SECURITIES AND EXCHANGE COMMISSION
                              Washington, DC 20549

                                  SCHEDULE 13G
                                 (Rule 13d-102)

                                (Amendment No. 1)

           INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO
            RULES 13d-1(b), (c) AND (d) AND AMENDMENTS THERETO FILED
                            PURSUANT TO RULE 13d-2(b)


                            CECO ENVIRONMENTAL CORP.
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                                (Name of Issuer)


                                  Common Stock
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                         (Title of Class of Securities)


                                    125141101
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                                 (CUSIP Number)

                                 April 14, 2005
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             (Date of Event Which Requires Filing of this Statement)


Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

      [ ]         Rule 13d-1(b)
      [X]         Rule 13d-1(c)
      [ ]         Rule 13d-1(d)


CUSIP No. 13G Page 2 of 4 125141101 1 NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) Harvey Sandler Revocable Trust 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [ ] 3 SEC USE ONLY 4 CITIZENSHIP OR PLACE OF ORGANIZATION Florida NUMBER OF 5 SOLE VOTING POWER SHARES BENEFICIALLY 1,042,306 OWNED BY EACH 6 SHARED VOTING POWER REPORTING PERSON WITH 0 7 SOLE DISPOSITIVE POWER 1,042,306 8 SHARED DISPOSITIVE POWER 0 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,042,306 shares of Common Stock 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 10.4% 12 TYPE OF REPORTING PERSON OO

CUSIP No. 13G Page 3 of 4 125141101 This Amendment No. 1 to Schedule 13G (this "Statement") relates to the common stock, par value $0.01 per share (the "Common Stock"), of CECO Environmental Corp. (the "Issuer"). This Statement supplementally amends the initial statement on Schedule 13G, filed on April 8, 2005 (the "Initial Statement"), by Harvey Sandler Revocable Trust. This Amendment No. 1 is being filed by Harvey Sandler Revocable Trust to report that Harvey Sandler Revocable Trust is the beneficial owner of more than ten percent of the outstanding Common Stock of the Issuer. Item 4. Ownership. Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1. Harvey Sandler Revocable Trust (a) Amount beneficially owned: 1,042,306 shares of Common Stock, $0.01 par value, of CECO Environmental Corp. (b) Percent of class: 10.4% (c) Number of shares as to which the person has: (i) Sole power to vote or to direct the vote: 1,042,306 shares (ii) Shared power to vote or to direct the vote: 0 shares (iii) Sole power to dispose or to direct the disposition of: 1,042,306 shares (iv) Shared power to dispose or to direct the disposition of: 0 shares Item 10. Certifications. By signing below the undersigned certifies that, to the best of its knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.

CUSIP No. 13G Page 4 of 4 125141101 SIGNATURE --------- After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. Date: April 21, 2005 HARVEY SANDLER REVOCABLE TRUST By:/s/ Harvey Sandler ---------------------------- Name: Harvey Sandler Title: Sole Trustee