Ownership Submission
FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  Pollack Jonathan
 2. Date of Event Requiring Statement (Month/Day/Year)
05/17/2011		 3. Issuer Name and Ticker or Trading Symbol
CECO ENVIRONMENTAL CORP [CECE]
(Last)
(First)
(Middle)
2300 YONGE STREET, SUITE 1710		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

TORONTO, A6 M4P 1E4		 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Common Stock 2,300
D
 
Common Stock 2,300
I
By spouse

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
6% Convertible Debenture 11/26/2009 11/26/2014(1) Common Stock 37,500 $ 4 I Footnote (2)
Option (right to buy) 12/13/2010(3) 12/13/2019 Common Stock 65,000 $ 4.05 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Pollack Jonathan
2300 YONGE STREET
SUITE 1710
TORONTO, A6 M4P 1E4		   X      

Signatures

/s/ Jonathan Pollack 05/19/2011
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) The convertible debenture is convertible into common stock of the Company at any time prior to the repayment date. It is payable upon the earlier of (i) November 26, 2014, (ii) the consent of holder, or (iii) upon certain changes of control.
(2) By JMP FAM Holdings Inc., over which filer has sole voting and dispositive control.
(3) The option was issued on December 13, 2009. It vests in five equal annual installments of 13,000 shares on the anniversary date of the grant, commencing December 13, 2010.

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