of credit
issued in connection herewith, Borrowers will not:

          7.1. Negative Pledge.  Create, incur, permit or suffer to exist any
               ---------------                                               
Liens upon any of its assets or properties, now owned or hereafter acquired,
except for the Permitted Liens.

          7.2. Debt. Create, incur, assume, or suffer to exist any Debt,
               ----                                                      
except:
- ------ 

               (1)   Indebtedness arising out of this Agreement;

               (2)   Purchase money indebtedness not to exceed $500,000 in the
     aggregate for any given fiscal year;

               (3)   Current liabilities for taxes and assessments incurred in
     the ordinary course of business;

               (4)   Indebtedness in respect of current accounts payable,
     accrued (other than for borrowed funds or purchase money obligations) and
     incurred in the ordinary course of business, provided that all such
                                                  --------
     liabilities, accounts and claims shall be promptly paid and discharged when
     due or in conformity with customary trade terms;

               (5)   Debt described in Schedule "5.12" but no voluntary
                                       --------------                 
     prepayment, renewals, extensions, or refinancings thereof;

               (6)   Unsecured non-Bank Debt in addition to the debt described
     in Schedule "5.12" not to exceed $100,000 for the Borrowers in the
        ---------------
     aggregate in any given fiscal year;

                                      -22-
<PAGE>
 
               (7)   Accounts payable to trade creditors for goods or services
     which are not past due more than ninety (90) days from the billing date, in
     each case incurred in the ordinary course of business, as presently
     conducted, and paid within the specified time, unless contested in good
     faith and by appropriate proceedings; and

               (8)   Indebtedness of Borrower to BankOne, N.A. for the
     Longview, Texas facility, but no voluntary prepayment, renewals,
     extensions, or refinancings thereof.

          7.3. Mergers, etc.  Wind up, liquidate or dissolve themselves,
               -------------                                            
reorganize, merge or consolidate with or into, or convey, sell, assign,
transfer, lease, or otherwise dispose of (whether in one transaction or in a
series of transactions) all or substantially all of their assets (whether now
owned or hereafter acquired) to any Person.

          7.4. Sale and Leaseback.  Sell, transfer, or otherwise dispose of
               ------------------
any real or personal property to any Person and thereafter directly or
indirectly lease back the same or similar property.

          7.5. Dividends.  Declare or pay any dividends; or purchase, redeem,
               ---------                                                     
retire, or otherwise acquire for value any of its capital stock now or hereafter
outstanding; or make any distribution of assets to its stockholders as such
whether in cash, property, or obligations of the Borrowers; or allocate or
otherwise set apart any sum for the payment of any dividend or distribution on,
or for the purchase, redemption, or retirement of any shares of its capital
stock; or make any distribution by reduction of capital or otherwise in respect
of any shares of its capital stock.  Notwithstanding, Borrower may reacquire up
to $2,000,000 of its outstanding Common Stock, subject to twenty (20) days'
prior written notice to Bank.

          7.6. Sale of Assets.  Sell, lease, assign, transfer, or otherwise
               --------------                                              
dispose of any of its now owned or hereafter acquired assets (including, without
limitation, shares of stock, receivables, and leasehold interests), except:  (1)
inventory disposed of or leased in the ordinary course of business; (2) the sale
or other disposition of assets no longer used or useful in the conduct of its
business; and (3) treasury stock.

          7.7. Guaranties, etc.  Assume, guaranty, endorse, or otherwise be or
               ----------------                                               
become directly or contingently responsible or liable (including, but not
limited to, an agreement to purchase any obligation, stock, assets, goods, or
services, or to supply or advance any funds, assets, goods, or services, or an
agreement to maintain or cause such Person to maintain a minimum working capital
net worth, or otherwise to assure the creditors of any Person against loss) for
obligations of any Person, except guaranties by endorsement of negotiable
instruments for deposits or collection or similar transactions in the ordinary
course of business.

          7.8. Transactions with Affiliates.  The Borrowers will not enter
               ----------------------------
into any transaction, including (without limitation) the purchase, sale or
exchange of property or the rendering or furnishing of any service, with any
Affiliate of either of the Borrowers, except transactions (including, without
limitation, an agreement to employ Norman H. Asbjornson as

                                      -23-
<PAGE>
 
President of Borrowers and stock options provided to senior management) in the
ordinary course of the business of Borrowers and upon fair and reasonable terms
no less favorable than Borrowers would obtain in a transaction for the same
purpose with a Person that is not an Affiliate of either of the Borrowers, and
Borrowers shall not in any case pay to AAON (Nevada) in excess of $100,000 in
any one fiscal year of Borrowers for goods furnished and services rendered by
AAON (Nevada) to Borrowers.

     8.   FINANCIAL COVENANTS.  So long as any Note shall remain unpaid or the
          -------------------                                                 
Bank shall have any Commitment under this Agreement, Borrowers shall comply with
the following on a consolidated basis:

          8.1  Tangible Net Worth.  The Borrowers covenant and agree to
               ------------------
maintain a Tangible Net Worth which, when consolidated with the Tangible Net
Worth of AAON (Nevada), will exceed $12,000,000.

          8.2  Total Liabilities to Tangible Net Worth.  The Borrowers will not
               ---------------------------------------                         
at any time permit the ratio of their Total Liabilities to their Tangible Net
Worth, when consolidated with the Total Liabilities of AAON (Nevada) and
Tangible Net Worth of AAON (Nevada), during any period to be greater than 2 to
1.

          8.3  [INTENTIONALLY OMITTED]

          8.4  Working Capital.  The Borrowers will not at any time permit the
               ---------------                                                
aggregate amount of their Working Capital, when consolidated with the Working
Capital of AAON (Nevada), to be less than $10,000,000.  "Working Capital" shall
mean current assets less current liabilities (notwithstanding, current
liabilities shall not include the outstanding balance of the BOk Revolving
Credit).

          8.5  Capital Expenditures.  The Borrowers agree not to make any
               --------------------                                      
capital expenditure during any fiscal year for the acquisition, construction,
expansion or improvement of capital assets (whether owned or leased or
otherwise) that aggregate in excess of $2,500,000, when combined with the
capital expenditures of AAON (Nevada) for such period or commit for any such
capital expenditure which, if made in the applicable period for delivery and
payment and combined with payments of commitments by AAON (Nevada) for such
period, would result in expenditures in excess of the limitations herein set
forth.

     9.   EVENTS OF DEFAULT.
          ----------------- 

          9.1. Events of Default.  Each of the following shall constitute an
               -----------------                                            
Event of Default hereunder:

               (1)  Borrowers should fail to pay the principal of, or interest
     on, the Note, or any amount of a commitment or other fee within five (5)
     days as and when due and payable;

                                      -24-
<PAGE>
 
               (2)  Any representation or warranty made or deemed made by
     Borrowers in this Agreement or the Security agreement or which is contained
     in any certificate, document, opinion, or financial or other statement
     furnished at any time under or in connection with any Loan Document shall
     prove to have been incorrect, incomplete, or misleading in any material
     respect on or as of the date made or deemed made;

               (3)  Borrowers shall fail to perform or observe any term,
     covenant, or agreement contained in this Agreement or any Loan Documents
     and such default or breach shall have not been cured or remedied within the
     earlier of thirty (30) days after either of the Borrowers shall know (or
     should have known) of its occurrence or ten (10) days following receipt of
     notice thereof from the Bank;

               (4)  Either Borrower shall (a) fail to pay any indebtedness for
     borrowed money (other than the Note) or any interest or premium thereon,
     when due (whether by scheduled maturity, required prepayment, acceleration,
     demand, or otherwise); or (b) fail to perform or observe any term,
     covenant, or condition on its part required to be performed or observed
     under any agreement or instrument relating to any such indebtedness, when
     required to be performed or observed, if the effect of such failure to
     perform or observe is to accelerate, or to permit the acceleration of,
     after the giving of any applicable notice or passage of time, or both, the
     maturity of such indebtedness, whether or not such failure to perform or
     observe shall be waived by the holder of such indebtedness, or any such
     indebtedness shall be declared to be due and payable, or required to be
     prepaid (other than by a regularly scheduled required prepayment), prior to
     the stated maturity thereof;

               (5)  Either Borrower or any Guarantor (a) shall generally not
     pay, or shall be unable to pay, or shall admit in writing its inability to
     pay its debts as such debts become due; or (b) shall make an assignment for
     the benefit of creditors, or petition or apply to any tribunal for the
     appointment of a custodian, receiver, or trustee for it or a substantial
     part of its assets; or (c) shall commence any proceeding under any
     bankruptcy, reorganization, arrangement, readjustment of debt, dissolution,
     or liquidation law or statute of any jurisdiction, whether now or hereafter
     in effect; or (d) shall have had any such petition or application filed or
     any such proceeding commenced against it in which an order for relief is
     entered or an adjudication or appointment is made, and which remains
     undismissed for a period of thirty (30) days or more; or (e) shall take any
     corporate action indicating its consent to, approval of, or acquiescence in
     any such petition, application, proceeding, or order for relief or the
     appointment of a custodian, receiver, or trustee for all or any substantial
     part of its properties; or (f) shall suffer such custodianship,
     receivership, or trusteeship to continue undischarged for a period of
     thirty (30) days or more.

               (6)  One or more judgments, decrees, or orders for the payment of
     money in excess of Fifty Thousand and No/100 Dollars ($50,000.00) in the
     aggregate shall be rendered against either Borrower, and such judgments,
     decrees, or order shall

                                      -25-
<PAGE>
 
     continue unsatisfied and in effect for a period of twenty (20) consecutive
     days without being vacated, discharged, satisfied, or stayed or bonded
     pending appeal;

               (7)  The Collateral documents shall at any time after their
     execution and delivery and for any reason cease (a) to create a valid and
     perfected first priority security interest in and to the property purported
     to be subject to such Collateral documents; or (b) to be in full force and
     effect or shall be declared null and void, or the validity or
     enforceability thereof shall be contested by Borrowers, or Borrowers shall
     deny they have any further liability or obligation under the Collateral
     documents, or Borrowers shall fail to perform any of their obligations
     under the Collateral documents; or the Guaranty Agreement is declared null
     and void, or the validity or enforceability thereof shall be contested, or
     liability thereunder is denied;

               (8)  Any of the following events shall occur or exist with
     respect to either of the Borrowers and any Commonly Controlled Entity under
     ERISA: any Reportable Event shall occur; complete or partial withdrawal
     from any Multiemployer Plans shall occur; any Prohibited Transaction shall
     occur; a notice of intent to terminate a Plan shall be filed, or a Plan
     shall be terminated; or circumstances shall exist which constitute grounds
     entitling the PBGC to institute proceedings to terminate a Plan, or the
     PBGC shall institute such proceedings; and in each case above, such event
     or condition, together with all other events or conditions, if any, could
     subject Borrowers to any tax, penalty, or other liability which in the
     aggregate may exceed Fifty Thousand and No/100 Dollars ($50,000.00); or

               (9)  If the Bank receives its first notice of a material
     hazardous discharge or a material environmental complaint from a source
     other than Borrowers, and the Bank does not receive notice (which may be
     given in oral form, provided same is followed with all due dispatch by
     written notice by Certified Mail, Return Receipt Requested) of such
     hazardous discharge or environmental complaint from any Borrower within
     twenty-four (24) hours of the time the Bank first receives said notice from
     a source other than any Borrowers; or if any federal, state, or local
     agency asserts or creates a Lien upon any or all of the assets, equipment,
     property, leaseholds, or other facilities of the Borrowers by reason of the
     occurrence of a hazardous discharge or an environmental complaint; or if
     any federal, state, or local agency asserts a claim against Borrowers
     and/or their assets, equipment, property, leaseholds, or other facilities
     for damages or cleanup costs relating to a hazardous discharge or an
     environmental complaint; provided, however, that such claim shall not
     constitute a default if, within five (5) Business Days of the occurrence
     giving rise to the claim, (a) the Borrowers can prove to the Bank's
     satisfaction that the Borrowers have commenced and are diligently pursuing
     either: (i) a cure or correction of the event which constitutes the basis
     for the claim, and continues diligently to pursue such cure or correction
     to completion or (ii) proceedings for an injunction, a restraining order,
     or other appropriate relief preventing such agency or agencies from
     asserting such claim, which relief is granted within ten (10) Business Days
     of the occurrence giving rise to the claim and the injunction, order, or
     relief is not thereafter resolved or reversed on appeal; and (b) in either
     of the foregoing events, the

                                      -26-
<PAGE>
 
     Borrowers have posted a bond, letter of credit, or other security
     satisfactory in form, substance, and amount to both the Bank and the agency
     or entity asserting the claim to secure the proper and complete cure or
     correction of the event which constitutes the basis for the claim.

               (10) Norman H. Asbjornson shall own less than fifteen percent
     (15%) of the common stock of AAON (Nevada); or

               (11) AAON (Nevada) or any other guarantors of the Indebtedness
     revoke or renounce its guaranty; or

               (12) Any default or event of default occurs under any of the
     other Loan Documents, including without limitation, the Guaranty.

     In any such event, the Bank may:  (a) declare its obligation to make loans
or issue letters of credit to be terminated, whereupon the same shall forthwith
terminate; and/or (b) declare the outstanding Note, all interest thereon, and
all other amounts payable under this Agreement to be forthwith due and payable,
whereupon the Note, all such interest, and all such amounts shall become and be
forthwith due and payable, without presentment, demand, protest, or further
notice of any kind, all of which are hereby expressly waived by the Borrowers.
Additionally, the Bank is hereby authorized at any time and from time to time,
without further notice to Borrowers (any such notice being expressly waived by
the Borrowers), to set off and apply any and all deposits (general or special,
time or demand, provisional or final) at any time held and other indebtedness at
any time owing by the Bank to or for the credit or the account of the Borrowers
against any and all of the obligations of the Borrowers now or hereafter
existing under this Agreement or the Note or other Loan Documents, irrespective
of whether or not the Bank shall have made any demand under this Agreement or
the Note or such other Loan Document and although such obligations may be
unmatured.  The rights of the Bank under this Section are in addition to other
rights and remedies (including, without limitation, other rights of setoff)
which the Bank may have, in this Agreement, any other loan document or at law or
equity, including without limitation the right to accelerate the Note upon the
occurrence of a Matured Default.

     10.  MISCELLANEOUS.
          ------------- 

          10.1.  Amendments, etc.   No amendment, modification, termination,
                 ----------------                                           
or waiver of any provision of any Loan Document to which the Borrowers are a
party, nor consent to any departure by either of the Borrowers from any Loan
Document to which it is a party, shall in any event be effective unless the same
shall be in writing and signed by the Bank, and then such waiver or consent
shall be effective only in the specific instance and for the specific purpose
for which given.

          10.2.  Notices, etc.  All notices and other communications provided
                 -------------                                               
for under this Agreement and under the other Loan Documents to which the
Borrowers are a party shall

                                      -27-
<PAGE>
 
be in writing (including telegraphic, telex, and facsimile transmission) and
mailed or transmitted or delivered:

                 If to the Borrowers:                            
                                                                 
                 AAON, Inc.                                      
                 Attention: Norman H. Asbjornson, President      
                 2425 South Yukon                                
                 Tulsa, Oklahoma 74107                           
                                                                 
                 CP/AAON, Inc.                                   
                 Attention: Norman H. Asbjornson, President      
                 2425 South Yukon                                
                 Tulsa, Oklahoma 74107                           
                                                                 
                 If to Bank:                                     
                                                                 
                 Bank of Oklahoma, National Association          
                 Attention:  Denise L. Maltby, Vice President    
                 P. O. Box 2300                                  
                 Tulsa, Oklahoma  74192                           

or at such other address as shall be designated by such party in a written
notice to the other party complying as to delivery with the terms of this
Section 10.2.  Except as is otherwise provided in this Agreement, all such
notices and communications shall be effective when deposited in the mails
addressed as aforesaid, except that notices for advances to the Bank pursuant to
the provisions of Section 2.4 shall not be effective until received by the Bank.

          10.3.  No Waiver.  No failure or delay on the part of the Bank in
                 ---------                                                 
exercising any right, power or remedy hereunder shall operate as a waiver
thereof, nor shall any single or partial exercise of any such right, power, or
remedy preclude any other or further exercise thereof or the exercise of any
other right, power, or remedy hereunder.  The rights and remedies provided
herein are cumulative, and are not exclusive of any other rights, powers,
privileges, or remedies, now or hereafter existing, at law or in equity or
otherwise.

          10.4.  Successors and Assigns.  This Agreement shall be binding
                 ----------------------                                  
upon and inure to the benefit of the Borrowers and the Bank and their respective
successors and assigns, except that the Borrowers may not assign or transfer any
of their rights under any Loan Document to which the Borrowers are a party
without the prior written consent of the Bank.

          10.5.  Costs, Expenses and Taxes.  The Borrowers agree to pay on
                 -------------------------                                
demand all costs and expenses incurred by the Bank in connection with the
preparation, execution, delivery, filing, and initial administration of the Loan
Documents, including without limitation the fees of Riggs, Abney, Neal, Turpen,
Orbison & Lewis, and of any amendment, modification, or supplement to the Loan
Documents, including, without limitation, the fees and out-of-pocket

                                      -28-
<PAGE>
 
expenses of counsel for the Bank, incurred in connection with advising the Bank
as to its rights and responsibilities hereunder.  The Borrowers also agree to
pay all such costs, expenses and fees, including court costs, incurred in
connection with enforcement of the Loan Documents, or any amendment,
modification, or supplement thereto, whether by negotiation, legal proceedings,
or otherwise.  In addition, the Borrowers shall pay any and all stamp and other
taxes (but not mortgage registration taxes where local law prohibits Borrowers
from doing so) and fees payable or determined to be payable in connection with
the execution, delivery, filing, and recording of any of the Loan Documents and
the other documents to be delivered under any such Loan Documents, and agrees to
hold the Bank harmless from and against any and all liabilities with respect to
or resulting from any delay in paying or omission to pay such taxes and fees.
This provision shall survive termination of this Agreement.

          10.6.  Integration.  This Agreement and the Loan Documents contain
                 -----------                                                
the entire agreement between the parties relating to the subject matter hereof
and supersede all prior and contemporaneous oral statements and writings with
respect thereto.

          10.7.  Indemnity.  The Borrowers hereby agree to defend, indemnify,
                 ---------                                                   
and hold the Bank harmless from and against any and all claims, damages,
judgments, penalties, costs, and expenses (including attorney fees and court
costs now or hereafter arising from the aforesaid enforcement of this clause)
arising directly or indirectly from the activities of the Borrowers, its
predecessors in interest, or third parties with whom they have a contractual
relationship, or arising directly or indirectly from the violation of any
environmental protection, health or safety law, whether such claims are asserted
by any governmental agency or any other Person.  This indemnity shall survive
termination of this Agreement.

          10.8.  Governing Law.  This Agreement and the Note shall be
                 -------------                                       
governed by, and construed in accordance with, the laws of the State of
Oklahoma.

          10.9.  Severability of Provisions.  Any provision of any Loan
                 --------------------------                            
Documents which is prohibited or unenforceable in any jurisdiction shall, as to
such jurisdiction, be ineffective to the extent of such prohibition or
unenforceability without invalidating the remaining provisions of such Loan
Document or affecting the validity or enforceability of such provision in any
other jurisdiction.

          10.10. Headings.  Article and Section headings in the Loan
                 --------                                           
Documents are included in such Loan Documents for the convenience of reference
only and shall not constitute a part of the applicable Loan Documents for any
other purpose.

          10.11. Conflicts.  To the extent any conflict exists under any of
                 ---------                                                 
the Loan Documents, this Agreement shall be controlling.

                                      -29-
<PAGE>
 
     11.  Partial Collateral Release.  Bank and Borrowers acknowledge and agree
          --------------------------                                           
to the release of the following previously secured collateral, subject to
Borrowers pledge not to create, incur, permit or suffer to exist any liens or
encumbrances upon the following so long as any Note shall remain unpaid or Bank
shall have any outstanding Commitment under this Agreement:

          11.1.  Mortgage on AAON, Inc. - Oklahoma property, by execution of a
                 Release in form and content as set forth on Schedule "11.1"
                                                             ---------------
                 hereto;

          11.2.  Deed of Trust on CP/AAON, Inc. - Texas property, by execution
                 of a Release in form and content as set forth on Schedule
                                                                  --------
                 "11.2" hereto; and
                 ------

          11.3.  Furniture, fixtures and equipment as described in Security
                 Agreement and Assignment executed by Borrowers and Bank on June
                 8, 1992.

          11.4.  Pledge of stock by AAON-Nevada of its interest in 50,000 shares
                 of AAON and 25,000 shares of CP/AAON.

     12.  Participation.  The Borrowers recognize and acknowledge that the Bank
          -------------                                                        
may sell participating interests in the Note to one or more financial
institutions (the "Participants").  If there is only one Participant, upon
receipt of notice of the identity and address of such participant, the Borrowers
shall thereafter supply such Participant with the same information and reports
communicated to the Bank, whether written or oral.  The Borrowers hereby
acknowledge that each Participant shall be deem a holder of the Note to the
extent of its participation, and the Borrowers hereby waive their right, if any,
to offset amounts owing to the Borrowers from the Bank against any Participant's
portion of the Note.

     13.  Conditions Precedent.  The following conditions precedent must be
          --------------------                                             
satisfied on or before closing:

          13.1   Execution and delivery of this Agreement;

          13.2   Execution and delivery of the $12,150,000 Promissory Note;

          13.3   Execution and delivery of Security Agreement and UCC-1
                 (Oklahoma);

          13.4   Execution and delivery of Security Agreement and UCC-1 (Texas);

          13.5   Execution and delivery of Secretary's Certificate (AAON);

          13.6   Execution and delivery of Secretary's Certificate (CP/AAON);

          13.7   Execution and delivery of Secretary's Certificate (AAON-
                 Nevada);

          13.8   Execution and delivery of Release of Mortgage and Negative
                 Pledge (Oklahoma);

                                      -30-
<PAGE>
 
          13.9   Execution and delivery of Release of Deed of Trust and Negative
                 Pledge (Texas); and

          13.10  No Initial Default or Matured Default shall exist under the
                 Agreement.

     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed by their respective officers thereunto duly authorized, as of the date
first above written.

                              "Borrowers"

                              AAON, INC.


                              By  /s/ Norman H. Asbjornson
                                  ---------------------------------------
                                  Norman H. Asbjornson, President

                              CP/AAON, INC.


                              By  /s/ Norman H. Asbjornson
                                  ---------------------------------------
                                  Norman H. Asbjornson, President

                              "Bank"

                              BANK OF OKLAHOMA,
                              NATIONAL ASSOCIATION


                              By  /s/ Denise L. Maltby
                                  ---------------------------------------
                                  Denise L. Maltby, Vice President

                                      -31-


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