Document:

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                                                                   EXHIBIT 10.51

                   STOCK SALE AND DEBT CANCELLATION AGREEMENT

          This agreement (the "Agreement") is made as of the 12th day of
September, 2002 by and between CECO Filters, Inc., a Delaware corporation (the
"Seller"), CECO Group, Inc., a Delaware corporation ("Group) and CECO
Environmental Corp., a Delaware corporation (the "Purchaser").

          A.   Purchaser currently owns ninety-three and ninety-five one
hundredths percent (93.95%) of the issued and outstanding common stock of
Seller.

          B.   Group is a wholly-owned subsidiary of Purchaser.

          C.   The Seller is justly indebted to Purchaser and Group in an amount
in excess of $3,153,644 (the "Debt").

          D.   The Seller desires to sell 31,536,440 newly-issued shares of
common stock (the "Shares") representing eighty-two and twelve one hundredths
percent (82.12%) of the issued and outstanding shares of the common stock of the
Seller immediately after the purchase and sale contemplated herein, in exchange
for the cancellation of a certain portion of the Debt of Seller to Purchaser and
Group.

                                    AGREEMENT

          NOW, THEREFORE, in consideration of the mutual representations,
warranties and undertakings contained herein, the parties hereto agree as
follows:

          1.   Sale and Purchase of Shares. In accordance with the terms and
subject to the conditions contained herein, the Purchaser hereby agrees to
purchase from the Seller and the Seller hereby agrees to sell to the Purchaser
the 31,536,440 Shares for a price of $0.10 per share and an aggregate of
$3,153,644 in satisfaction of $3,153,644 of the Debt representing $3,044,423
owed by Seller to Group and $109,221 owed by Seller to Purchaser (the "Purchase
Price").

          2.   The Closing.

               2.1  Delivery by Seller. At the closing (the "Closing") of the
transaction contemplated herein, the Seller shall deliver to the Purchaser
certificates representing the Shares ("Certificates") and the Purchaser and
Group shall deliver to the Seller releases in the forms of Exhibit A and Exhibit
B (the "Releases"). The Closing shall take place at such time and place as the
Seller and Purchaser shall mutually agree.

          3.   Representation and Warranties of the Seller. The Seller hereby
represents and warrants to the Purchaser and Group as follows:

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               3.1  The Seller. The Seller is a corporation duly organized,
validly existing and in good standing under the laws of the State of Delaware
and has all requisite right, power and authority necessary to own, lease and
operate all of its property and to carry on its business as it is now being
carried on. The Seller has taken all actions necessary to permit it lawfully to
do business in all jurisdictions where it is currently conducting its business.

               3.2  Authority Relative to the Contracts. The Seller has the
authority to enter into this Agreement. This Agreement has been duly executed
and delivered by the Seller and is a valid and binding Agreement of the Seller
enforceable in accordance with its terms, except as such enforcement is subject
to bankruptcy, insolvency, reorganization or other laws relating to or affecting
the enforcement of creditors' rights generally.

               3.3  No Violation or Conflict. Neither the execution nor the
consummation of this Agreement by the Seller nor the consummation of the
transactions contemplated herein, nor compliance by the Seller with any
provisions hereof, will violate any provision of the certificate of
incorporation or by-laws of the Seller or violate or result, with the giving of
notice or lapse of time, or both, in a violation of or result in the
acceleration of or entitle any party to accelerate (whether after the giving of
notice or lapse of time or both) any obligation under, or result in the creation
or imposition of any lien, charge, pledge, security interest or other
encumbrance upon the property of the Seller pursuant to any provision of any
contract, agreement, note, mortgage, lien, indenture, license, lease, other
instrument, law, ordinance, regulation, arbitration, order, judgment or decree
to which the Seller is a party or by which it, or its property is bound, or
permit the termination of any agreement, instrument, lien, license, lease or
mortgage to which the Seller is a party. The execution, delivery and performance
of this Agreement and the consummation of transactions contemplated hereby and
thereby will not (i) violate or conflict with any federal or state securities
laws or regulations or any other statute or regulation, order, judgment,
injunction award or decree of any court, arbitrator or governmental or
regulatory body against, or binding upon or applicable to the Seller or upon the
securities, properties or business of the Seller; nor (ii) require the approval
or consent of any foreign, federal, state, county, local or other governmental
or regulatory body or the approval or consent of any other person.

               3.4  Court Orders, Decrees and Laws. There is no outstanding or,
to the Seller's knowledge threatened, order, writ, injunction or decree of any
court, government agency or arbitrational tribunal against or affecting the
Seller or any of its assets that would significantly interfere with the Seller's
ability to consummate the transactions contemplated by this Agreement.

               3.5  Absence of Litigation. There is no action, suit, proceeding,
claim, arbitration or investigation pending or, to the best knowledge of the
Seller, threatened or contemplated by any person including, without limitation
any governmental or regulatory agency, against the Seller or with respect to the
assets of the Seller or which seeks to prohibit, restrict or delay consummation
of this Agreement or the transactions contemplated hereby. There is no factual
basis known to the Seller which is known to present a possibility for any such
action, suit, proceeding, claim, arbitration or investigation.

               3.6  Encumbrances. The Shares when issued to the Purchaser will
be free and clear of all liens, charges, encumbrances, security interests and
claims whatsoever, including

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without limitation, pre-emptive rights or claims or rights under "buy-sell" or
other similar agreements.

               3.7  Capitalization. Immediately prior to the closing of the
purchase and sale of the Shares contemplated by this Agreement, the share
capital of the Seller is as follows: the number of authorized, and issued and
outstanding shares of capital stock of the Seller is 100,000,000 authorized
shares consisting of 99,000,000 shares of common stock (the "Common Stock"), of
which 6,867,667 are issued and outstanding and 1,000,000 of preferred stock, of
which no shares are issued and outstanding. The outstanding shares of Common
Stock are duly and validly authorized and issued, fully paid and non-assessable.
Immediately after the closing of the purchase and sale of the shares
contemplated by this Agreement, Seller will have 38,404,107 shares of common
stock issued and outstanding. Other than this Agreement, there are no
outstanding subscriptions, options, warrants, calls, commitments, or other
rights (including conversion or preemptive rights) or agreements for the
purchase or acquisition from the Seller of any shares of its capital stock. The
Seller is not a party or subject to any agreement or understanding, and, to the
best of knowledge the Seller, there is no agreement or understanding between any
persons and/or entities, which in either case affects or relates to the voting
or giving of written consents with respect to any security or by a director of
the Seller. There are no preemptive rights with respect to the issuance or sale
of the Seller's capital stock. There are no restrictions on the transfer of the
Seller's capital stock other than those arising from federal and state
securities laws.

          4.   Representations, Warranties and Covenants of the Purchaser. The
Purchaser hereby represents and warrants to the Seller as follows:

               4.1  The Purchaser. The Purchaser is a corporation duly
organized, validly existing and in good standing under the laws of the State of
Delaware and has all requisite right, power and authority necessary to own,
lease and operate all of its property and to carry on its business as it is now
being carried on. The Purchaser has taken all actions necessary to permit it
lawfully to do business in all jurisdictions where it is currently conducting
its business.

               4.2  Authority Relative to this Agreement. The Purchaser has the
authority to enter into this Agreement. This Agreement has been duly executed
and delivered, and is the legally valid and binding obligation of the Purchaser,
enforceable in accordance with its terms, except as such enforcement is subject
to bankruptcy, insolvency, reorganization or other laws relating to or affecting
the enforcement of creditors' rights generally.

               4.3  No Violation or Conflict. Neither the execution nor the
consummation of this Agreement by the Purchaser nor the consummation of the
transactions contemplated herein, nor compliance by the Purchaser with any
provisions hereof, will violate any provision of the certificate of
incorporation or by-laws of the Purchaser or violate or result, with the giving
of notice or lapse of time, or both, in a violation of or result in the
acceleration of or entitle any party to accelerate (whether after the giving of
notice or lapse of time or both) any obligation under, or result in the creation
or imposition of any lien, charge, pledge, security interest or other
encumbrance upon the property of the Purchaser pursuant to any provision of any
contract, agreement, note, mortgage, lien, indenture, license, lease, other
instrument, law, ordinance, regulation, arbitration, order, judgment or decree
to which the Purchaser is a party or by which it, or its property is bound, or
permit the

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termination of any agreement, instrument, lien, license, lease or mortgage to
which the Purchaser is a party.

               4.4  Court Orders, Decrees and Laws. There is no outstanding, or
to the Purchaser's knowledge threatened, order, writ, injunction or decree of
any court, government agency or arbitrational tribunal against or affecting the
Purchaser or any of its assets that would significantly interfere with the
Purchaser's ability to consummate the transactions contemplated by this
Agreement.

               4.5  Fully Informed. Purchaser is the majority shareholder of the
Company and (i) has full access to all Company books and records, (ii) has full
knowledge of the Company's affairs, and (iii) is fully satisfied that it is an
informed purchaser.

               4.6  Ownership of Debt. The Purchaser has good and marketable
title to the Debt and has neither transferred nor assigned it. The Debt is not
evidenced by a promissory note or any other negotiable or written instrument.

          5.   Representations, Warranties and Covenants of Group. Group hereby
represents and warrants to the Seller as follows:

               5.1  Group. Group is a corporation duly organized, validly
existing and in good standing under the laws of the State of Delaware and has
all requisite right, power and authority necessary to own, lease and operate all
of its property and to carry on its business as it is now being carried on.
Group has taken all actions necessary to permit it lawfully to do business in
all jurisdictions where it is currently conducting its business.

               5.2  Authority Relative to this Agreement. Group has the
authority to enter into this Agreement. This Agreement has been duly executed
and delivered, and is the legally valid and binding obligation of the Purchaser,
enforceable in accordance with its terms, except as such enforcement is subject
to bankruptcy, insolvency, reorganization or other laws relating to or affecting
the enforcement of creditors' rights generally.

               5.3  No Violation or Conflict. Neither the execution nor the
consummation of this Agreement by Group nor the consummation of the transactions
contemplated herein, nor compliance by Group with any provisions hereof, will
violate any provision of the certificate of incorporation or by-laws of Group or
violate or result, with the giving of notice or lapse of time, or both, in a
violation of or result in the acceleration of or entitle any party to accelerate
(whether after the giving of notice or lapse of time or both) any obligation
under, or result in the creation or imposition of any lien, charge, pledge,
security interest or other encumbrance upon the property of Group pursuant to
any provision of any contract, agreement, note, mortgage, lien, indenture,
license, lease, other instrument, law, ordinance, regulation, arbitration,
order, judgment or decree to which Group is a party or by which it, or its
property is bound, or permit the termination of any agreement, instrument, lien,
license, lease or mortgage to which Group is a party.

               5.4  Court Orders, Decrees and Laws. There is no outstanding, or
to Group's knowledge threatened, order, writ, injunction or decree of any court,
government agency or

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arbitrational tribunal against or affecting Group or any of its assets that
would significantly interfere with Group's ability to consummate the
transactions contemplated by this Agreement.

          6.   Conditions Precedent to Obligations of the Purchaser and Group.
Consummation of the transaction contemplated hereby on the parts of the
Purchaser and Group is subject to the fulfillment, to the reasonable
satisfaction of the Purchaser and Group of each of the following conditions:

               6.1  Representations True at Closing. The representations and
warranties of the Seller contained in Section 3 of this Agreement shall be true
in all material respects on the date hereof and at the time of the delivery of
the Certificates and the Release.

               6.2  Litigation. No litigation or proceeding shall be pending or
threatened to restrain, set aside or invalidate the transactions contemplated by
this Agreement.

               6.3  Resolutions. Copies of the resolutions of the directors of
the Seller authorizing the execution, delivery and performance of this Agreement
and the transactions contemplated shall be delivered to Purchaser at or prior to
the Closing.

          7.0  Conditions Precedent to Obligations of the Seller. Consummation
of the transactions contemplated hereby on the part of the Seller is subject to
the fulfillment, to the reasonable satisfaction of the Seller of each of the
following conditions:

               7.1  Representations True at Closing. The Purchaser's and Group's
respective representations and warranties contained in Section 4 and Section 5
of this Agreement shall be true in all material respects at the date hereof and
at the time of the delivery of the Certificates and the Releases.

               7.2  Litigation. No litigation or proceeding shall be pending or
threatened to restrain, set aside or invalidate the transactions contemplated by
this Agreement.

               7.3  Resolutions. Copies of the resolutions of the directors of
the Purchaser and Group authorizing the execution, delivery and performance of
this Agreement and the transactions contemplated hereby shall be delivered to
Seller at or prior to the Closing.

          8.0  Survival of Representations, Warranties, Covenants and
Agreements. All warranties, representations, covenants and agreements made
hereunder shall survive the Closing for a period of 18 months.

          9.   Miscellaneous. It is the understanding of the parties hereto
that:

               9.1  Waiver. Any party may, at its option, waive in writing any
or all of the conditions herein contained to which its obligations hereunder are
subject. Only written waivers are valid.

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               9.2  Expenses. Each party hereto shall bear its own expenses in
connection with this Agreement and the transactions contemplated herein.

               9.3  Entire Agreement. This Agreement sets forth the entire
understanding of the parties and supersedes all prior agreements, arrangements
and communications, whether oral or written, with respect to the subject matter
hereof. This Agreement shall not be modified or amended except by written
agreement of the parties hereto. Captions appearing in this Agreement are for
convenience only and shall not be deemed to explain, limit or amplify the
provisions or contents hereof.

               9.4  Severability. The invalidity or unenforceability of any
particular provision of this Agreement shall not affect the other provisions
hereof, and this Agreement shall be deemed modified in a legally permissible
manner so as to give maximum effect to the intention of the parties and the
economic arrangements to which they agreed.

               9.5  Binding Effect; Assignment. All the terms, provisions,
covenants and conditions of this Agreement shall be binding upon and inure to
the benefit of and be enforceable by the parties hereto and their respective
heirs and successors. This Agreement and the rights and obligations of the
parties hereto shall not be assigned or delegated by any party hereto without
the written consent of the other parties hereto.

               9.6  Notices. Any notice or other instrument or thing required or
permitted to be given, served or delivered to any of the parties hereto shall be
in writing and shall be considered given when hand-delivered to the recipient or
when deposited with the U.S. Postal Service, using certified mail, postage
prepaid, addressed to the recipient at:

               The Seller:

                    CECO ENVIRONMENTAL CORP.
                    3120 Forrer Street
                    Cincinnati, OH  45209
                    Attention: Marshall Morris

               The Purchaser:

                    CECO FILTERS, INC.
                    3120 Forrer Street
                    Cincinnati, OH 45209

               Group:

                    CECO GROUP, INC.
                    3120 Forrer Street
                    Cincinnati, OH  45209
                    Attention: Marshall Morris

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or at such other address as a party may designate to another party in accordance
with the terms of this Section 9.6.

               9.7  Governing Law. This Agreement shall be governed by and
construed in accordance with the internal laws (as opposed to its rules
governing conflicts of laws) of the State of Delaware.

               9.8  Counterparts. This Agreement may be executed in
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.

               9.9  Legend. A legend substantially in the following form will be
placed on the certificate representing the Shares:

               "The securities represented hereby have not been registered under
               the Securities Act of 1933 (the "Act") or the securities laws of
               any state. Such securities may not be offered for sale, sold,
               transferred, pledged or hypothecated in the absence of effective
               registration statements covering such shares under the Act any
               applicable state securities laws, or, if requested by the issuer,
               an opinion of counsel satisfactory to the issuer that such
               registration is not required."

               9.10 Recitals. The recitals to this Agreement are incorporated
into this Agreement.

                            [signature page follows]

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               IN WITNESS WHEREOF, the parties hereto have executed this
Agreement as of the date first set forth above.

                                        CECO FILTERS, INC.

                                        By: /s/ Michael Meyer
                                            -----------------

                                            Its: President

                                        CECO GROUP, INC.

                                        By: /s/ Marshall J. Morris
                                            ----------------------

                                            Its: CFO

                                        CECO ENVIRONMENTAL CORP.

                                        By: /s/ Richard J. Blum
                                            -------------------

                                            Its: President

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                                    EXHIBIT A

          CECO Environmental Corp. ("CECO") hereby releases CECO Filters, Inc.,
a Delaware corporation ("Filters"), from all liability with respect to a portion
of that certain indebtedness of $109,221 (the "Debt") owed to CECO. This release
covers principal of $109,221, and does not include debt of Filters to CECO that
remains outstanding as of the date hereof in the principal amount of $500,000,
which amount bears interest at 10% per annum.

          The undersigned hereby agrees to execute such other documents and to
do such other acts as Filters may reasonably request in order to more fully
carry out the foregoing release.

          IN WITNESS WHEREOF, the undersigned caused this Agreement to be
executed as of this ______ day of __________, 2002.

                                        CECO ENVIRONMENTAL CORP.

                                        By:    /s/ Richard J. Blum
                                               -------------------

                                        Title: President

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                                    EXHIBIT B

          CECO Group, Inc. ("Group") hereby releases CECO Filters, Inc., a
Delaware corporation ("Filters"), from all liability with respect to a portion
of that certain indebtedness of $3,044,423 (the "Debt") owed to GROUP. This
release covers principal of $3,044,423. There is no debt of Filters to GROUP
that remains outstanding after the release of said amount as of the date hereof.

          The undersigned hereby agrees to execute such other documents and to
do such other acts as Filters may reasonably request in order to more fully
carry out the foregoing release.

          IN WITNESS WHEREOF, the undersigned caused this Agreement to be
executed as of this ______ day of ___________, 2002.

                                        CECO GROUP, INC.

                                        By:    /s/ Marshall J. Morris
                                               ----------------------

                                        Title: CFO

                                       10<PAGE>
                                                                   EXHIBIT 10.52

* CONFIDENTIAL INFORMATION HAS BEEN OMITTED PURSUANT TO A REQUEST FOR
CONFIDENTIAL TREATMENT AND HAS BEEN FILED SEPARATELY WITH THE SECURITIES AND
EXCHANGE COMMISSION.

                               PURCHASE AGREEMENT

          This Purchase Agreement ("Agreement") is made as of the 11th day of
February, 2003, (hereinafter the "date of this Agreement") CINCINNATI GALLERIA,
LLC, an Ohio limited liability company ("Purchaser") and THE KIRK & BLUM
MANUFACTURING COMPANY, an Ohio corporation ("Seller").

          1.   Property. Seller agrees to sell and convey to Purchaser, on the
terms and subject to the conditions contained in this Agreement, the land as
approximately shown on Exhibit A attached hereto and made a part hereof, which
contains approximately 10.7298 acres together with all improvements located
thereon, and together with any and all appurtenant rights and easements
(collectively, the "Property"). Notwithstanding the foregoing, Seller, at its
sole discretion, may remove any property from the Property, whether such
Property may be considered personal property, real property or a fixture,
including without limitation cranes, conveyors, electric bus ducts and all other
property on the Property (in accordance with the terms of Section 5 of this
Agreement).

          2.   Purchase Price. The Purchase Price ("Purchase Price") for the
Property shall be *                    ($      *      ) The Purchase Price shall
be payable as follows:

               (a)  Unless Purchaser sooner terminates this Agreement or closes,
which Purchaser shall have the right to do, then Purchaser shall pay to Seller
     *     payments in the amount of * (the "Deposit(s)") on or before     *
to be applied to the Purchase Price due at "Closing" (as hereinafter defined);
and

               (b)  The remainder of the Purchase Price, subject to any credits
or prorations provided for by the terms of this Agreement and a credit for the
Deposit shall be payable at the Closing by certified or cashier's check, title
company escrow check or by wire of immediately available funds.

          3.   Conveyance. At the Closing, Seller shall deliver to Purchaser a
duly executed and acknowledged limited warranty deed (the "Deed"), conveying to
Purchaser recordable, marketable, and indefeasible title to the Property in fee
simple, free and clear of all liens and encumbrances, of record and in fact,
subject only to the following ("Permitted Exceptions"): (a) easements,
encumbrances and restrictions of record (but, in any event, Seller shall be
required to remove all mortgages and other monetary liens, except for real
estate taxes and installments of assessments not yet due and payable); (b)
installments of real estate taxes and assessments which are a lien upon the
Property, but not yet due and payable; (c) Seller's post Closing occupancy
rights; and (d) the rights

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of property owners in and to private roadways pursuant to recorded documents,
public highways, public right of ways and rights of the public to utilize
streets, as described herein.

          4.   Inspection.

               (a)  Property Inspection. Seller shall make the Property
available for inspection by Purchaser, its agents and employees from the date of
this Agreement through the date of Closing, and Purchaser may undertake at
Purchaser's sole expense, as complete a physical and environmental inspection
and investigation of the Property and the circumstances surrounding the Property
as Purchaser deems appropriate in order to determine that the Property is
suitable for the development, construction, operation and use of a commercial
project, together with and in conjunction with adjacent real property being
acquired by Purchaser (the "Project"). Purchaser agrees to restore the Property
to its original condition upon completion of any such inspections, and to
indemnify Seller against all damages incurred by Seller as a result of the entry
upon the Property by Purchaser's agents or employees. Purchaser shall, promptly
after receipt, provide Seller with copies of all inspection reports regarding
the physical condition of the Property as generated pursuant to this Section.

               (b)  Title and Survey. Prior to May 31, 2003, Purchaser shall
obtain at Purchaser's expense a title insurance commitment ("Title Commitment")
from Lawyers Title of Cincinnati, Inc. as agent for Lawyers Title Insurance
Corporation (the "Title Company"). In addition, Purchaser may obtain a survey
(the "Survey") of the Property prepared by a registered land surveyor, which
Survey shall be certified to Purchaser and to the Title Company in the form
required by Purchaser and/or the Title Company. The Survey may also (i) show the
present location of any improvements on the Property, including any
encroachments onto adjoining land and encroachments by adjoining improvements
onto the Property; (ii) show all easements whether recorded or visible; (iii)
show access to public roads or ways (if any exists); (iv) include the legal
description and the gross amount of the total acreage of the Property; (v)
include a certification that the Property is not located in the one hundred
(100) year flood plain, and (vi) be sufficient to enable the Title Company to
delete its standard survey exception and issue a title insurance policy (the
"Title Policy") for the Property free from any exceptions relating to survey
matters, and if the Property consists of more than one tax parcel, to issue a
contiguity endorsement. Purchaser shall, promptly after receipt, provide Seller
with a copy of the Title Commitment and survey.

               (c)  Title Defects. If (1) the Title Commitment shows that Seller
does not have recordable, marketable, and indefeasible title to the Property in
fee simple subject only to the Permitted Exceptions; or if (2) the Title
Commitment or the Survey shows that the Property is subject to any title
defects, liens, encumbrances, easements, rights-of-way, covenants, reservations
or restrictions other than Permitted Exceptions and mortgages or other monetary
liens which Seller agrees Seller will cause to be discharged or canceled at the
time of Closing; or if (3) the Survey discloses conditions which are not in
conformity with the criteria set forth in the preceding paragraph; or if (4)
Purchaser determines that any utility easements or other matters will have an
adverse affect upon the ability to fully use the Property for the Project (all
of the foregoing being collectively called "Title Defects"), then Purchaser
shall give Seller written notice thereof on or prior to May 1, 2003. If, as of
May 15, 2003, Seller notifies Purchaser in writing that Seller is unwilling or
unable to remove any Title Defect, then Purchaser may, at its option, (i) agree
to waive

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such defects and proceed to close the purchase of the Property as-is; or (ii)
terminate this Agreement. If Seller fails to respond to the Title Defect in
writing, then Seller shall be deemed to have notified Purchaser that it is
unwilling or unable to cure the Title Defect and Purchaser shall have the same
options described in the immediately preceding sentence. Purchaser shall elect
option (i) or (ii) above by written notice to Seller on or before May 30, 2003.
If Purchaser fails to elect either option as provided herein, Purchaser shall be
deemed to have elected option (i). If Purchaser terminates this Agreement
pursuant to provisions of this sub-paragraph, both parties shall be released
from all further obligations hereunder.

          5.   Closing; Possession. The parties hereto agree to close this
purchase and sale (hereinafter, the "Closing") on or before September 30, 2003
in the offices of Purchaser or Purchaser's counsel. Purchaser shall have the
right to move the Closing to an earlier date with the written agreement of
Seller. Seller shall at Closing execute and deliver such other documents or
instruments as may be reasonably required by Purchaser, or required by other
provisions of this Agreement, or reasonably necessary to effectuate the Closing,
including, without limitation, the deed as required by this Agreement, a
commercially reasonable title affidavit, such proof of authority as may
reasonably be requested, and a closing statement. Purchaser shall deliver the
Purchase Price due at Closing pursuant to the terms of this Agreement and
execute and deliver such other documents or instruments as may reasonably be
required by Seller to effectuate the Closing, including, without limitation, a
closing statement.

                    *

                    *

                    *

          Seller shall, prior to the date occupancy is to be delivered to
Purchaser, remove all property that Seller desires to remove and any items
remaining after such date may be disposed by Purchaser in any manner it desires.

                    *

* CONFIDENTIAL INFORMATION HAS BEEN OMITTED PURSUANT TO A REQUEST FOR
CONFIDENTIAL TREATMENT AND HAS BEEN FILED SEPARATELY WITH THE SECURITIES AND
EXCHANGE COMMISSION.

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          6.   Purchaser's Conditions.

               (a)  Purchaser's Conditions. The obligation of Purchaser to
perform is subject to satisfaction of each of the following conditions on or
prior to Closing, which may be waived solely by Purchaser. Purchaser may
terminate this Agreement by written notice to Seller, if any of these conditions
are not satisfied to Purchaser's sole satisfaction. If the Agreement is
terminated as provided above prior to May 31, 2003 then neither party shall have
any further rights or obligations hereunder. If Purchaser terminates this
Agreement after May 31, 2003 due to failure to satisfy any of its contingencies
hereunder, then Seller shall be entitled to retain the Deposits paid (unless
Seller is in default under this Agreement) and neither party shall have any
further rights or obligations hereunder.

                    (i)  Performance by Seller. Seller shall have not breached
any warranty contained in this Agreement nor shall Seller have failed to perform
any obligation required by this Agreement to be performed by Seller.

                    (ii) Approval of Inspections. Purchaser shall have
determined in its sole discretion, from any inspections and investigations made
pursuant to Section 4, including environmental audits, building inspections,
market studies, soil tests, traffic studies and any other studies and
investigations related to the Property or the Project that Purchaser may elect
to conduct or have conducted, that the Property and the conditions and
circumstances surrounding the Property are suitable for the Purchaser's intended
use of the Property for the Project and for future redevelopment of the same.

                    (iii) Title Policy. The Title Company shall have irrevocably
committed itself in writing to deliver to Purchaser an owner's title policy in
the full amount of the Purchase Price, insuring in Purchaser good record
marketable title to the Property, with all standard and general exceptions
deleted or endorsed over so as to afford full "extended form coverage" and
showing as exceptions only the Permitted Exceptions, subject only to the
requirement that Seller execute and deliver the documents required hereunder,
and any Title Defects described in Section 4 shall have been removed.

                    (iv) Environmental Audit. Purchaser shall have determined
from existing environmental audits, such new environmental audits as Purchaser
may have performed at Purchaser's expense and Purchaser's counsel and
environmental consultants review of the same that the Property is not
contaminated by any hazardous or toxic wastes or dangerous materials in
violation of any law, including without limitation, petroleum products, asbestos
materials, bio-hazard materials or any other materials, the disposal,
transportation, use, storage or generation of which is governed or regulated by
any laws, statutes, codes or regulations which are intended to protect the
environment or public health, and that there are no underground storage tanks
located on the Property (collectively, "Hazardous Materials") and that there are
no Hazardous Materials on, under or around the Property at levels or
concentrations which are likely to cause Purchaser, as owner of the Property to
be required to perform any governmental ordered or supervised clean-up, either
as a result of demolition of existing improvements, construction of the Project
or otherwise, or to incur risks of liability which are unacceptable to
Purchaser, in its sole discretion.

                                        4

<PAGE>

               (b)  Seller's Conditions. The obligations of Seller to perform
under this Agreement are subject to satisfaction of each of the following
conditions on or before the date mentioned in each condition. If these
conditions are not satisfied on or before the applicable date, then Seller may
terminate this Agreement by written notice to Purchaser, whereupon neither party
shall have any further obligations hereunder. If Seller fails to terminate this
Agreement by written notice to Purchaser on or before the applicable date
mentioned in each contingency, then the contingency contained therein shall be
deemed to be satisfied or waived by Seller as of the date so mentioned.

                    (i)  Performance by Purchaser. Purchaser shall not have
breached any warranty contained in this Agreement nor shall Purchaser have
failed to perform any obligations required by this Agreement to be performed by
Purchaser. Seller's right to terminate this Agreement pursuant to this Section
6(b) shall expire on the date of Closing.

                    (ii) Seller Approvals. On or before February 13, 2003,
Seller shall have obtained the required approvals from Seller's board of
directors and lenders as to the sale of the Property.

                    (iii) *

                    (iv) *

          7.   Failure to Close. Both Purchaser and Seller shall have the right
to terminate this Agreement if any of the conditions described in Section 6 are
not satisfied or waived on or before the dates referenced therein by written
notice of such termination to the other party, whereupon neither party shall
have any further obligations to the other under this Agreement. Seller shall
have the right to terminate this Agreement only upon the failure of an express
contingency set forth in Paragraph 6(b) above.          *

If Purchaser or Seller do not terminate this Agreement prior to May 31, 2003
pursuant to an express right to do so as contained herein, and if Seller does
not default in any of its obligations hereunder and none of the Seller's
representations and warranties prove to be untrue, but Purchaser fails to close
as required by this Agreement, then Seller's sole and exclusive right and remedy
shall be to retain the Deposits paid by Purchaser as liquidated damages, the
parties acknowledging and agreeing that Seller's actual damages could be
difficult if not impossible to ascertain.

* CONFIDENTIAL INFORMATION HAS BEEN OMITTED PURSUANT TO A REQUEST FOR
CONFIDENTIAL TREATMENT AND HAS BEEN FILED SEPARATELY WITH THE SECURITIES AND
EXCHANGE COMMISSION.

                                        5

<PAGE>

          8.   Real Estate Taxes and Other Prorations. Real estate taxes and
current installments of assessments for the year in which the Closing occurs
shall be prorated as of the date of Closing, based upon the most recently issued
tax bills, with Purchaser receiving a credit at Closing for the real estate
taxes charged for the time period prior to Closing. If the Property is subject
to any assessments, then such assessments shall be likewise prorated at Closing.

          9.   Eminent Domain or Casualty. If all or a material portion of the
Property (meaning more than 15% of the acreage of the Property) is taken or is
made subject to eminent domain or other governmental acquisition proceedings
prior to Closing, then Seller shall promptly notify Purchaser thereof, and
Purchaser may either complete the Closing and receive the proceeds paid or
payable on account of such acquisition proceedings, including any right to
receive the same or terminate this Agreement, in which event Seller shall retain
all portions of the Deposits then made. If any of the buildings or improvements
are damaged or destroyed prior to Closing by fire or any other casualty, then
Purchaser shall proceed to Closing but Seller shall receive the insurance
proceeds paid or payable on account of such damage or destruction, including any
rights to receive the same.

          10.  Agreements, Representations and Warranties of Seller. Seller
represents, warrants, and covenants to Purchaser as to the following matters,
and shall be deemed to remake all of the following representations, warranties,
and covenants as of the date of Closing. The truth and accuracy of all of the
following representations, warranties, and covenants shall be conditions
precedent to Purchaser's obligation to close under this Agreement.

               (a)  Validity of Agreement. To Seller's actual knowledge, the
entering into of this Agreement and the consummation of the sale of the Property
will not require Seller to obtain (either before or after the Closing) any
consent, license, permit, wavier, approval, authorization or any other action
of, by, or with respect to any non-governmental or governmental person or
entity, except Seller's lenders and Seller's board of directors as described in
Section 6(b).

               (b)  Violation of Law. To Seller's actual knowledge, there is no
condition existing with respect to the maintenance, operation, use, or occupancy
of the Property which violates any statute, ordinance, law, or code, nor has
Seller received any notice, written or otherwise, from any governmental agency
alleging violations of any law, statute, ordinance, or regulation relating to
the Property.

               (c)  Legal Proceedings. To Seller's actual knowledge, there is
not pending or, to the best of Seller's knowledge, threatened, litigation,
eminent domain proceeding, arbitration, administrative action or examination,
claim or demand whatsoever relating to the Property.

                                        6

<PAGE>

               (d)  Access. To Seller's actual knowledge, no fact or condition
exists which would result in the termination or impairment of access to the
Property from adjoining public or private streets or ways or which could result
in discontinuation of necessary sewer, water, electric, gas, telephone, or other
utilities or services, except for *

               (e)  Transfer of Property. Prior to Closing, Seller shall not
lease, encumber, or transfer all or any part of the Property without Purchaser's
consent. Seller warrants that, except for this Agreement, there are no purchase
contracts, options, leases or any other agreements of any kind, oral or written,
formal or informal, whereby any person or entity other than Seller will have
acquired or will have any basis to assert any right, title, or interest in, or
right to possession, use, enjoyment or proceeds of any part or all of the
Property except for as may be of record in the Hamilton County Recorder. At or
prior to Closing, Seller shall cause all mortgages and other monetary liens
(except for real estate taxes and assessments not yet due and payable) to be
discharged and released.

               (f)  Hazardous Materials. Prior to the execution of this
Agreement, Seller has provided true, accurate and complete copies of a Phase I
and Phase II environmental study of the Property (the "Environmental Reports").
Except as disclosed in the Environmental Reports, to Seller's actual knowledge,
no Hazardous Materials exist on the Property.

               (g)  Cooperation. Seller shall reasonably cooperate with
Purchaser, at no cost to Seller, as may be necessary in order to satisfy
Purchaser's conditions in Section 6 of this Agreement, including signing such
applications, consents and other documents and instruments as Purchaser may
reasonably request for zoning, permitting or other purposes, in its efforts to
satisfy conditions and by making available to Purchaser all information which is
related to the Property available to Purchaser.

               (h)  Service Agreements. All management and service agreements,
if any, affecting the Property will be terminated as of the date of          *
          so that there shall be no obligations under any management or service
agreements affecting the Property after such date.

          As used herein, the term "actual knowledge" shall be deemed to mean
the actual knowledge of Seller's senior officers.

          11.  The Agreements, Representations and Warranties of Purchaser.
Purchaser represents, warrants and covenants to Seller as to the following
matters, and shall be deemed to remake all of the following representations,
warranties and covenants as of the date of Closing. The truth and accuracy of
all the foregoing representations, warranties and covenants shall be conditions
precedent to Seller's obligation to close under this Agreement.

* CONFIDENTIAL INFORMATION HAS BEEN OMITTED PURSUANT TO A REQUEST FOR
CONFIDENTIAL TREATMENT AND HAS BEEN FILED SEPARATELY WITH THE SECURITIES AND
EXCHANGE COMMISSION.

                                        7

<PAGE>

               (a)  Validity of Agreement. To Purchaser's actual knowledge
(being defined as the actual knowledge of Purchaser's senior officers), entering
into this Agreement and the consummation of the purchase of the Property will
not require Purchaser to obtain (either before or after the Closing) any
consent, license, permit, waiver, approval, authorization or any other action
of, by or with respect to any non-governmental or governmental person or entity.
Purchaser is authorized, and the person signing on behalf of Purchaser is
authorized, to execute and deliver this Agreement and all documents contemplated
hereby, and both the Purchaser and the person signing on behalf of Purchaser
have the full right, power and authority to consummate the transaction
contemplated by this Agreement.

          12.  Notices. All notices required or permitted by this Agreement
shall be in writing, and shall be deemed properly delivered when and if hand
delivered, sent by Federal Express or other nationally recognized overnight
courier service or deposited in the United States mail, postage prepaid,
certified or registered mail, return receipt requested, addressed to the parties
hereto at their respective addresses set forth below or as they may hereafter
specify by written notice delivered in accordance herewith:

                       Purchaser:       Cincinnati Galleria, LLC
                                        c/o Vision Land Development, LLC
                                        455 Delta Avenue, Suite 108
                                        Cincinnati, Ohio 45226
                                        Attn: Mr. Kent Arnold

                       With a copy to:  Richard D. Herndon
                                        Griffin-Fletcher, LLP
                                        3500 Red Bank Road
                                        Cincinnati, Ohio 45227

                       Seller:          Ceco Environmental Corp.
                                        3120 Forrer Street
                                        Cincinnati, Ohio 45209-1016
                                        Attn: Marshall Morris, CFO

                       With a copy to:  George Vincent, Esq.
                                        Dinsmore & Shohl, LLP
                                        255 East Fifth Street
                                        1900 Chemed Center
                                        Cincinnati, Ohio 45202

          13.  Expenses. Seller shall pay for any transfer tax in connection
with the sale of the Property. Purchaser shall pay the survey costs, the title
insurance premium and recording charges. Each party shall pay for its own legal
and accounting fees and other expenses in connection with this Agreement and the
sale and transfer of the Property.

                                        8

<PAGE>

          14.  Brokers. Seller and Purchaser each hereby represent to the other
that it has not involved or worked with any brokers, agents or finders in the
negotiation of this Agreement or the consummation of this transaction and that
there are no such other brokers, agents or finders that have any right to claim
a commission or fee due to the consummation of this transaction, except for
Cincinnati Commercial Realtors and Vision Land Development, LLC. If the Closing
occurs, Seller shall pay at Closing a total 4% commission to such brokers (3% to
Cincinnati Commercial Realtors and 1% to Vision Land Development, LLC). Each
party hereby agrees to indemnify and hold harmless the other from and against
any and all liabilities, including costs and expenses such as attorneys' fees,
arising out of any claims by any brokers, agents or finders that they are
entitled to such a commission or fee as the result of the actions of the
indemnifying party.

          15.  Miscellaneous.

               (a)  Entire Agreement; Binding Effect. This Agreement and the
Exhibits attached hereto constitute the entire contract between the parties and
supersede all prior understandings, if any. Any subsequent conditions,
representations, warranties, or agreements shall not be valid and binding upon
the parties unless in writing and signed by both parties. This Agreement shall
be binding on and inure to the benefit of the parties and their respective
heirs, successors and assigns. Without limiting Purchaser's right to assign this
Agreement to any other party, Seller specifically acknowledges that Purchaser
may assign this Agreement to any related or affiliated entity or to an
intermediary in connection with a like kind exchange under Section 1031 of the
Internal Revenue Code and Seller consents to such assignment and agrees to
cooperate with Purchaser in completing such assignment, provided however, that
Purchaser hereby indemnifies Seller from all costs or expenses incurred by
Seller solely on account of this transaction being structured as a like-kind
exchange. Purchaser specifically acknowledges that Seller may assign this
Agreement to any related affiliated entity or to any intermediary in connection
with a like-kind exchange under Section 1031 of the Internal Revenue Code and
Purchaser consents to such assignment and agrees to cooperate with Seller in
completing such assignment and like-kind exchange provided, however, that Seller
shall indemnify Purchaser from all costs or expenses incurred by Purchaser
solely on account of this transaction being structured as a like-kind exchange.

               (b)  Original Document. This Agreement may be executed by both
parties in counterparts, each of which shall be deemed an original, but all of
such counterparts taken together shall constitute one and the same Agreement.

          15.  New State Taxes. If, prior to Closing, new Ohio state sales or
services types of taxes are imposed such that the real estate commissions paid
under this Agreement are taxed thereby, then Purchaser shall pay such taxes at
Closing.

          16.  *

* CONFIDENTIAL INFORMATION HAS BEEN OMITTED PURSUANT TO A REQUEST FOR
CONFIDENTIAL TREATMENT AND HAS BEEN FILED SEPARATELY WITH THE SECURITIES AND
EXCHANGE COMMISSION.

                                        9

<PAGE>

          EXECUTED as of the day and year first above written.

Witnesses:                              PURCHASER:
                                        CINCINNATI GALLERIA, LLC,
                                        an Ohio limited liability company

 /s/ L. John Bertoli III                By   /s/  Kent M. Arnold
------------------------                     -------------------
Print Name: L. John Bertoli III         Print Name: Kent M. Arnold
                                        Its: President

 /s/ Beverly L. Purkhiser
-------------------------
Print Name: Beverly L. Purkhiser

                                        SELLER:
                                        THE KIRK & BLUM MANUFACTURING
                                        COMPANY,
                                        an Ohio corporation

 /s/  L. John Bertoli III               By:  /s/  Marshall J. Morris
-------------------------                    ------------------------
Print Name: L. John Bertoli III         Print Name: Marshall J. Morris
                                        Its: CFO

 /s/  Beverly L. Purkhiser
--------------------------
Print Name: Beverly L. Purkhiser

                                       10

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