<SEC-DOCUMENT>0001057439-12-000033.txt : 20120201
<SEC-HEADER>0001057439-12-000033.hdr.sgml : 20120201
<ACCEPTANCE-DATETIME>20120201120213
ACCESSION NUMBER:		0001057439-12-000033
CONFORMED SUBMISSION TYPE:	SC 13G
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20120201
DATE AS OF CHANGE:		20120201

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CECO ENVIRONMENTAL CORP
		CENTRAL INDEX KEY:			0000003197
		STANDARD INDUSTRIAL CLASSIFICATION:	INDUSTRIAL & COMMERCIAL FANS & BLOWERS & AIR PURIFYING EQUIP [3564]
		IRS NUMBER:				132566064
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-19763
		FILM NUMBER:		12561588

	BUSINESS ADDRESS:	
		STREET 1:		4625 RED BANK ROAD, SUITE 200
		CITY:			CINCINNATI
		STATE:			OH
		ZIP:			45227
		BUSINESS PHONE:		4165936543

	MAIL ADDRESS:	
		STREET 1:		2300 YONGE STREET, P.O. BOX 2408
		STREET 2:		SUITE 1710
		CITY:			TORONTO
		STATE:			A6
		ZIP:			M4P 1E4

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	API ENTERPRISES INC
		DATE OF NAME CHANGE:	19920703

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ALARM PRODUCTS INTERNATIONAL INC
		DATE OF NAME CHANGE:	19851210

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			THOMSON HORSTMANN & BRYANT INC
		CENTRAL INDEX KEY:			0001057439
		IRS NUMBER:				223508647
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G

	BUSINESS ADDRESS:	
		STREET 1:		501 MERRITT 7
		CITY:			NORWALK
		STATE:			CT
		ZIP:			06851
		BUSINESS PHONE:		2036537060

	MAIL ADDRESS:	
		STREET 1:		501 MERRITT 7
		CITY:			NORWALK
		STATE:			CT
		ZIP:			06851
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G
<SEQUENCE>1
<FILENAME>cece11.txt
<TEXT>
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C.  20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934
(Amendment No. *)

(Name of Issuer)
CECO ENVIRONMENTAL CORP

(Title of Class of Securities)
Common Stock


(CUSIP Number)
125141101

Check the following box if a fee
is being paid with this statement.
 (A fee is not required only if the
 filing person:  (1) has a previous
 statement on file reporting beneficial
 ownership of more than five percent
 of the class of securities described
 in Item 1; and (2) has filed no amendment
 subsequent thereto reporting beneficial
ownership of five percent or less
of such class.) (See Rule 13d-7).

*The remainder of this cover page shall
 be filled out for a reporting persons
initial filing on this form with respect
 to the subject class of securities,
 and for any subsequent amendment
 containing information which would
 alter the disclosures provided in
a prior cover page.

The information required in the
remainder of this cover page shall
 not be deemed to be filed for the
 purpose of Section 18 of the Securities
Exchange Act of 1934 (Act) or otherwise
subject to the liabilities of that section
 of the Act but shall be subject to all
other provisions of the Act (however,
 see the Notes).


1  NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF PERSON
	THOMSON HORSTMANN & BRYANT, INC.
	22-3508647

2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
	N/A

3  SEC USE ONLY

4  CITIZENSHIP OR PLACE OF ORGANIZATION
	A DELAWARE CORPORATION
	NORWALK, CT 06851

5  SOLE VOTING POWER
	688749

6  SHARED VOTING POWER
	0

7  SOLE DISPOSITIVE POWER
	 902602

8  SHARED DISPOSITIVE POWER
	NONE

9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
	902602

10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
	N/A

11  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
	6.23%

12  TYPE OF REPORTING PERSON *
	IA

ITEM 1.
	(A) CECO ENVIRONMENTAL CORP
	(B) 4625 RED BANK ROAD, SUITE 200, CINCINNATI OH 45227

ITEM 2.
	(A) THOMSON HORSTMANN & BRYANT, INC.
	(B) 501 MERRITT 7, NORWALK, CT  06851
	(C) A DELAWARE CORPORATION
	(D) COMMON
	(E) 872391107

ITEM 3.
	(E) INVESTMENT ADVISER REGISTERED UNDER SECTION
203 OF THE INVESTMENT ADVISERS ACT OF 1940

ITEM 4.
	(A)  902602
	(B)  6.23
	(C)	(I)   688749
		(II)	0
		(III)	902602
		(IV)	NONE

ITEM 5.  N/A

ITEM 6.  N/A

ITEM 7.  N/A

ITEM 8.  N/A

ITEM 9.  N/A


ITEM 10. CERTIFICATION
	By signing below I certify that,
to the best of my knowledge and belief,
the securities referred to above were
 acquired in the ordinary course of
business and were not acquired for the
purpose of and do not have the effect of
changing or influencing the control of the
issuer of such securities and were not
 acquired in connection with or as a
participant in any transaction having
 such purposes or effect.

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.

							James Kennedy
							Date:   1/30/12
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
