UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

SCHEDULE 14A

(RULE 14a-101)

INFORMATION REQUIRED IN PROXY STATEMENT

SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

Filed by the Registrant  x                             Filed by a party other than the Registrant  ¨

Check the appropriate box:

¨ Preliminary proxy statement

¨ Confidential, for use of the Commission only (as permitted by Rule 14a-6(e)(2))

¨ Definitive proxy statement

x Definitive additional materials

¨ Soliciting material pursuant to Sec. 240.14a-11(c) or Sec. 240.14a-12

CECO ENVIRONMENTAL CORP.

(Name of Registrant as Specified in Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than Registrant)

Payment of filing fee (Check the appropriate box):

x	No Fee Required
¨	Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11
	(1)	Title of each class of securities to which transaction applies:
	(2)	Aggregate number of securities to which transaction applies:
	(3)	Per unit price or other underlying value of transaction computed pursuant to Exchange Act Rule 0-11 (set forth the amount on which the filing fee is calculated and state how it was determined):
	(4)	Proposed maximum aggregate value of transaction:
	(5)	Total fee paid:
¨	Fee paid previously with preliminary materials:
¨	Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid previously. Identify the previous filing by registration statement number, or the Form or Schedule and the date of its filing.
	(1)	Amount previously paid:
	(2)	Form, Schedule or Registration Statement No.:
	(3)	Filing party:
	(4)	Date filed:

ANNUAL MEETING OF STOCKHOLDERS OF

CECO ENVIRONMENTAL CORP.

May 12, 2016

PROXY VOTING INSTRUCTIONS

INTERNET - Access “www.voteproxy.com” and follow the on-screen instructions or scan the QR code with your smartphone. Have your proxy card available when you access the web page. TELEPHONE - Call toll-free 1-800-PROXIES (1-800-776-9437) in the United States or 1-718-921-8500 from foreign countries from any touch-tone telephone and follow the instructions. Have your proxy card available when you call.
Vote online/phone until 11:59 p.m. EDT the day before the meeting. MAIL - Sign, date and mail your proxy card in the envelope provided as soon as possible. IN PERSON - You may vote your shares in person by attending the Annual Meeting. GO GREEN - e-Consent makes it easy to go paperless. With e-Consent, you can quickly access your proxy materials, statements and other eligible documents online, while reducing costs, clutter and paper waste. Enroll today via www.amstock.com to enjoy online access.	COMPANY NUMBER
	ACCOUNT NUMBER

Important Notice Regarding the Availability of Proxy Materials

for the Stockholders Meeting to Be Held on May 12, 2016

Our Annual Report to Stockholders and the Proxy Statement

are available at www.cecoenviro.com/investors.aspx

i  Please detach along perforated line and mail in the envelope provided IF you are not voting via telephone or the Internet.  i

THE BOARD OF DIRECTORS RECOMMENDS A VOTE “FOR” THE ELECTION OF DIRECTORS,

“FOR” PROPOSAL NO. 2 AND “FOR” PROPOSAL NO. 3

.PLEASE SIGN, DATE AND RETURN PROMPTLY IN THE ENCLOSED ENVELOPE. PLEASE MARK YOUR VOTE IN BLUE OR BLACK INK AS SHOWN HERE x

					FOR	AGAINST	ABSTAIN
1. ¨  ¨  ¨	Election of Directors: FOR ALL NOMINEES WITHHOLD AUTHORITY FOR ALL NOMINEES FOR ALL EXCEPT (See instructions below)	NOMINEES: ¡  Jason DeZwirek ¡  Eric M. Goldberg ¡  Jeffrey Lang ¡  Claudio A. Mannarino ¡  Jonathan Pollack ¡  Seth Rudin ¡  Valerie Gentile Sachs ¡  Dennis Sadlowski ¡  Donald A. Wright		2.   To ratify the appointment of BDO USA, LLP as the independent registered public accounting firm of the Company for fiscal year 2016.	¨	¨	¨
				3.   To approve, on an advisory basis, the Company’s named executive officer compensation.	FOR ¨	AGAINST ¨	ABSTAIN ¨
				4.   To transact such other business as may properly come before the meeting or any adjournments thereof.
				THIS PROXY, WHEN PROPERLY EXECUTED, WILL BE VOTED AS DIRECTED BY THE STOCKHOLDER. IF NO SUCH DIRECTIONS ARE MADE, THIS PROXY WILL BE VOTED FOR THE ELECTION OF THE NOMINEES LISTED HEREIN FOR THE BOARD OF DIRECTORS, FOR PROPOSAL 2 AND FOR PROPOSAL 3.
INSTRUCTIONS:    To withhold authority to vote for any individual nominee(s), mark “FOR ALL EXCEPT” and fill in the circle next to each nominee you wish to withhold, as shown here:  l				PLEASE MARK, SIGN, DATE AND RETURN THIS PROXY CARD PROMPTLY USING THE ENCLOSED ENVELOPE.
				MARK “X” HERE IF YOU PLAN TO ATTEND THE MEETING.  ¨
To change the address on your account, please check the box at right and indicate your new address in the address space above. Please note that changes to the registered name(s) on the account may not be submitted via this method.			¨

  Signature of Stockholder     Date:     Signature of Stockholder     Date:    

¢ Note: Please sign exactly as your name or names appear on this Proxy. When shares are held jointly, each holder should sign. When signing as executor, administrator, attorney, trustee or guardian, please give full title as such. If the signer is a corporation, please sign full corporate name by duly authorized officer, giving full title as such. If signer is a partnership, please sign in partnership name by authorized person. ¢