<PAGE>   1





                       SECURITIES AND EXCHANGE COMMISSION

                            WASHINGTON, D.C. 20549        

                                    FORM S-8

                             REGISTRATION STATEMENT

                                     under

                          THE SECURITIES ACT OF 1933      

                           CECO ENVIRONMENTAL CORP.                   
            (Exact name of registrant as specified in its character)

       New York                                                13-2566064
(State or other jurisdiction                                   (I.R.S. Employer
  of incorporation)                                            Identification
                                                               Number)

111 Elizabeth Street Suite 600, Toronto, Ontario CANADA              M5G 1P7
(Address of Principal Executive Officers)                          (Zip Code)

                    1995 Consulting Agreement Stock Options
                           (Full Title of the Plans)

                             Leslie J. Weiss, Esq.
                         Sugar, Friedberg & Felsenthal
                            30 North LaSalle Street
                                   Suite 2600
                            Chicago, Illinois  60602          
                    (Name and address of agent for service)

                                 (312) 704-9400                 
                    (Telephone number, including area code,
                             of agent for service)

Approximate date of commencement of proposed sale to the public:
As soon As Practicable After Registration Statement Becomes
Effective.

                               Page 1 of 12 Pages

                         Exhibit Index Begins on Page 8
                 (Facing Page Continued on the Following Page)
<PAGE>   2

                         (Continuation of Facing Page)

                        CALCULATION OF REGISTRATION FEE

<TABLE>
<CAPTION>
                                                                             
- ---------------------------------------------------------------------------------------------------------------------------- 
                                                          Proposed                 Proposed
 Title of                                                  Maximum                 Maximum
Securities                 Amount                         Offering                 Aggregate             Amount of
 to be                     to be                          Price Per                Offering             Registration
Registered              Registered                         Share                    Price                   Fee             
- ----------------------------------------------------------------------------------------------------------------------------
<S>                      <C>                             <C>                      <C>                   <C>
Common Shares,             1,000,000                        $2.25                     $2,250,000         (1) $776.25
par value $0.01
per share

- ---------------------------------------------------------------------------------------------------------------------------- 
Total                      1,000,000                        $2.25                     $2,250,000             $776.25         
- ---------------------------------------------------------------------------------------------------------------------------- 
</TABLE>                                                                     


(1) Estimated pursuant to Rule 457(h)(i) for the shares as to which options
    have been granted pursuant to the 1995 Consulting Agreement Stock Options.

    Pursuant to Rule 416(c) under the Securities Act of 1933, as amended, this
    Registration Statement also covers such additional indeterminate number of
    shares as may become issuable pursuant to anti-dilution and adjustment
    provisions of any options to purchase shares registered hereby.

<PAGE>   3

                                     PART I

                INFORMATION REQUIRED IN SECTION 10(A) PROSPECTUS

        The document(s) containing the information specified in part I of Form
S-8 will be sent or given to the applicable consultant as specified by Rule
428(b)(1) of the Securities Act of 1933, as amended (the "Securities Act"). Such
documents are not being filed with or included in this Form S-8 (by
incorporation by reference or otherwise) in accordance with the rules and
regulations of the Securities and Exchange Commission (the "SEC").  These
documents and the documents incorporated by reference into this Registration
Statement pursuant to Item 3 of Part II of this Registration Statement, taken
together, constitute a prospectus that meets the requirements of Section 10(a)
of the Securities Act.
<PAGE>   4

                                    PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

Item 3.  Incorporation of Documents by Reference.

         The following documents filed with the Commission (File No. 0-7099)
pursuant to the Securities Exchange Act of 1934 are incorporated by reference
into this Registration Statement.

    a.   The Company's Annual Report on Form 10-KSB for the fiscal year ended
December 31, 1994.

    b.   The Company's reports on From 10-QSB for the quarters ending March 31,
1995 and June 30, 1995.

    c.   The description of the Company's Common Stock, $0.01 par value, 
contained in the Company's registration statement on Form 10 filed pursuant to
Section 12(g) of the Securities Exchange Act of 1934 on April 27, 1973, which 
was declared effective on September 26, 1973, including any subsequent 
amendment or any report or other filing with the Securities and Exchange 
Commission updating such description.

    d.   All documents subsequently filed by the Registrant pursuant to Sections
13(a), 13(c), 14 and 15(d) of the Securities Exchange Act of 1934, prior to the
filing of a post-effective amendment which indicates that all the securities
offered have been sold or which registers all the securities then remaining
unsold, shall be deemed to be incorporated by reference in the Registration
Statement and to be part thereof from the date of filing of such documents.

Item 4.  Description of Securities.

         Not Applicable.

Item 5.  Interest of Named Experts and Counsel.

         Not Applicable.

Item 6.  Indemnification of Officers and Directors.

         The Company's By-laws provide that the Company shall indemnify any
person made, or threatened to be made, a party to an action or proceeding,
whether civil or criminal or investigative (a "proceeding"), including an action
by or in the right of the Company or any other corporation of any type or kind,
domestic or foreign, or any partnership, joint venture, trust, employee benefit
plan or other enterprise, which any director or officer of the Company served in
any capacity at the request of the Company, by reason of the fact that he, his
testator or intestate, was a director or officer of the Company, or served such
other corporation, partnership, joint venture, trust, employee benefit plan or
other enterprise in any capacity, against judgment, fines, amounts paid in
settlement and reasonable expenses, including attorney's





                                     II-1
<PAGE>   5

fees actually and necessarily incurred as a result of such proceeding, or any
appeal therein, if such director or officer acted, in good faith, for a purpose
which he reasonably believed to be in, or, in the case of service for any other
corporation or any partnership, joint venture, trust, employee benefit plan or
other enterprise, not opposed to, the best interests of the Company  and, in
criminal proceedings, in addition, had no reasonable cause to believe that his
conduct was unlawful.

        Any determination as to whether a person has met an applicable standard
of conduct shall be made in accordance with the provisions of the Business
Corporation Law of the State of New York.

        No indemnification shall be made to or on behalf of any person if a
judgment or other final adjudication adverse to such person establishes that his
acts were committed in bad faith or were the result of active and deliberate
dishonesty and were material to the cause of action so adjudicated, or that he
personally gained in fact a financial profit or other advantage to which he was
not legally entitled.

        The Company's indemnification provisions shall be enforced to the
fullest extent permitted under law.

Item 7.    Exemption from Registration Claimed.

           Not Applicable.

Item 8.    Exhibits.

           Exhibit
           Number                                    Description
           -------                                   -----------

           10(a)                           Consulting Agreement among the
                                           Company, Robert A. Lerman and
                                           John F. Ferraro, dated as of
                                           April 1, 1995.

           23                              Consent of Margolis & Company P.C.

Item 9.    Undertakings.

(1)        The undersigned Registrant hereby undertakes:

                (a)  to file, during any period in which offers or sales are
           being made, a post-effective amendment to this Registration Statement
           (i) to include any prospectus required by section 10(a)(3) of the
           Securities Act of 1933; (ii) to reflect in the prospectus any facts
           or events arising after the effective date of the Registration 
           Statement (or the most recent post-effective amendment thereof)





                                     II-2
<PAGE>   6
      which, individually or in the aggregate, represent a fundamental change
      in the information set forth in the Registration Statement; and (iii) to
      include any material information with respect to the plan of distribution
      not previously disclosed in the Registration Statement or any material
      change to such information in the Registration Statement; provided,
      however, that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply to
      information required to be included in a post-effective amendment by those
      paragraphs which are contained in periodic reports filed by the
      undersigned Registrant pursuant to Section 13 or 15(d) of the Securities
      Exchange Act of 1934 that are incorporated by reference in this
      Registration Statement;

          (b)  that, for the purpose of determining any liability under the
      Securities Act of 1933, each such post-effective amendment shall be deemed
      to be a new registration statement relating to the securities offered
      therein, and the offering of such securities at that time shall be deemed
      to be the initial bona fide offering thereof;

          (c)  to remove from registration by means of a post-effective 
      amendment any of the securities being registered which remain unsold at 
      the termination of the offering.

(2)      The undersigned Registrant hereby undertakes that, for purposes of
      determining any liability under the Securities Act of 1933, each filing
      of the Registrant's annual report pursuant to Section 13(a) or 15(d) of
      the Securities Exchange Act of 1934 that is incorporated by reference in
      the Registration Statement shall be deemed to be a new registration
      statement relating to the securities offered therein and the offering of
      such securities at that time shall be deemed to be the initial bona fide
      offering thereof.

(3)      Insofar as indemnification for liabilities arising under the Securities
      Act of 1933 may be permitted to directors, officers and controlling
      persons of the 1Registrant pursuant to the foregoing provisions, or
      otherwise, the Registrant has been advised that in the opinion of the
      Securities and Exchange Commission such indemnification is against public
      policy as expressed in the Act and is, therefore, unenforceable.  In the
      even that a claim for indemnification against such liabilities (other
      than the payment by the Registrant of expenses incurred or paid by a
      director, officer or controlling person of the Registrant in the
      successful defense of any action, suit or proceeding) is asserted by such
      director, officer or controlling person in connection with the securities
      being registered, the Registrant will, unless in the opinion of its
      counsel the matter has been settled by controlling precedent, submit to a
      court of appropriate jurisdiction the question whether such
      indemnification by it is against public policy as expressed in the act
      and will be governed by the final adjudication of such issue.





                                     II-3
<PAGE>   7

                                   SIGNATURES

        Pursuant to the requirements of the Securities Act of 1933, as amended,
the Registrant certifies that it has reasonable grounds to believe that it meets
all of the requirements for filing on Form S-8 and has duly caused this
Registration Statement to be singed on its behalf by the undersigned, thereunto
duly authorized, in the City of Toronto, Province of Ontario, on this 29th day
of August, 1995.

                                                    CECO ENVIRONMENTAL CORP.


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

        Pursuant to the requirements of the Securities Act of 1933, as amended,
this Registration Statement has been signed below by the following persons in
the capacities and on the dates indicated.

Date: August 29, 1995                                   /s/ Phillip DeZwirek  
                                                        ------------------------
                                                        Phillip DeZwirek
                                                        Chief Executive Officer,
                                                        Chief Financial Officer,
                                                        Director



Date: August 29, 1995                                   /s/ Jason Louis DeZwirek
                                                        ------------------------
                                                        Jason Louis DeZwirek
                                                        Director



Date: August 29, 1995                                   /s/ Josephine Grivas  
                                                        ------------------------
                                                        Josephine Grivas
                                                        Director





                                     II-4
<PAGE>   8

                                 EXHIBIT INDEX


<TABLE>
<CAPTION>

 Exhibit                                                     Page
 Number                    Document                          Number
 -------                   --------                          ------
 <S>                 <C>                                    <C>
 10(a)                  Consulting Agreement among the        9
                        Company, Robert A. Lerman and
                        John F. Ferraro, dated as of
                        April 1, 1995


 25                     Consent of Margolis & Company P.C.    12
</TABLE>





                                     II-5
[{"type": "S-8", "sequence": "1", "description": "FORM S-8", "secsgml_size_bytes": 15968}]
{"company-data": {"conformed-name": "CECO ENVIRONMENTAL CORP", "cik": "0000003197", "assigned-sic": "3564", "irs-number": "132566064", "state-of-incorporation": "NY", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "S-8", "act": "33", "file-number": "033-62377", "film-number": "95570541"}, "business-address": {"street1": "111 ELIZABETH ST STE 600", "city": "TORONTO ONTARIO MSG", "state": "A6", "phone": "4165936543"}, "mail-address": {"street1": "111 ELIZABETH STREET SUITE 600", "city": "TORONTO ONTARIO", "state": "A6"}, "former-company": [{"former-conformed-name": "API ENTERPRISES INC", "date-changed": "19920703"}, {"former-conformed-name": "ALARM PRODUCTS INTERNATIONAL INC", "date-changed": "19851210"}]}
1

                       SECURITIES AND EXCHANGE COMMISSION

                            WASHINGTON, D.C. 20549        

                                    FORM S-8

                             REGISTRATION STATEMENT

                                     under

                          THE SECURITIES ACT OF 1933      

                           CECO ENVIRONMENTAL CORP.                   
            (Exact name of registrant as specified in its character)

       New York                                                13-2566064
(State or other jurisdiction                                   (I.R.S. Employer
  of incorporation)                                            Identification
                                                               Number)

111 Elizabeth Street Suite 600, Toronto, Ontario CANADA              M5G 1P7
(Address of Principal Executive Officers)                          (Zip Code)

                    1995 Consulting Agreement Stock Options
                           (Full Title of the Plans)

                             Leslie J. Weiss, Esq.
                         Sugar, Friedberg & Felsenthal
                            30 North LaSalle Street
                                   Suite 2600
                            Chicago, Illinois  60602          
                    (Name and address of agent for service)

                                 (312) 704-9400                 
                    (Telephone number, including area code,
                             of agent for service)

Approximate date of commencement of proposed sale to the public:
As soon As Practicable After Registration Statement Becomes
Effective.

                               Page 1 of 12 Pages

                         Exhibit Index Begins on Page 8
                 (Facing Page Continued on the Following Page)
2

                         (Continuation of Facing Page)

                        CALCULATION OF REGISTRATION FEE
- ---------------------------------------------------------------------------------------------------------------------------- 
                                                          Proposed                 Proposed
 Title of                                                  Maximum                 Maximum
Securities                 Amount                         Offering                 Aggregate             Amount of
 to be                     to be                          Price Per                Offering             Registration
Registered              Registered                         Share                    Price                   Fee             
- ----------------------------------------------------------------------------------------------------------------------------
Common Shares,             1,000,000                        $2.25                     $2,250,000         (1) $776.25
par value $0.01
per share

- ---------------------------------------------------------------------------------------------------------------------------- 
Total                      1,000,000                        $2.25                     $2,250,000             $776.25         
- ----------------------------------------------------------------------------------------------------------------------------
(1) Estimated pursuant to Rule 457(h)(i) for the shares as to which options
    have been granted pursuant to the 1995 Consulting Agreement Stock Options.

    Pursuant to Rule 416(c) under the Securities Act of 1933, as amended, this
    Registration Statement also covers such additional indeterminate number of
    shares as may become issuable pursuant to anti-dilution and adjustment
    provisions of any options to purchase shares registered hereby.
3

                                     PART I

                INFORMATION REQUIRED IN SECTION 10(A) PROSPECTUS

        The document(s) containing the information specified in part I of Form
S-8 will be sent or given to the applicable consultant as specified by Rule
428(b)(1) of the Securities Act of 1933, as amended (the "Securities Act"). Such
documents are not being filed with or included in this Form S-8 (by
incorporation by reference or otherwise) in accordance with the rules and
regulations of the Securities and Exchange Commission (the "SEC").  These
documents and the documents incorporated by reference into this Registration
Statement pursuant to Item 3 of Part II of this Registration Statement, taken
together, constitute a prospectus that meets the requirements of Section 10(a)
of the Securities Act.
4

                                    PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

Item 3.  Incorporation of Documents by Reference.

         The following documents filed with the Commission (File No. 0-7099)
pursuant to the Securities Exchange Act of 1934 are incorporated by reference
into this Registration Statement.

    a.   The Company's Annual Report on Form 10-KSB for the fiscal year ended
December 31, 1994.

    b.   The Company's reports on From 10-QSB for the quarters ending March 31,
1995 and June 30, 1995.

    c.   The description of the Company's Common Stock, $0.01 par value, 
contained in the Company's registration statement on Form 10 filed pursuant to
Section 12(g) of the Securities Exchange Act of 1934 on April 27, 1973, which 
was declared effective on September 26, 1973, including any subsequent 
amendment or any report or other filing with the Securities and Exchange 
Commission updating such description.

    d.   All documents subsequently filed by the Registrant pursuant to Sections
13(a), 13(c), 14 and 15(d) of the Securities Exchange Act of 1934, prior to the
filing of a post-effective amendment which indicates that all the securities
offered have been sold or which registers all the securities then remaining
unsold, shall be deemed to be incorporated by reference in the Registration
Statement and to be part thereof from the date of filing of such documents.

Item 4.  Description of Securities.

         Not Applicable.

Item 5.  Interest of Named Experts and Counsel.

         Not Applicable.

Item 6.  Indemnification of Officers and Directors.

         The Company's By-laws provide that the Company shall indemnify any
person made, or threatened to be made, a party to an action or proceeding,
whether civil or criminal or investigative (a "proceeding"), including an action
by or in the right of the Company or any other corporation of any type or kind,
domestic or foreign, or any partnership, joint venture, trust, employee benefit
plan or other enterprise, which any director or officer of the Company served in
any capacity at the request of the Company, by reason of the fact that he, his
testator or intestate, was a director or officer of the Company, or served such
other corporation, partnership, joint venture, trust, employee benefit plan or
other enterprise in any capacity, against judgment, fines, amounts paid in
settlement and reasonable expenses, including attorney's

                                     II-1
5

fees actually and necessarily incurred as a result of such proceeding, or any
appeal therein, if such director or officer acted, in good faith, for a purpose
which he reasonably believed to be in, or, in the case of service for any other
corporation or any partnership, joint venture, trust, employee benefit plan or
other enterprise, not opposed to, the best interests of the Company  and, in
criminal proceedings, in addition, had no reasonable cause to believe that his
conduct was unlawful.

        Any determination as to whether a person has met an applicable standard
of conduct shall be made in accordance with the provisions of the Business
Corporation Law of the State of New York.

        No indemnification shall be made to or on behalf of any person if a
judgment or other final adjudication adverse to such person establishes that his
acts were committed in bad faith or were the result of active and deliberate
dishonesty and were material to the cause of action so adjudicated, or that he
personally gained in fact a financial profit or other advantage to which he was
not legally entitled.

        The Company's indemnification provisions shall be enforced to the
fullest extent permitted under law.

Item 7.    Exemption from Registration Claimed.

           Not Applicable.

Item 8.    Exhibits.

           Exhibit
           Number                                    Description
           -------                                   -----------

           10(a)                           Consulting Agreement among the
                                           Company, Robert A. Lerman and
                                           John F. Ferraro, dated as of
                                           April 1, 1995.

           23                              Consent of Margolis & Company P.C.

Item 9.    Undertakings.

(1)        The undersigned Registrant hereby undertakes:

                (a)  to file, during any period in which offers or sales are
           being made, a post-effective amendment to this Registration Statement
           (i) to include any prospectus required by section 10(a)(3) of the
           Securities Act of 1933; (ii) to reflect in the prospectus any facts
           or events arising after the effective date of the Registration 
           Statement (or the most recent post-effective amendment thereof)

                                     II-2
6
      which, individually or in the aggregate, represent a fundamental change
      in the information set forth in the Registration Statement; and (iii) to
      include any material information with respect to the plan of distribution
      not previously disclosed in the Registration Statement or any material
      change to such information in the Registration Statement; provided,
      however, that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply to
      information required to be included in a post-effective amendment by those
      paragraphs which are contained in periodic reports filed by the
      undersigned Registrant pursuant to Section 13 or 15(d) of the Securities
      Exchange Act of 1934 that are incorporated by reference in this
      Registration Statement;

          (b)  that, for the purpose of determining any liability under the
      Securities Act of 1933, each such post-effective amendment shall be deemed
      to be a new registration statement relating to the securities offered
      therein, and the offering of such securities at that time shall be deemed
      to be the initial bona fide offering thereof;

          (c)  to remove from registration by means of a post-effective 
      amendment any of the securities being registered which remain unsold at 
      the termination of the offering.

(2)      The undersigned Registrant hereby undertakes that, for purposes of
      determining any liability under the Securities Act of 1933, each filing
      of the Registrant's annual report pursuant to Section 13(a) or 15(d) of
      the Securities Exchange Act of 1934 that is incorporated by reference in
      the Registration Statement shall be deemed to be a new registration
      statement relating to the securities offered therein and the offering of
      such securities at that time shall be deemed to be the initial bona fide
      offering thereof.

(3)      Insofar as indemnification for liabilities arising under the Securities
      Act of 1933 may be permitted to directors, officers and controlling
      persons of the 1Registrant pursuant to the foregoing provisions, or
      otherwise, the Registrant has been advised that in the opinion of the
      Securities and Exchange Commission such indemnification is against public
      policy as expressed in the Act and is, therefore, unenforceable.  In the
      even that a claim for indemnification against such liabilities (other
      than the payment by the Registrant of expenses incurred or paid by a
      director, officer or controlling person of the Registrant in the
      successful defense of any action, suit or proceeding) is asserted by such
      director, officer or controlling person in connection with the securities
      being registered, the Registrant will, unless in the opinion of its
      counsel the matter has been settled by controlling precedent, submit to a
      court of appropriate jurisdiction the question whether such
      indemnification by it is against public policy as expressed in the act
      and will be governed by the final adjudication of such issue.

                                     II-3
7

                                   SIGNATURES

        Pursuant to the requirements of the Securities Act of 1933, as amended,
the Registrant certifies that it has reasonable grounds to believe that it meets
all of the requirements for filing on Form S-8 and has duly caused this
Registration Statement to be singed on its behalf by the undersigned, thereunto
duly authorized, in the City of Toronto, Province of Ontario, on this 29th day
of August, 1995.

                                                    CECO ENVIRONMENTAL CORP.

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

        Pursuant to the requirements of the Securities Act of 1933, as amended,
this Registration Statement has been signed below by the following persons in
the capacities and on the dates indicated.

Date: August 29, 1995                                   /s/ Phillip DeZwirek  
                                                        ------------------------
                                                        Phillip DeZwirek
                                                        Chief Executive Officer,
                                                        Chief Financial Officer,
                                                        Director

Date: August 29, 1995                                   /s/ Jason Louis DeZwirek
                                                        ------------------------
                                                        Jason Louis DeZwirek
                                                        Director

Date: August 29, 1995                                   /s/ Josephine Grivas  
                                                        ------------------------
                                                        Josephine Grivas
                                                        Director

                                     II-4
8

                                 EXHIBIT INDEX
Exhibit                                                     Page
 Number                    Document                          Number
 -------                   --------                          ------
10(a)                  Consulting Agreement among the        9
                        Company, Robert A. Lerman and
                        John F. Ferraro, dated as of
                        April 1, 1995

 25                     Consent of Margolis & Company P.C.    12
II-5