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): July 30, 2004



                                   AAON, INC.
                                   ----------
             (Exact name of registrant as specified in its charter)



           Nevada                       0-18953                  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


                                      -1-



Item 8.01.  Other Events.
            -------------

               Registrant  executed  a  Third  Restated  Revolving  Credit  Loan
               Agreement on July 30, 2004.


Item 9.01.  Financial Statements and Exhibits.
            ----------------------------------

               (c)  A copy of the Third Restated Revolving Credit Loan Agreement
                    is filed herewith as Exhibit 99.1.



                                   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:  August 26, 2004             By:       /s/ John B. Johnson, Jr.
                                       -----------------------------------
                                         John B. Johnson, Jr., Secretary


                                      -2-


                 THIRD RESTATED REVOLVING CREDIT LOAN AGREEMENT


     This Third Restated  Revolving Credit Loan Agreement is effective as of the
30th of July,  2004,  between AAON, INC., an Oklahoma  corporation  ("AAON") and
AAON COIL  PRODUCTS,  INC.,  a Texas  corporation  (formerly  known as  CP/AAON,
INC.)("CP/AAON")  (separately and  collectively,  the  "Borrower"),  and BANK OF
OKLAHOMA, N.A. ("Bank").

                                    RECITALS

         A.  Borrower 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 Borrower which was restated as evidenced by the
Second Restated Revolving Credit Loan Agreement Prime and LIBOR Pricing, dated
July 1, 1996, which was amended by a First Amendment dated June 30, 1997, a
Second Amendment dated June 30, 1998, a Third Amendment dated September 9, 1999,
the Fourth Amendment dated November 9, 1999, the Fifth Amendment dated July 27,
2000, the Sixth Amendment dated July 30, 2001, the Seventh Amendment dated
September 4, 2001, the Eighth Amendment dated July 30, 2002, and the Ninth
Amendment dated July 30, 2003 (as amended, the "Existing Credit Agreement"); and

         B.  Borrower has requested an extension of the $15,150,000.00 Revolving
Credit Loan and restatement thereof. Subject to the terms and conditions set
forth below, Bank has agreed to Borrower's request. This Agreement shall replace
the Existing Credit Agreement in its entirety.

                                    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 5.9, 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, Borrower; (ii)
which directly or indirectly beneficially owns or holds five percent (5%) or
more of any class of voting stock of Borrower; or (iii) five percent (5%) or
more of the voting stock of which is directly or indirectly beneficially owned
or held by Borrower. 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.

         1.3. "Agreement" means this Third Restated Revolving Credit Loan
Agreement, as amended, supplemented, or modified from time to time.


                                      -3-


         1.4. "Borrower's Authority Documents" shall mean, for each of the
Borrowers, the following: (i) a Certificate of Good Standing from each
Borrower's state of incorporation and such other states in which each Borrower
does business and is required to domesticate or otherwise register; (ii) a
certified copy of each Borrower's certificate of incorporation; (iii) a copy of
each Borrower's bylaws; and (iv) a certificate of the secretary of each
Borrower, in form and content set forth on Schedule "1.4(a)" and "1.4(b)"
hereto, certifying resolutions authorizing each Borrower to enter into the Loan.

         1.5. "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.

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

         1.7. "Commitment" means the Bank's obligation to make loans to the
Borrower pursuant to this Agreement.

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

         1.9. "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, 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.

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

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

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

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

         1.14. "Guaranty Agreement" means the Guaranty Agreement dated July 1,
1996, executed by the Guarantor, a copy of which is set forth on Schedule "1.14"
hereto.

         1.15. "Guarantor Authority Documents" shall mean the following: (i) a
Certificate of Good Standing from Guarantor's state of incorporation and such
other states in which Guarantor does business and is required to domesticate or
otherwise register; (ii) a certified copy of Guarantor's certificate of
incorporation; (iii) a copy of Guarantor's bylaws; and (iv) a certificate of the
secretary of Guarantor, in form and content set forth on Schedule "1.15" hereto,
certifying resolutions authorizing Guarantor to execute its ratification of the
Guaranty Agreement.


                                      -4-


         1.16. "Initial Default" means any of the events specified in Section 8,
whether or not any requirement for the giving of notice, the lapse of time, or
both, or any other condition has been satisfied.

         1.17. "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 Borrower 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:

                  1.17.1. No Interest Period may extend beyond the Termination
         Date; and

                  1.17.2. 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 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.

         1.18. "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 Borrower as the
office at which its Loans of such type are to be made and maintained.

         1.19. "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.

         1.20. "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.

         1.21. "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.

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

         1.23. "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.)

         1.24. "Loan" means advances under the $15,150,000 Revolving Line.

         1.25. "Loan Documents" means this Agreement, the Revolving Credit Note,
the Guaranty Agreement and all other instruments, documents or agreements
required under this Agreement.


                                      -5-


         1.26. "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.

         1.27. "Matured Default" means any of the events specified in Section 8,
provided that any requirement for the giving of notice, the lapse of time, or
both, or any other condition has been satisfied.

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

         1.29. "Opinion of Borrower's Counsel" means a legal opinion from each
Borrower's legal counsel in form and content acceptable to Lender.

         1.30. "Opinion of Guarantor's Counsel" means a legal opinion from
Guarantor's legal counsel in form and content acceptable to Lender.

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

         1.32. "Permitted Liens" means, as to Borrower 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 "1.32(6)";

                  (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 Borrower of the property or
         assets encumbered thereby in the normal course of its business or
         materially impair the value of the property subject thereto; and


                                      -6-


                  (8) Liens as to specific equipment created pursuant to
         permitted purchase money indebtedness permitted under Section 6.2.2.

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

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

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

         1.36. "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."

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

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

         1.39. "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 Borrower, including
agreements between Borrower and K-Mart Corporation or Wal-Mart Stores, Inc.,
including, without limitation, all employment agreements, sales contracts and
purchase orders.

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

         1.41. "Termination Date" means July 30, 2005.

         1.42. "EBITDA" means net income plus (i) interest expense, (ii)
depreciation, depletion, obsolescence and amortization of property (iii)
capitalized lease expense, and (iv) tax expense, all determined in accordance
with generally accepted accounting principles, consistently applied, and for a
particular period.

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 Borrower 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) FIFTEEN MILLION ONE HUNDRED FIFTY THOUSAND
AND NO/100 DOLLARS ($15,150,000.00) ("$15,150,000 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 Borrower 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.


                                      -7-


         2.2. Reduction of Commitment. The Borrower 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, without Bank's prior written consent.

         2.3. Notice and Manner of Borrowing. The Borrower 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 Borrower on the day of the
Loan request in immediately available funds by crediting the amount thereof to
the Borrower account with the Bank.

         2.4. Conversions and Renewals. The Borrower 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
Borrower 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.

         2.5. Interest. The Borrower 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 less one-half percent (1/2%), floating, per ---- annum;

                           (2) For a LIBOR Loan at a rate equal to the LIBOR
                  Interest Rate plus one and sixty-hundredths percent (1.60%)
                  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.


                                      -8-


                  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; and

                           (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.

         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 Borrower in substantially the form of Schedule
"2.6" duly completed, in the principal amount of FIFTEEN MILLION ONE HUNDRED
FIFTY THOUSAND AND NO/100 DOLLARS ($15,150,000.00), 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 (the "Revolving Credit
Note"). The Bank is hereby authorized by the Borrower 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 Borrower
under this Agreement or the Revolving Credit Note.

         2.7. Method of Payment. The Borrower shall make each payment under this
Agreement and under the Revolving Credit 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 Borrower hereby authorize the Bank, if and to
the extent payment is not made when due under this Agreement or under the
Revolving Credit Note, to charge from time to time against any account of the
Borrower with the Bank any amount so due. Whenever any payment to be made under
this Agreement or under the Revolving Credit 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.


                                      -9-


         2.8. Use of Proceeds. The proceeds of the Loans hereunder shall be used
by the Borrower to consolidate debt, fund working capital and be available for
standby and commercial letters of credit. The Borrower 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 Borrower 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 Borrower 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 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
Borrower, whereupon (a) the obligation of the Bank to make LIBOR Loans shall be
suspended until the Bank notifies the Borrower that the circumstances giving
rise to such suspension no longer exist; and (b) the Borrower 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 Borrower 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 Revolving Credit 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 Revolving Credit 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 Revolving Credit Note (or any of such extensions
of credit or liabilities). The Bank will notify the Borrower of any event
occurring after the date of this Agreement which will entitle the Bank to
compensation pursuant to this Section 2.11 as promptly as practicable after it
obtains knowledge thereof and determines to request such compensation.


                                      -10-


         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 Borrower 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 Borrower hereunder. The Bank will
notify the Borrower 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 Borrower
hereunder shall be conclusive, provided that such determinations are made on a
reasonable basis.

         2.13. Funding Loss Indemnification. The Borrower 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 Borrower 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.       CONDITIONS PRECEDENT.

         3.1. Conditions Precedent. The obligation of the Bank to make the
initial Revolving Credit Loan to Borrower 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:


                                      -11-


                  3.1.1. Note. The Revolving Credit Note duly executed by the
         Borrower.

                  3.1.2. Borrowers' Authority Documents.

                  3.1.3. Guarantor's Authority Documents.

                  3.1.4. Ratification of Guaranty. A ratification of the
         Guaranty Agreement duly executed by the Guarantor, in the form and
         content of Schedule "3.1.4", attached hereto.

                  3.1.5. Opinion of Borrowers' Legal Counsel.

                  3.1.6. Opinion of Guarantor's Legal Counsel.

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

         3.2. 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
         Borrower dated the date of such Revolving Credit Loan, stating that:

                           (a) The representations and warranties contained in
                  Section 4 of this 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.

4.       REPRESENTATIONS AND WARRANTIES. Each of the Borrower represents and
warrants to the Bank that:

         4.1. Incorporation, Good Standing, and Due Qualification. Each Borrower
is a corporation 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.

         4.2. Corporate Power and Authority. The execution, delivery, and
performance by each Borrower of the Loan Documents has 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 either
Borrower's 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
either Borrower; (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 either Borrower is 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 either Borrower; or (6) cause either Borrower 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.


                                      -12-


         4.3. 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 each Borrower, enforceable against each Borrower 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.

         4.4. Financial Statements. The balance sheets of each Borrower as of
December 31, 2003, the related statements of income and retained earnings of
Borrower for the twelve (12) months then ended, are complete and correct and
fairly present the financial condition of each Borrower at such date and the
results of the operations of each Borrower 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 either
Borrower. There are no liabilities of either Borrower, 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 either Borrower 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.

         4.5. 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.

         4.6. Other Agreements. Neither Borrower is a party 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 either Borrower or the ability of either Borrower 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.

         4.7. 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 Borrower
or the ability of either Borrower to perform their obligations under the Loan
Documents. Any litigation which does exist is set forth in detail satisfactory
to Bank on Schedule "4.7" hereto, but each Borrower represent to Bank that such
litigation does not violate this Section 4.7.

         4.8. Ownership and Liens. Each Borrower has 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 4.4, and none of the properties and
assets owned by either Borrower, and none of their leasehold interests, are
subject to any lien, except the Permitted Liens.


                                      -13-


         4.9. ERISA. Each Borrower is 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; each Borrower 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 Borrower nor any Commonly Controlled Entity has
incurred any liability to the PBGC under ERISA.

         4.10. Operation of Business. Each Borrower 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 neither Borrower is in violation of any valid
rights of others with respect to any of the foregoing.

         4.11. Taxes. Each Borrower has 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.

         4.12. Debt. Schedule "4.12" 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 each Borrower is 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 each Borrower, each Borrower shall promptly
notify Bank in the event any such obligation becomes non-contingent.

         4.13. Environment. Each Borrower has 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. Each Borrower has been issued and will
maintain all required federal, state, and local permits, licenses, certificates
and 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. Neither
Borrower has 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 each Borrower's
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
each Borrower 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 either Borrower or their business, operations, assets,
equipment, property, leaseholds, or other facilities. Neither Borrower has any
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).


                                      -14-


5.       AFFIRMATIVE COVENANTS. So long as the Revolving Credit Note shall
remain unpaid or the Bank shall have any Commitment under this Agreement,
Borrower will comply with the following:

         5.1. 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.

         5.2. 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.

         5.3. Maintenance of Properties. Each Borrower 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 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.

         5.4. Lockbox. Each Borrower 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) Borrower 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,
each Borrower 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 Borrower, 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.


                                      -15-


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

         5.6. Maintenance of Insurance. Each Borrower 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. 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. Each Borrower 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.

         5.7. 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.

         5.8. 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 representative thereof, to reasonably examine and make copies of
and abstracts from the records and books of account of, and visit the properties
of, each Borrower, and to discuss the affairs, finances, and accounts of
Borrower with any of their officers and directors and each Borrower's
independent accountants.

         5.9. Reporting Requirements. Furnish to Bank:

                  5.9.1. Financial Reports.

                           (a) Quarterly Financial Statements. Each Borrower
                  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 March 31, 2004, 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 one hundred twenty (120) days
                  thereafter, Borrower 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:


                                      -16-


                                    (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 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 each Borrower 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 each Borrower for the period
                  covered by the financial statements has been made under his
                  supervision with a view to determining whether each Borrower
                  has 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 each Borrower's 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 each Borrower 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
                  each Borrower's records by the party preparing such annual
                  statements.

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


                                      -17-


         5.10. 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 each Borrower's 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.

         5.11. Operating Accounts. Maintain its primary operating accounts at
Bank.

6.       NEGATIVE COVENANTS. So long as the Revolving Credit Note shall remain
unpaid or the Bank shall have any Commitment under this Agreement or any letter
of credit issued in connection herewith, neither Borrower will:

         6.1. 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.

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

                  6.2.1. Indebtedness arising out of this Agreement;

                  6.2.2. Purchase money indebtedness not to exceed $2,000,000 in
         the aggregate for any given fiscal year; provided that no such
         indebtedness shall be incurred so long as an Initial Default or Matured
         Default exists;

                  6.2.3. Current liabilities for taxes and assessments incurred
         in the ordinary course of business;

                  6.2.4. 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;

                  6.2.5. Unsecured Debt described in Schedule "4.12" but no
         voluntary prepayment, renewals, extensions, or refinancings thereof;

                  6.2.6. Unsecured non-Bank Debt in addition to the debt
         described in Schedule "4.12" not to exceed $100,000 for the Borrower in
         the aggregate in any given fiscal year; provided that no such
         indebtedness shall be incurred so long as an Initial Default or Matured
         Default exists; and

                  6.2.7. 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.


                                      -18-


         6.3. 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.

         6.4. 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.

         6.5. 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 Borrower; 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.

         6.6. 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.

         6.7. 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.

         6.8. Transactions with Affiliates. 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 Borrower,
except transactions (including, without limitation, an agreement to employ
Norman H. Asbjornson as President of Borrower and stock options provided to
senior management) in the ordinary course of the business of Borrower and upon
fair and reasonable terms no less favorable than Borrower would obtain in a
transaction for the same purpose with a Person that is not an Affiliate of
either of the Borrower, and Borrower shall not in any case pay to AAON (Nevada)
in excess of $100,000 in any one fiscal year of Borrower for goods furnished and
services rendered by AAON (Nevada) to Borrower.

7.       FINANCIAL COVENANTS. So long as the Revolving Credit Note shall remain
unpaid or the Bank shall have any Commitment under this Agreement, each Borrower
shall comply with the following on a consolidated basis:

         7.1. Tangible Net Worth. The Borrower covenant and agree to maintain a
Tangible Net Worth which, when consolidated with the Tangible Net Worth of AAON
(Nevada), shall at all times exceed $30,000,000.

         7.2. Total Liabilities to Tangible Net Worth. The Borrower 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 2.0 to
1.0.


                                      -19-


         7.3. Working Capital. The Borrower 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 (excluding the outstanding balance
of the Revolving Credit Note).

8.       EVENTS OF DEFAULT.

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

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

                  8.1.2. Any representation or warranty made or deemed made by
         either Borrower in this 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;

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

                  8.1.4. Either Borrower shall (a) fail to pay any indebtedness
         for borrowed money (other than the Revolving Credit 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;

                  8.1.5. Either Borrower or 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.


                                      -20-


                  8.1.6. 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 continue
         unsatisfied and in effect for a period of twenty (20) consecutive days
         without being vacated, discharged, satisfied, or stayed or bonded
         pending appeal;

                  8.1.7. The Guaranty Agreement is declared null and void, or
         the validity or enforceability thereof shall be contested, or liability
         thereunder is denied;

                  8.1.8. Any of the following events shall occur or exist with
         respect to either of the Borrower 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 Borrower to any tax,
         penalty, or other liability which in the aggregate may exceed Fifty
         Thousand and No/100 Dollars ($50,000.00); or

                  8.1.9. If the Bank receives its first notice of a material
         hazardous discharge or a material environmental complaint from a source
         other than Borrower, 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 Borrower; 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 Borrower 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 Borrower 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
         Borrower can prove to the Bank's satisfaction that the Borrower 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 Borrower 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.

                  8.1.10. Norman H. Asbjornson shall own less than twenty-five
         percent (25%) of the common stock of AAON (Nevada); or


                                      -21-


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

                  8.1.12. 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 Revolving Credit Note, all interest
thereon, and all other amounts payable under this Agreement to be forthwith due
and payable, whereupon the Revolving Credit 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 Borrower. Additionally, the Bank is hereby authorized at
any time and from time to time, without further notice to Borrower (any such
notice being expressly waived by the Borrower), 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 Borrower against any and all of the obligations of the
Borrower now or hereafter existing under this Agreement or the Revolving Credit
Note or other Loan Documents, irrespective of whether or not the Bank shall have
made any demand under this Agreement or the Revolving Credit 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 Revolving Credit Note upon the occurrence
of a Matured Default.

9.       MISCELLANEOUS.

         9.1. Amendments, etc. No amendment, modification, termination, or
waiver of any provision of any Loan Document to which the Borrower are a party,
nor consent to any departure by either of the Borrower 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.

         9.2. Notices, etc. All notices and other communications provided for
under this Agreement and under the other Loan Documents to which the Borrower
are a party shall be in writing (including telegraphic, telex, and facsimile
transmission) and mailed or transmitted or delivered:

         If to the Borrower:

         AAON, Inc.
         Attention: Norman H. Asbjornson, President
         2425 South Yukon
         Tulsa, Oklahoma 74107

         AAON Coil Products, Inc.
         Attention: Norman H. Asbjornson, President
         2425 South Yukon
         Tulsa, Oklahoma 74107


                                      -22-


         If to Bank:

         Bank of Oklahoma, N.A.
         Attention:  Jamey C. Webb, Assistant 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 9.2. 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.

         9.3. 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.

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

         9.5. Costs, Expenses and Taxes. The Borrower 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 expenses of counsel
for the Bank, incurred in connection with advising the Bank as to its rights and
responsibilities hereunder. The Borrower 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 Borrower shall pay any and all stamp and other taxes (but not mortgage
registration taxes where local law prohibits Borrower 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.

         9.6. 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.

         9.7. Indemnity. The Borrower 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 Borrower, 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.


                                      -23-


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

         9.9. 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.

         9.10. 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.

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

                  9.11.1. Participation. The Borrower recognizes and
         acknowledges that the Bank may sell participating interests in the
         Revolving Credit 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 Borrower
         shall thereafter supply such Participant with the same information and
         reports communicated to the Bank, whether written or oral. The Borrower
         hereby acknowledge that each Participant shall be deem a holder of the
         Revolving Credit Note to the extent of its participation, and the
         Borrower hereby waive their right, if any, to offset amounts owing to
         the Borrower from the Bank against any Participant's portion of the
         Revolving Credit Note.

         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.


                               "Bank"

                               BANK OF OKLAHOMA, N.A.


                               By   /s/ Jamey C. Webb
                                 ----------------------------------------------
                                   Jamey C. Webb, Assistant Vice President

                               "Borrower"

                               AAON, INC., an Oklahoma corporation


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


                                      -24-


                               AAON COIL PRODUCTS, INC., a Texas
                               corporation (formerly known as CP/AAON, Inc.)


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


                                      -25-


                                 PROMISSORY NOTE


$15,150,000                                                        July 30, 2004
                                                                 Tulsa, Oklahoma


         FOR VALUE RECEIVED, the undersigned, AAON, INC., an Oklahoma
corporation and AAON COIL PRODUCTS, INC., a Texas corporation (formerly known as
CP/AAON, Inc.) (separately and collectively "Maker"), jointly and severally
promise to pay to the order of BANK OF OKLAHOMA, N.A. ("Lender"), at its offices
in Tulsa, Oklahoma, the principal sum of FIFTEEN MILLION ONE HUNDRED FIFTY
THOUSAND DOLLARS ($15,150,000), or, if less, the aggregate sum of advances made
by Lender to Maker under the Third Restated Revolving Credit Agreement of even
date herewith ("Credit Agreement"), as follows:

         a.       Principal. Principal shall be payable on July 30, 2005.

         b.       Interest. Interest shall be payable on the last day of each
                  month (except for interest on LIBOR Loans which shall be
                  payable on the last day of the applicable Interest Period) and
                  at maturity, commencing August 31, 2004, based upon the type
                  of loan and interest rate related thereto as more specifically
                  described in the Credit Agreement, which terms are
                  incorporated herein by reference.

         This Note is the "Revolving Credit Note" referred to in the Credit
Agreement. Reference is made to the Credit Agreement for provisions for interest
accrual, the interest rate, the payment and prepayment hereof and for the
acceleration of the maturity hereof, all of which are incorporated herein and
made a part hereof. Terms defined in said Credit Agreement are used herein as
therein defined.

         All payments under this Note shall be made in legal tender of the
United States of America or in other immediately available funds at Lender's
office described above, and no credit shall be given for any payment received by
check, draft of other instrument or item until such time as the holder hereof
shall have received credit therefor from the holder's collecting agent, or, in
the event no collecting agent is used, from the bank or other financial
institution upon which said check, draft of other instrument or item is drawn.

         From time to time the maturity date of this Note may be extended or
this Note may be renewed, in whole or in part, or a new note of different form
may be substituted for this Note and/or the rate of interest may be changed, or
changes may be made in consideration of loan extensions, and the holder, from
time to time, may waive or surrender, either in whole or in part, any rights,
guarantees, security interests or liens given for the benefit of the holder in
connection herewith; but no such occurrences shall in any manner affect, limit,
modify or otherwise impair any rights, guarantees or security of the holder not
specifically waived, released or surrendered in writing, nor shall any maker,
guarantor, endorser or any person who is or might be liable hereon, either
primarily or contingently, be released from such liability by reason of the
occurrence of any such event. The holder hereof, from time to time, shall have
the unlimited right to release any person who might be liable hereon; and such
release shall not affect or discharge the liability of any other person who is
or might be liable hereon.


                                      -26-


         The Maker and any endorsers, guarantors and sureties hereby severally
waive protest, presentment, demand, and notice of protest and nonpayment in case
this Note or any payment due hereunder is not paid when due; and they agree to
any renewal, extension, acceleration, postponement of the time of payment,
substitution, exchange or release of collateral and to the release of any party
or person primarily or contingently liable without prejudice to the holder and
without notice to the Maker or any endorser, guarantor or surety. Maker and any
guarantor, endorser, surety or any other person who is or may become liable
hereon will, on demand, pay all costs of collection, including reasonable
attorney fees of the holder hereof in attempting to enforce payment of this Note
and reasonable attorney fees for defending the validity of any document securing
this Note as a valid first and prior lien.

         This Note is given for an actual loan of money for business purposes
and not for personal, agricultural or residential purposes, and is executed and
delivered in the State of Oklahoma and shall be governed by and construed in
accordance with the laws of the State of Oklahoma.

         This Note is an extension and renewal of the $15,150,000 Promissory
Note dated effective July 30, 2003 between Maker and Lender and shall be deemed
effective as of the date set forth as the date such Promissory Note would have
matured if not otherwise renewed or extended hereby.

                                    AAON, INC., an Oklahoma corporation



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

                                    AAON COIL PRODUCTS, INC.
                                    a Texas corporation (formerly known as
                                    CP/AAON, Inc.)



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


                                      -27-


                       RATIFICATION OF SUBSIDIARY GUARANTY


         An inducement for and in consideration of the Bank to execute the Third
Restated Revolving Credit Loan Agreement of even date herewith between AAON,
INC., an Oklahoma corporation ("AAON") and AAON COIL PRODUCTS, INC., a Texas
corporation (formerly known as CP/AAON, INC.)("CP/AAON") (separately and
collectively, the "Borrower"),. and BANK OF OKLAHOMA, N.A. (Bank"), the
undersigned Guarantor hereby ratifies and confirms the Guaranty Agreement dated
July 1, 1996, and agree that it remains in full force and effect.

         Dated effective this 30th day of July, 2004.

         IN WITNESS WHEREOF, the Guarantor has caused this Ratification of
Guaranty to be duly executed, under seal, by its authorized officer as of the
day and year first above written.

                                    AAON, INC., a Nevada corporation



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


                                      -28-