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 *
  Cook Benton Lowell
 2. Date of Event Requiring Statement (Month/Day/Year)
09/28/2011		 3. Issuer Name and Ticker or Trading Symbol
CECO ENVIRONMENTAL CORP [CECE]
(Last)
(First)
(Middle)
4625 RED BANK ROAD, SUITE 200		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
interim CFO
 5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

CINCINNATI, OH 45227		 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)

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
Option (right to buy) 01/16/2008(1) 01/16/2017 Common Stock 10,000 $ 11.09 D  
Option (right to buy) 12/01/2011(2) 12/01/2018 Common Stock 3,000 $ 1.98 D  
Option (right to buy) 04/29/2011(3) 04/29/2020 Common Stock 6,000 $ 5.26 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Cook Benton Lowell
4625 RED BANK ROAD
SUITE 200
CINCINNATI, OH 45227		       interim CFO  

Signatures

/s/ Benton Lowell Cook 09/30/2011
**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 option was granted on January 16, 2007. It vests in four equal annual installments of 2,500 shares on the anniversary date of the grant, commencing January 16, 2008.
(2) The option was granted on December 1, 2008. The option vests 1,000 shares on each of December 1, 2011, December 1, 2012, and December 1, 2013.
(3) The option was granted on April 29, 2010. It vests in three equal annual installments of 2,000 shares, commencing April 29, 2011.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, See Instruction 6 for procedure.

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