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EXHIBIT 23.1
CONSENT OF INDEPENDENT REGISTERED
PUBLIC ACCOUNTING FIRM
Board of Directors and Shareholders
CECO Environmental Corp.
Cincinnati, Ohio
We hereby consent to the incorporation by reference in Registration Statement No. 333-130294 on Form S-3 and Registration Statements Nos. 333-33270, 333-143527, and 333-159948 on Forms S-8 of our report dated March 15, 2011, relating to the consolidated financial statements of CECO Environmental Corp., which appears in this Form 10-K.
/s/ BDO USA, LLP
Chicago, Illinois
March 15, 2011