Document:

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                                                                   EXHIBIT 10.35

                                    AGREEMENT

         This Separation Agreement and General Release (the "Agreement") is made
and entered into by and between Steven I. Taub ("Employee") and CECO Filters,
Inc., a Delaware corporation (sometimes referred to as the "Company") and CECO
Environmental Corp., a New York corporation ("CECO").

1. Separation Date. Employee's employment with the Company ends June 30, 2000
(the "Separation Date"). As of the Separation Date (i) Employee shall resign as
President and Chief Executive Officer and as a director of the Company, (ii) the
Employment Agreement between Employee, Company and CECO dated September 30,
1997, as amended, and all other benefits and financial arrangements between
Company and Employee shall automatically terminate except as specifically set
forth herein, (iii) all options issued to Employee pursuant to the Incentive
Stock Option Agreement between CECO and Employee dated October 1, 1997 ("Stock
Option Agreement") shall immediately terminate, notwithstanding Paragraph 2.b of
the Stock Option Agreement.

2. Services. Employee shall cooperate in achieving an orderly transition of
responsibility and information within the Company. In addition, following the
Separation Date and through and including October 28, 2000 (the "Extension
Date"), Employee shall make himself reasonable available to assist the Company
in its business operations. Company shall give Employee reasonable notice of
where and when Employee's services are required and Employee shall use his
reasonable efforts to accommodate such requirements. Employee shall be
reimbursed for such reasonable and authorized expenditures which he may incur in
the performance of services provided hereunder. Such authorized expenditures
will be reimbursed upon presentation by Employee to the Company of receipts
relating thereto in the form usually required by the Company according to its
regular policy and in conformity with applicable rules and regulations of the
Internal Revenue Service.

3. Payment of Earned Wages and Vacation Pay. Not later than the next regularly
scheduled payday on or after the Separation Date, the Company will pay Employee
all wages that he earned at the Company through the Separation Date, as well as
for all vacation days that he had accrued but not used as of that date, in
accordance with the following Schedule:

                         $4,451.92 payable July 13, 2000
                         $2,225.96 payable July 13, 2000
                         $4,788.40 payable July 13, 2000
                         $9,577.00 payable July 27, 2000
                         $9,577.00 payable Aug 10, 2000
                         $9,577.00 payable Aug 24, 2000
                         $9,577.00 payable Sept 7, 2000
                         $9,577.00 payable Sept 21, 2000
                         $9,577.00 payable Oct 5, 2000
                         $9,577.00 payable Oct 19, 2000
                         $9,577.00 payable Nov 2, 2000
<PAGE>

4. Consideration from the Company to Employee.

   In consideration for the releases and covenants by Employee set forth in this
Agreement, CECO agrees that, provided that Employee fully complies with all of
his covenants and obligations under this Agreement (including without limitation
those which survive the end of his employment):

         (a) CECO shall purchase from Employee all of his CECO stock,
   aggregating 441,297 shares, at the purchase price of $2.125 per share,
   pursuant to a Stock Purchase Agreement in substantially the form attached
   hereto as Exhibit A;

         (b) CECO shall purchase from Hilary Taub CECO stock owned by her that
   was previously transferred from Employee to Hilary Taub, aggregating 124,703
   shares at the purchase price of $2.125 per share, pursuant to a Stock
   Purchase Agreement in substantially the form attached hereto as Exhibit B;
   and

         (c) Company shall pay Taub $678.37 per day through the Extension Date
   for a total of $81,404.40 (the "Additional Payment"). The Additional Payment
   shall not include amounts paid for Employee's major medical insurance costs
   which shall be paid by Employer until the Extension Date. Payments of the
   Additional Payment shall be made on Company's regularly scheduled paydays.

         The Company, at its option, may terminate this Agreement in the event
that Hilary Taub does not enter into and perform the terms of a Stock Purchase
Agreement pursuant to (b) above.

5. Benefits. Employee's coverage under all of the Company's benefit programs and
plans other than the major medical insurance plan will end as of the Separation
Date. Employee's coverage under the Company's major medical insurance plan will
end as of the Extension Date, and will be paid for by Employer until such date.
Employee shall be eligible, at his sole cost and expense, to elect health care
continuation coverage as of the Extension Date to the extent required by the
Federal Consolidated Omnibus Budget Reconciliation Act of 1985 ("COBRA") or
Pennsylvania law, as the case may be. Employee shall be entitled to a
certificate of creditable coverage to the extent required by the Federal Health
Insurance Portability and Accountability Act. The Company will cooperate with
the transfer of Employee's existing 401(k) plan funds from the Company's 401(k)
plan as directed by Employee.

6. Released Parties. "Released Parties," as used in this Agreement, shall mean:

   (a) with respect to Employee, (1) the Company and any entity or person that
controls, is controlled by or is under common control with, including without
limitation, CECO and CECO Group, Inc.; and (2) all past and present partners,
members, officers, directors, shareholders, agents, employees, officials,
employee benefit plans (and their sponsors, fiduciaries (to the extent permitted
by the Employee Retirement Income Security Act of 1974) and administrators),
insurers, and attorneys of any entity or person described in part (1) of this
Paragraph 6(a); and
<PAGE>

   (b) with respect to the Company, Employee.

7. Release. In consideration for the respective promises described herein and
for the stock purchases and other consideration described in paragraph 3 above,
which Employee acknowledges are in excess of any earned salary, wages or
benefits due and owing to Employee, Employee, on behalf of himself and his
agents, representatives, attorneys, assigns, heirs, executors, and
administrators, and Company, on behalf of itself, its agents, representatives,
attorneys, successors and assigns, fully releases each of the Released Parties
indicated with respect to such releasing party in Paragraph 6 hereof, from any
and all liability, claims, demands, actions, causes of action, suits,
grievances, debts, sums of money, agreements, promises, damages, back and front
pay, costs, expenses, attorneys fees, and remedies of any type, known or
unknown, liquidated or unliquidated, absolute or contingent, at law or in
equity, which were or could have been filed with any Federal, state, or local
court, agency, arbitrator or any other entity, regarding any act or failure to
act that occurred up to and including the date on which Employee signs this
Agreement, including but not limited to relating to Employee's employment with
and separation of employment from the Company and including but not limited to
all claims, actions or liability under: (1) Title VII of the Civil Rights Act of
1964, the Civil Rights Act of 1991, the Civil Rights Act of 1866 (42 U.S.C.
ss.1981), the Age Discrimination in Employment Act, the Americans With
Disabilities Act, the Fair Labor Standards Act, the Equal Pay Act, the National
Labor Relations Act, the Employee Retirement Income Security Act and the Family
and Medical Leave Act, (2) any other federal, state or local statute, ordinance,
regulation, or constitutional provision regarding employment, payment of wages,
compensation, employee benefits, termination of employment, or discrimination in
employment; and (3) the common law of the United States, Pennsylvania or any
other state relating to contracts, wrongful discharge, fraud, defamation, or any
other matter. This Agreement shall not waive or release any rights or claims
that Employee or the Company may have against the other which arise after the
date that Employee signs this Agreement. Employee does herein waive his right to
re-employment, reinstatement and Employee does herein agree not to reapply for
employment with the Company or CECO or any affiliate therof.

8. Covenant Not To Sue. Except for an action arising out of a breach of this
Agreement, each of CECO and Employer on the one hand, and Employee on the other
hand agrees, on behalf of itself/himself and its/his agents, representatives,
attorneys, successors, assigns, heirs, executors, and administrators, never to
bring (or cause to be brought) any claim, action or proceeding against any of
the Released Parties regarding any act or failure to act that occurred up to and
including the date on which CECO or Employer/Employee signs this Agreement,
including but not limited to any claim, action or proceeding relating to
Employee's employment with or separation of employment from the Company. If any
such claim, action or proceeding has been brought before such party signs this
Agreement, the tender of this Agreement shall be sufficient to obtain a
dismissal of such claim, action or proceeding and the complaining party shall
pay for all attorney fees and costs incurred by the other party to enforce this
covenant. The complaining party must and will take all steps necessary to cause
it to be withdrawn and dismissed with prejudice. If any such claim, action or
proceeding is brought after Employee signs this Agreement, Employee will
immediately become ineligible for any further consideration from the Company
under this Agreement and must and will return to the Company all consideration
already received from the Company under this Agreement, except that the purchase
<PAGE>

of stock by CECO from Employee and Hilary Taub shall not be reversed or
otherwise affected by the bringing of such claim, action or proceeding.

9. Non-admission. This Agreement does not constitute an admission by any of the
Released Parties, and the Company specifically denies, that any action that any
of the Released Parties has taken or has failed to take with respect to Employee
was wrongful, unlawful, or susceptible of inflicting any damages or injury on
Employee.

10. Confidentiality of Agreement. Except as may be specifically required by law,
Employee will not (without the prior written consent of the Chairman of CECO)
disclose, publish, indicate, or in any manner communicate any of the terms of
this Agreement to any other person or entity except his attorney(s) or
accountant(s). Prior to any such authorized disclosure, Employee will inform
each such person to whom disclosure is to be made that the terms of this
Agreement are confidential and secure the agreement of each such person to
maintain the confidentiality of all terms of this Agreement. If Employee is
specifically required by law to disclose any of the terms or provisions of this
Agreement, Employee will, before making any such disclosure, provide prompt
written notice to the Chairman of CECO in which Employee shall describe the
reason for, and the scope, nature, and timing of, any such legally required
disclosure.

11. Confidential Information. Employee acknowledges and agrees that during the
course of his employment he has been in continuous contact with customers,
suppliers and others doing business with the Company throughout the world.
Employee further acknowledges that the performance of his duties has exposed him
to data and information of a confidential nature concerning the business and
affairs of the Company and its customers and suppliers, including but not
limited to information relative to strategic plans, business model, sales
methods, new programs, profitability analysis and related information, customers
and customer buying patterns, suppliers and sources of supply, and the entirety
of the systems, methods, processes and procedures and operations utilized in the
provision of goods and services to customers. All such data (collectively the
"Confidential Information") is vital, sensitive, confidential, and proprietary
to the Company and/or its customers and suppliers.

   Employee expressly agrees that as an employee of the Company he has been
under a duty of confidentiality, and that this duty extends indefinitely beyond
his employment. Employee expressly agrees that he will not, directly or
indirectly, whether as a director, shareholder, owner, partner, member, employee
or agent of any business, or in any other capacity, make known, disclose,
furnish, make available, or utilize any of the Confidential Information.
Employee's obligation under this paragraph with respect to particular
Confidential Information shall terminate at such time (if any) as the
Confidential Information in question becomes generally known to the public other
than through a breach of Employee's obligations hereunder. The obligations or
confidentiality hereunder shall not relate to information which:

         (a) presently is in the public domain;

         (b) hereafter becomes part of the public domain by publication or
otherwise through no action of Employee or any person or entity subject to
confidentiality requirements similar to those contained in this agreement; or
<PAGE>

         (c) hereafter is obtained by Employee from a source other than a
Released Party, which was not under an obligation of confidentiality to a
Released Party.

12. Non-Solicitation.

    (a) Employee agrees that, for one year following the Extension Date, he will
not approach or attempt to entice away or in any other manner solicit, persuade
or attempt to persuade: (i) any employee of the Company to discontinue such
employee's employment with the Company, or (ii) any client, customer, affiliate,
sponsor or strategic partner of the Company to discontinue or otherwise reduce
or modify the amount or manner of business with the Company

    (b) Employee acknowledges that the Confidential Information is proprietary
property of the Company, as are the relationships of the Company with its
clients, customers, affiliates, sponsors and strategic partners, from which the
Company derives a competitive advantage and economic value, and the
confidentiality of which must be maintained; and that any disclosure of
Confidential Information or breach of the non-solicitation provisions of
Paragraph 12(a) or breach of the provisions of Paragraph 13 would cause
irreparable harm to the Company and that monetary damages alone would not be
sufficient to cure any such resultant harm. Employee further acknowledges that
the restrictions contained in Paragraphs 11, 13 and this Paragraph 12 are
reasonable in light of the interest of the Company in protecting its businesses,
and that such restrictions will not prevent him from earning a livelihood in
Employee's chosen career and business. Therefore, in the event of any actual or
threatened breach by Employee of any of the provisions of Paragraph 11,
Paragraph 12, or Paragraph 13 of this Agreement, the Company will be entitled to
injunctive relief without posting a bond, in addition to such other rights and
remedies which may be available to the Company at law or in equity.

13. Non-Compete; Right of First Refusal. Employee agrees that for a period
commencing on the Separation Date and continuing for one year from the Extension
date, Employee will not, within the continental Unites States, directly or
indirectly engage in the business of the manufacture and sale of fiber bed
filter and bag house medium pollution control systems or in any other business
competitive with the Company. Directly or indirectly engaging in the business of
the manufacture and sale of fiber bed filter and bag house medium pollution
control systems or in any competitive business shall include engaging in
business as owner, partner or agent, or as employee of any person, firm or
corporation engaged in such business, or being interested directly or indirectly
in any such business conducted by any person, firm, corporation, or other entity
or association. Employee's ownership of less than five percent (5%) of the
outstanding voting securities of any publicly traded company shall not violate
the foregoing prohibition.

   Notwithstanding the foregoing, Employee, commencing after the Extension Date,
may engage in consulting activities involving environmental matters, including
air quality improvement matters; provided, that in the event that Employee is
presented with or finds an opportunity for CECO or its affiliates at any time
within one (1) year from the Extension Date, Employee shall first present such
opportunity to CECO. In the event that CECO declines an opportunity after
<PAGE>

Employee notifies CECO in writing of such opportunity, Employee may offer such
opportunity to another company that may be engaged in a similar business to CECO
or the Company. If CECO does not notify Employee that CECO or one of its
affiliates is interested in pursuing such opportunity within 10 days of
receiving written notice of an opportunity, CECO shall be deemed to have
declined such opportunity; provided, that if the circumstances or terms of such
opportunity change, Employee shall again be required to first offer such
opportunity to CECO prior to any other party. An opportunity for CECO shall
include the identification of (i) potential customers for CECO or its
affiliates, (ii) available equipment or services for acquisition by CECO or its
affiliates, (iii) strategic alliance opportunities for CECO or its affiliates,
and (iv) such other opportunities that may benefit CECO or its affiliates. With
respect to opportunities brought to CECO by Employee that CECO pursues and
closes, CECO shall treat Employee as a finder and shall compensate him as agreed
to among the parties based upon similar customary transactions. "Affiliates" for
purposes of this Agreement means with respect to any party, any entity or person
that, directly or indirectly, controls, is controlled by or is under common
control with such party. For purposes of this Section 13, the term "opportunity"
shall mean a corporate opportunity that is or represents a transaction, business
arrangement, acquisition, deal, purchase, sale, partnership, joint venture or
alliance opportunity, potential customer or vendor relationship or other
business activity of the type or nature in which CECO or any of its direct or
indirect subsidiaries are currently involved or otherwise engaged as of the date
of this Agreement.

14. Return of Company Materials and Property and Delivery of Current Activity
    Report Upon Termination.

    (a) No later than two business days after the Separation Date, Employee
shall return to the Company all the Company property, including but not limited
to equipment, keys, phone cards, passkeys, documents, memoranda, correspondence,
manuals, handbooks, and any and all other records or documents, including
information stored on computer disks or in computer readable form, with no right
of retention of any copy, except that Employee may retain such items as are
necessary for Employee to perform the services set forth in paragraph 2;
provided, all such items shall be returned to the Company no later than two
business days after the Extension Date. The Company may assert its authority and
rights under this Paragraph 14(a) by inspection.

    (b) No later than five (5) business days after the Separation Date, and in
accordance with Employee's duties as an employee of the Company through the
Separation Date, Employee shall deliver to the Company a complete activity
report of recent, current and pending contacts and relationships with all
clients, customers, affiliates, strategic partners, and potential clients,
customers, affiliates, and strategic partners, of the Company. Such activity
report shall be in writing and shall present, in an organized and easily
understood manner,

    (i)  the names and address of all such parties,

    (ii) the name, telephone number, facsimile number and e-mail address (as may
         apply) of each person with whom Employee has had any substantive
         contact for each such party,
<PAGE>

        (iii) the last date of any personal meeting and the last date of any
              conversation without a personal meeting with each such contact
              person,

        (iv)  the substance of the last such meeting and last such conversation,
              as well as a summary of all prior personal meetings and
              conversations with such contact person in which substantive
              business discussions occurred,

        (v)   the status of all such discussions, and

        (vi)  all other information known to Employee upon which the Company
              reasonably would conclude that it may have any obligation
              whatsoever to any such parties as a result of the business
              activity of Employee, or any other employee of the Company

15. No Encouragement of Claims, No Disparagement.

    (a) Employee will not encourage any person to file a lawsuit, charge, claim,
or complaint against any of the Released Parties. Employee will not assist any
person who has filed a lawsuit, charge, claim, or complaint against any of the
Released Parties unless and only to the extent that he is required to render
such assistance pursuant to a lawful subpoena or other legal obligation. If
Employee is served with any such legal subpoena or becomes subject to any such
legal obligation, he will provide prompt written notice to the chief executive
officer of the Company, in which he shall enclose a copy of the subpoena and any
other documents describing the legal obligation.

    (b) Neither Employee nor the Company shall at any time, including without
limitation any time following the last payment by the Company to Employee under
this Agreement, make any negative or disparaging statements about Employee's
employment with the Company, the termination of that employment or any other
dealings of any kind between Employee and the Company and/or CECO, to any third
party, including without limitation, any past, present or prospective employee
of the Company or any of its affiliates, or any client, customer, affiliate,
partner, sponsor or potential client, customer, affiliate, partner or sponsor of
the Company or its affiliates (including without limitation any person employed
by or otherwise associated with any education institution in the business and
educational community in which the Company or its affiliates conducts business);
provided, the Company shall not be liable for any unauthorized disparaging
statement by any employee of the Company provided that the Company exercises
reasonable due diligence to inform and direct all of its employees of the
existence and obligations of the Company under this non-disparagement covenant.

16. Entire Agreement. This Agreement contains the entire agreement and
understanding between Employee and the Company concerning the matters described
herein, and supersedes all prior agreements, discussions, negotiations,
understandings, and proposals of the parties. The terms of this Agreement cannot
be changed except in a subsequent document signed by Employee and an authorized
representative of the Company.
<PAGE>

17. Costs and Attorneys' Fees. If either party to this Agreement institutes a
legal action to enforce its rights under any provision of this Agreement, the
non-prevailing party in such action shall be liable to the prevailing party for
the costs and reasonable attorneys' fees incurred by the prevailing party in
connection with the action.

18. Severability. The provisions of this Agreement shall be severable and the
invalidity of any provision shall not affect the validity of the other
provisions; provided, however, that if Employee brings a lawsuit, claim, charge,
or complaint against any of the Released Parties, and a court of competent
jurisdiction finds that a release or waiver of claims or rights by Employee in
Paragraph 7 above, or a covenant by Employee in Paragraph 8 above, is illegal,
void or unenforceable, Employee agrees, at the Company's option, either to
execute promptly a release, waiver and/or covenant that is legal and enforceable
or to return promptly to the Company the full value of the consideration
provided to Employee under Paragraph 4 and Paragraph 5 above.

19. Applicable Law. This Agreement shall be construed and enforced in accordance
with, and all questions concerning the construction, validity, interpretation
and performance of this Agreement shall be governed by, the laws of the State of
Pennsylvania, without giving effect to that state's principles regarding
conflict of laws.

20. Knowing and Voluntary Waiver. Employee acknowledges that:

    (i) he has carefully read this Agreement and fully understands its meaning;

    (ii) he was advised in writing by the Company to consult with an attorney
before he signed this Agreement;

    (iii) he was not coerced into signing this Agreement;

    (iv) he agrees to all the terms of this Agreement and is entering into it
knowingly and voluntarily; and

    (v) the only consideration he is receiving for signing this Agreement is
described herein, and no other promises or representations of any kind have been
made by any person or entity to cause him to sign this Agreement.

21. Orderly Transition. It shall be of the essence of this Agreement that
Employee will assist in achieving an orderly transition of responsibilities to
his designated successor with respect to each responsibility.

22. Counterparts. This Agreement may be executed in counterparts and will be as
fully binding as if signed in one entire document.
<PAGE>

EMPLOYEE                                            CECO Filters, Inc.

/s/ Steven J. Taub                                  By: /s/ Phillip DeZwirek
------------------------------------                    ------------------------
Steven I. Taub                                      Its: /s/ Chairman
                                                         -----------------------

Date: /s/ 7/5/00                                    Date: /s/ July 5/00
     -------------------------------                      ----------------------

CECO Environmental Corp.

By: /s/ Phillip DeZwirek
    --------------------------------
Its: /s/ Chairman & CEO
     -------------------------------

Date: /s/ July 5/00
     -------------------------------<PAGE>

                                                                   EXHIBIT 10.36

                              STOCK SALE AGREEMENT
                              --------------------

         This agreement  (the  "Agreement")  is made as of the /s/ 5th day of
/s/ July,  2000 by and between Steven I. Taub (the "Seller"), and CECO
Environmental Corp. (the "Purchaser").

                                    RECITALS:

         A. The Seller desires to sell 441,297 shares of the common stock of the
Purchaser (the "Shares") for $2.125 per share.

         C. Purchaser desires to purchase the Shares.

                                   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 Shares for aggregate purchase consideration of $937,756.13 (the "Purchase
Price").

         2. The Closing. The closing (the "Closing") shall occur on June 30,
2000. On the date of the Closing the Seller shall deliver to the Purchaser
certificates representing the Shares ("Certificates") endorsed in blank or
accompanied by assignments separate from certificate sufficient to transfer the
Shares into the name of Purchaser and Purchaser shall deliver to the Seller the
Purchase Price by certified check or immediately available funds via wire
transfer.

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

            3.1 Authority Relative to this Agreement. 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 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.

            3.2 No Violation or Conflict. Neither the execution nor the
consummation of this Agreement will 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 of 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.

<PAGE>

            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 transaction 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. Seller has good and marketable title to the Shares
free and clear of all liens, charges, encumbrances, security interests and
claims whatsoever.

            3.7 Status of Seller. Seller is an executive officer of CECO
Filters, Inc. Seller has been given access to all the information that Seller
considers necessary or appropriate for deciding whether to sell the Shares.
Seller further represents that he has had an opportunity to ask questions and
receive answers from Purchaser regarding the business, properties, prospects and
financial condition of the Purchaser and its affiliates.

         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 and
validly existing under the laws of the State of New York 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.

            4.2 Authority Relative to the Contracts. The Purchaser has the
authority to enter into this Agreement. This Agreement has been duly executed
and delivered by the Purchaser and is a valid and binding Agreement 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 will violate any provision of the articles of
organization or operating agreement 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 of 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 termination of any agreement, instrument, lien, license, lease or
mortgage to which the Purchaser is a party.

<PAGE>

            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 transaction contemplated by this
Agreement.

            4.5 Absence of Litigation. There is no action, suit, proceeding,
claim, arbitration or investigation pending or, to the best knowledge of the
Purchaser, threatened or contemplated by any person including, without
limitation any governmental or regulatory agency, against the Purchaser or with
respect to the assets of the Purchaser 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 Purchaser which is known to present a
possibility for any such action, suit, proceeding, claim, arbitration or
investigation.

            5. Conditions Precedent to Obligations of the Purchaser.
Consummation of the transaction contemplated hereby on the part of the Purchaser
is subject to the fulfillment, to the reasonable satisfaction of the Purchaser,
of each of the following conditions:

            5.1 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.

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

            5.3 Separation Agreement. Seller has entered into and is not in
default of that certain Separation Agreement among Purchaser, Seller and CECO
Filters, Inc.

            5.4 Hilary Taub Agreement. Hilary Taub has entered into and
performed her obligations pursuant to a Stock Purchase Agreement among Hilary
Taub, CECO Filters, Inc. and Purchaser in form satisfactory to Purchaser.

         6. 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:

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

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

contemplated by this Agreement.

         7. Survival of Representations, Warranties, Covenants and Agreements.
All warranties, representations, covenants and agreements made hereunder shall
survive the Closing.

<PAGE>

         8. Termination. If any of the conditions for the consummation by the
Seller or the Purchaser of the closing of the transactions hereunder shall not
have been fulfilled (despite the best efforts of the party, if any, obligated to
fulfill such condition) or waived by July 15, 2000, then this Agreement may
thereafter be terminated by any party hereto. Such termination hereunder shall
be effected by notice by the terminating party to the other parties hereunder,
and upon such termination this Agreement shall be without further force and
effect, and no party hereto shall be liable to any other for any claim, damage,
cost or expense arising from the execution and delivery of this Agreement or the
failure to consummate the transactions contemplated hereby.

         9. Remedies. The parties hereto, in addition to being entitled to
exercise all rights provided herein or granted by law, including recovery of
damages, shall be entitled to specific performance of their rights under this
Agreement and all other appropriate equitable remedies. The parties agree that
monetary damages would not be adequate compensation for any loss incurred by
reason of a breach of the provisions of this Agreement, and hereby agree to
waive the defense, in any action for specific performance, that monetary damages
would be adequate compensation. The parties hereto further agree that in the
event of any breach of this Agreement, the breaching party shall be liable for
all damages arising as a consequence of such breach, including without
limitation, costs and expenses (including, without limitation, attorneys' fees),
incurred by the non-breaching party in attempting to enforce its rights
hereunder.

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

            10.1 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.

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

            10.3 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.

            10.4 Severability. The invalidity or unenforceability of any
particular provision of this Agreement shall not affect the other provisions
hereof, and this Agreement shall be construed in all respects as if the invalid
or unenforceable provision were omitted.

            10.5 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.

<PAGE>

            10.6 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 delivered to an internationally recognized courier service, or when
deposited with the U.S. Postal Service using certified mail, postage prepaid,
addressed to the recipient at:

         The Seller:

                  Steven I. Taub
                  ________________________

                  ________________________

         The Purchaser:

                  CECO Environmental Corp.
                  505 University Avenue
                  Suite 1400
                  Toronto, Ontario M5G 1X3
                  Canada
                  Attn:  Phillip DeZwirek

         with a copy to:

                  Leslie J. Weiss, Esq.
                  Sugar, Friedberg & Felsenthal
                  30 North LaSalle Street
                  Suite 2600
                  Chicago, Illinois 60602

or at such other address as a party may designate to another party in accordance
with the terms of this Section 10.6.

            10.7 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 Pennsylvania.

            10.8 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.

            10.9 Costs and Attorneys' Fees. If either party to this Agreement
institutes a legal action to enforce its rights under any provision of this
Agreement, the non-prevailing party in such action shall be liable to the
prevailing party for the costs and reasonable attorneys' fees incurred by the
prevailing party in connection with the action.

<PAGE>

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

                                            CECO Environmental Corp.

                                                  By: /s/ Phillip DeZwirek
                                                     ---------------------------
                                                  Its: /s/ Chairman
                                                      --------------------------
 .

                                                   /s/ Steven J. Taub
                                                  ------------------------------
                                                       Steven I. Taub

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