CECO Environmental (CECO) DEFA14A Additional proxy soliciting materials

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

SCHEDULE 14A

(RULE 14a-101)

PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE

SECURITIES EXCHANGE ACT OF 1934

Filed by the Registrant  ☒                             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
☒	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)

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See the reverse side of this notice to obtain proxy materials and voting instructions. *** Exercise Your Right to Vote *** Important Notice Regarding the Availability of Proxy Materials for the Stockholder Meeting to Be Held on June 11, 2020. You are receiving this communication because you hold shares in the above named company. This is not a ballot. You cannot use this notice to vote these shares. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. You may view the proxy materials online at www.proxyvote.com or easily request a paper copy (see reverse side). We encourage you to access and review all of the important information contained in the proxy materials before voting. Meeting Information Meeting Type: Annual Meeting For holders as of: April 15, 2020 Date: Time: 8:00 AM CDT Location: 14651 N. Dallas Parkway Suite 118 Dallas, Texas 75254 or by means of remote communication, in which case we will announce such decision and how to participate 0000463594_1 R1.0.1.18 CECO ENVIRONMENTAL CORP.

Please Choose One of the Following Voting Methods Vote In Person: Many stockholder meetings have attendance requirements including, but not limited to, the possession of an attendance ticket issued by the entity holding the meeting. Please check the meeting materials for any special requirements for meeting attendance. At the meeting, you will need to request a ballot to vote these shares Vote By Internet: To vote now by Internet, go to www.proxyvote.com. Have the information that is printed in the box marked by the arrow available and follow the instructions. Vote By Mail: You can vote by mail by requesting a paper copy of the materials, which will include a proxy card. How To Vote Before You Vote How to Access the Proxy Materials Proxy Materials Available to VIEW or RECEIVE: How to View Online: Have the information that is printed in the box marked by the arrow (located on the following page) and visit: www.proxyvote.com. How to Request and Receive a PAPER or E-MAIL Copy: If you want to receive a paper or e-mail copy of these documents, you must request one. There is NO charge for requesting a copy. Please choose one of the following methods to make your request: 1) BY INTERNET: www.proxyvote.com 2) BY TELEPHONE: 1-800-579-1639 3) BY E-MAIL*: sendmaterial@proxyvote.com * If requesting materials by e-mail, please send a blank e-mail with the information that is printed in the box marked by the arrow (located on the following page) in the subject line. 0000463594_2 R1.0.1.18 1. Notice & Proxy Statement 2. Annual Report Requests, instructions and other inquiries sent to this e-mail address will NOT be forwarded to your investment advisor. Please make the request as instructed above on or before May 28, 2020 to facilitate timely delivery.

Voting items 0000463594_3 R1.0.1.18 The Board of Directors recommends you vote FOR the following: 1. Election of Directors Nominees 01 Jason DeZwirek 02 Eric M. Goldberg 03 David B. Liner 04 Claudio A. Mannarino 05 Munish Nanda 06 Jonathan Pollack 07 Valerie Gentile Sachs 08 Dennis Sadlowski The Board of Directors recommends you vote FOR proposals 2, 3 and 4. 2 To approve, on an advisory basis, the compensation paid to the Company’s named executive officers. 3 To approve the CECO Environmental Corp. 2020 Employee Stock Purchase Plan. 4 To ratify the appointment of BDO USA, LLP as our independent registered public accounting firm for 2020. NOTE: To transact such other business as may properly come before the meeting or any adjournments thereof.

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