<SEC-DOCUMENT>0001140361-13-019317.txt : 20130508
<SEC-HEADER>0001140361-13-019317.hdr.sgml : 20130508
<ACCEPTANCE-DATETIME>20130508094949
ACCESSION NUMBER:		0001140361-13-019317
CONFORMED SUBMISSION TYPE:	SC 13D
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20130508
DATE AS OF CHANGE:		20130508

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 13D
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-19763
		FILM NUMBER:		13822967

	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:			MET PRO CORP
		CENTRAL INDEX KEY:			0000065201
		STANDARD INDUSTRIAL CLASSIFICATION:	INDUSTRIAL & COMMERCIAL FANS & BLOWERS & AIR PURIFYING EQUIP [3564]
		IRS NUMBER:				231683282
		STATE OF INCORPORATION:			PA
		FISCAL YEAR END:			0131

	FILING VALUES:
		FORM TYPE:		SC 13D

	BUSINESS ADDRESS:	
		STREET 1:		160 CASSELL ROAD
		CITY:			HARLEYSVILLE
		STATE:			PA
		ZIP:			19438
		BUSINESS PHONE:		2157236751

	MAIL ADDRESS:	
		STREET 1:		160 CASSELL ROAD
		STREET 2:		BOX 144
		CITY:			HARLEYSVILLE
		STATE:			PA
		ZIP:			19438

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MET PRO WATER TREATMENT CORP
		DATE OF NAME CHANGE:	19740924

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MET PRO INC
		DATE OF NAME CHANGE:	19661026
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13D
<SEQUENCE>1
<FILENAME>formsc13d.htm
<DESCRIPTION>MET-PRO CORP SC 13D 4-21-2013 (CECO ENVIRONMENTAL CORP)
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<font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt; FONT-WEIGHT: bold">&#160;(Name of Issuer)</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt; FONT-WEIGHT: bold">MET-PRO CORPORATION</font></div>

<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt; FONT-WEIGHT: bold">160 Cassell Road, P.O. Box 144</font></div>

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<font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt; FONT-WEIGHT: bold">(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)</font></div>

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<div style="TEXT-INDENT: 36pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule13D, and is filing this schedule because of &#167;&#167;240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.</font></div>

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<td width="40%"><font style="FONT-FAMILY: times new roman; FONT-SIZE: 10pt">CUSIP No. 125141 10-1</font></td>
<td width="60%"><font style="FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Schedule 13D</font></td>
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<div>&#160;</div>
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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">NAME OF REPORTING PERSONS:</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Met-Pro Corporation</font></div>
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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">2</font></div>
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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">3</font></div>
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<td align="left" valign="top" width="92%" style="BORDER-BOTTOM: black 2px solid; BORDER-LEFT: black 2px solid; BORDER-RIGHT: black 2px solid">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">SEC USE ONLY</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">6</font></div>
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<td align="left" valign="top" width="92%" style="BORDER-LEFT: black 2px solid; BORDER-RIGHT: black 2px solid">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">CITIZENSHIP OR PLACE OF ORGANIZATION</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Pennsylvania</font></div>
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<div style="TEXT-ALIGN: center; TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">7</font></div>
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<td align="left" valign="top" width="77%" style="BORDER-BOTTOM: black 2px solid; BORDER-TOP: black 2px solid; BORDER-RIGHT: black 2px solid">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">SOLE VOTING POWER</font></div>

<div style="TEXT-INDENT: 0pt; DISPLAY: block">&#160;</div>

<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">0</font></div>
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<td valign="top" width="15%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: center; BORDER-LEFT: black 2px solid">
<div style="TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">BENEFICIALLY </font></div>

<div><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">OWNED BY </font></div>

<div><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">EACH </font></div>
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<td valign="top" width="8%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: center; BORDER-LEFT: black 2px solid; BORDER-RIGHT: black 2px solid">
<div style="TEXT-ALIGN: center; TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">8</font></div>
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<td align="left" valign="top" width="77%" style="BORDER-BOTTOM: black 2px solid; BORDER-RIGHT: black 2px solid">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">SHARED VOTING POWER</font></div>

<div style="TEXT-INDENT: 0pt; DISPLAY: block">&#160;</div>

<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">4,657,347</font></div>
</td>
</tr><tr>
<td valign="top" width="15%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: center; BORDER-LEFT: black 2px solid">
<div><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">REPORTING </font></div>

<div><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">PERSON WITH</font></div>
</td>
<td valign="top" width="8%" style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: center; BORDER-LEFT: black 2px solid; BORDER-RIGHT: black 2px solid">
<div style="TEXT-ALIGN: center; TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">9</font></div>
</td>
<td align="left" valign="top" width="77%" style="BORDER-BOTTOM: black 2px solid; BORDER-RIGHT: black 2px solid">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">SOLE DISPOSITIVE POWER</font></div>

<div style="TEXT-INDENT: 0pt; DISPLAY: block">&#160;</div>

<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">0</font></div>
</td>
</tr><tr>
<td valign="top" width="15%" style="BORDER-LEFT: black 2px solid"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160; </font></td>
<td valign="top" width="8%" style="TEXT-ALIGN: center; BORDER-LEFT: black 2px solid; BORDER-RIGHT: black 2px solid">
<div style="TEXT-ALIGN: center; TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">10</font></div>
</td>
<td align="left" valign="top" width="77%" style="BORDER-RIGHT: black 2px solid">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">SHARED DISPOSITIVE POWER</font></div>

<div style="TEXT-INDENT: 0pt; DISPLAY: block">&#160;</div>

<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">0</font></div>
</td>
</tr></table>
</div>

<div align="left">
<table cellpadding="0" cellspacing="0" width="100%" style="FONT-FAMILY: times new roman; FONT-SIZE: 10pt; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">
<tr>
<td align="left" valign="top" width="8%" style="BORDER-BOTTOM: black 2px solid; BORDER-LEFT: black 2px solid; BORDER-TOP: black 2px solid">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">11</font></div>
</td>
<td align="left" valign="top" width="92%" style="BORDER-BOTTOM: black 2px solid; BORDER-LEFT: black 2px solid; BORDER-TOP: black 2px solid; BORDER-RIGHT: black 2px solid">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON</font></div>

<div style="TEXT-INDENT: 0pt; DISPLAY: block">&#160;</div>

<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">4,657,347</font></div>
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</tr><tr>
<td align="left" valign="top" width="8%" style="BORDER-BOTTOM: black 2px solid; BORDER-LEFT: black 2px solid">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">12</font></div>
</td>
<td align="left" valign="top" width="92%" style="BORDER-BOTTOM: black 2px solid; BORDER-LEFT: black 2px solid; BORDER-RIGHT: black 2px solid">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)</font></div>

<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: wingdings; FONT-SIZE: 10pt">&#168;</font></div>

<div style="TEXT-INDENT: 0pt; DISPLAY: block">&#160;</div>
</td>
</tr><tr>
<td align="left" valign="top" width="8%" style="BORDER-BOTTOM: black 2px solid; BORDER-LEFT: black 2px solid">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">13</font></div>
</td>
<td align="left" valign="top" width="92%" style="BORDER-BOTTOM: black 2px solid; BORDER-LEFT: black 2px solid; BORDER-RIGHT: black 2px solid">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">PERCENT OF CLASS REPRESENTED IN ROW (11)</font></div>

<div style="TEXT-INDENT: 0pt; DISPLAY: block">&#160;</div>

<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">26%</font></div>
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</tr><tr>
<td align="left" valign="top" width="8%" style="BORDER-BOTTOM: black 2px solid; BORDER-LEFT: black 2px solid">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">14</font></div>
</td>
<td align="left" valign="top" width="92%" style="BORDER-BOTTOM: black 2px solid; BORDER-LEFT: black 2px solid; BORDER-RIGHT: black 2px solid">
<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)</font></div>

<div style="TEXT-INDENT: 0pt; DISPLAY: block">&#160;</div>

<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">CO</font></div>
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<div style="TEXT-INDENT: 0pt; DISPLAY: block">&#160;</div>

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<div id="PN" style="PAGE-BREAK-AFTER: always; WIDTH: 100%">
<div style="TEXT-ALIGN: center; WIDTH: 100%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 8pt">2</font></div>

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<div id="HDR">
<div id="GLHDR" style="WIDTH: 100%" align="right"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 8pt">&#160; </font></div>
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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">CUSIP No. 412824104</font></div>

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<div style="TEXT-INDENT: 0pt; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt; FONT-WEIGHT: bold">Item 1.</font></div>
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<div align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt; FONT-WEIGHT: bold">Security and Issuer</font></div>
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<div style="TEXT-INDENT: 0pt; DISPLAY: block"><br>
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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">This statement on Schedule 13D relates to the shares of common stock, $0.01 par value (the &#8220;CECO Common Stock&#8221;), of CECO Environmental Corp., a Delaware corporation (&#8220;CECO&#8221;).&#160;&#160;CECO&#8217;s principal executive offices are located at 4625 Red Bank Road, Cincinnati, OH 45227.</font></div>

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<div style="TEXT-INDENT: 0pt; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt; FONT-WEIGHT: bold">Item 2.</font></div>
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<div align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt; FONT-WEIGHT: bold">Identity and Background</font></div>
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<div style="TEXT-INDENT: 0pt; DISPLAY: block"><br>
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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">(a) - (c) and (f).&#160;&#160;This Schedule 13D is being filed by Met-Pro Corporation, a Pennsylvania corporation (&#8220;Met-Pro&#8221;).&#160;&#160;Met-Pro and its subsidiaries are principally engaged in providing product recovery, pollution control and fluid handling products and services.&#160;&#160;The address of its principal place of business and of its principal office is 160 Cassell Road, PO Box 144, Harleysville, PA 19438.&#160;&#160;The name, residence or business address, citizenship and present principal occupation of each executive officer and director of Met-Pro is set forth in Annex A hereto.</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">(d) - (e).&#160;&#160;During the last five years, neither Met-Pro nor, to the best of its knowledge, any person listed in Annex A hereto, has (i) been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors) or (ii) a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and as a result of such proceeding was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.</font></div>

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<table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="FONT-FAMILY: times new roman; FONT-SIZE: 10pt; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">
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<div style="TEXT-INDENT: 0pt; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt; FONT-WEIGHT: bold">Item 3.</font></div>
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<div align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt; FONT-WEIGHT: bold">Source and Amount of Funds or Other Consideration</font></div>
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<div style="TEXT-INDENT: 0pt; DISPLAY: block"><br>
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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">Met-Pro has obtained beneficial ownership of the indicated shares of CECO Common Stock referenced in this Schedule 13D) in connection with a Voting Agreement with an irrevocable proxy (described in Item 4).&#160;&#160;To the knowledge of Met-Pro, no person named in Annex A hereto has expended, nor expects to expend, funds in connection with Met-Pro&#8217;s beneficial ownership of the CECO Common Stock.</font></div>

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<table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="FONT-FAMILY: times new roman; FONT-SIZE: 10pt; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">
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<div style="TEXT-INDENT: 0pt; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt; FONT-WEIGHT: bold">Item 4.</font></div>
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<div align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt; FONT-WEIGHT: bold">Purpose of Transaction</font></div>
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<div style="TEXT-INDENT: 0pt; DISPLAY: block"><br>
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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">On April 21, 2013, Met-Pro Corporation entered into an Agreement and Plan of Merger (the &#8220;Merger Agreement&#8221;) with CECO, Mustang Acquisition Inc. (&#8220;Merger Sub I&#8221;) and Mustang Acquisition II Inc.&#160;&#160;(&#8220;Merger Sub II&#8221; and together with Merger Sub I, collectively, the &#8220;Merger Subs&#8221;), Delaware corporations which are wholly owned subsidiaries of CECO, providing for the merger of Merger Sub I with and into Met-Pro, followed by the merger of Met-Pro into Merger Sub II (collectively, the &#8220;Merger&#8221;), with Merger Sub II surviving the Merger as a wholly-owned subsidiary of CECO.</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">As an inducement to Met-Pro to enter into the Merger Agreement, Met-Pro entered into a Voting Agreement (the &#8220;Voting Agreement&#8221;), dated as of April 21, 2013, with Phillip DeZwirek, Jason DeZwirek and Icarus Investment Corp. (collectively, the &#8220;Stockholders&#8221;).&#160;&#160;The purpose of the Voting Agreement is to facilitate the transactions contemplated by the Merger Agreement.</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">Pursuant to the Voting Agreement, each of the Stockholders has agreed to vote such Stockholder&#8217;s CECO Common Stock or otherwise cause such Stockholder&#8217;s CECO Common Stock to be voted: (i) in favor of the issuance of CECO Common Stock in connection with the Merger Agreement, the Merger and the transactions contemplated thereby, and (ii) against any action (1) that would result in a breach by CECO, Merger Sub I or Merger Sub II of any their respective covenants, representations or warranties under the Merger Agreement, and (2) that could reasonably be expected to delay or materially interfere with the consummation of the Merger or the fulfillment of Met-Pro&#8217;s, CECO&#8217;s, Merger Sub I&#8217;s or Merger Sub II&#8217;s conditions under the Merger Agreement, including any change to the rights of any of CECO&#8217;s shares. In addition, each of the Stockholders has irrevocably granted to Met-Pro a proxy to vote such Stockholder's CECO Common Stock, and has appointed Met-Pro as such Stockholder&#8217;s attorney-in-fact until the termination or expiration of the Voting Agreement in accordance with its terms. The Voting Agreement also contains certain restrictions upon the transfer of the respective Stockholder&#8217;s CECO Common Stock. The Voting Agreement terminates upon the consummation of the Merger or the earlier termination of the Merger Agreement.</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">The Merger Agreement is described in Met-Pro Corporation&#8217;s Current Report on Form 8-K dated April 21, 2013, filed on April 22, 2013, and the foregoing descriptions of the transactions contemplated by the Merger Agreement and the Voting Agreement are qualified in their entirety by reference to such agreements, copies of which are attached as Exhibits 99.1 and 99.2 hereto and incorporated herein by reference.</font></div>

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<div style="TEXT-ALIGN: center; WIDTH: 100%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 8pt">3</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">To the knowledge of Met-Pro, this Item 4 does not apply to any person named in Annex A hereto.</font></div>

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<div style="TEXT-INDENT: 0pt; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt; FONT-WEIGHT: bold">Item 5.</font></div>
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<div align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt; FONT-WEIGHT: bold">Interest in Securities of the Issuer</font></div>
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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">(a)&#160;&#160;As a result of the Voting Agreement, Met-Pro may be deemed to beneficially own the 4,657,347 shares of CECO Common Stock currently owned of record by the Stockholders.&#160;&#160;Such CECO Common Stock represents approximately 26% of the outstanding CECO Common Stock (based upon the 17,871,922 shares reported by CECO to be issued and outstanding as of April 19, 2013 in the Merger Agreement).&#160;&#160;To the knowledge of Met-Pro, none of the persons listed in Annex A hereto beneficially owns any CECO Common Stock.</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">(b)&#160;&#160;Met-Pro may be deemed to share voting power with respect to the 4,657,347 shares of CECO Common Stock subject to the Voting Agreement with the Stockholders.&#160;&#160;To the knowledge of Met-Pro, this Item 5(b) does not apply to any person named in Annex A hereto.<font id="TAB2" style="LETTER-SPACING: 3pt; COLOR: black">&#160;</font></font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">(c) Except as described above in Item 4, neither Met-Pro nor, to the knowledge of Met-Pro, any of the persons listed in Annex A hereto has effected any transactions in the securities of CECO during the past sixty days.</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">(d)&#160;and (e). Not applicable.</font></div>

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<div style="TEXT-INDENT: 0pt; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt; FONT-WEIGHT: bold">Item 6.</font></div>
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<div align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt; FONT-WEIGHT: bold">Contracts, Arrangements, Understandings or Relationships with Respect to Securities of the Issuer</font></div>
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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">Other than as described in Items 3, 4 and 5 and the agreements incorporated by reference and set forth as exhibits hereto, neither Met-Pro nor, to the knowledge of Met-Pro, any of the persons named in Annex A hereto is a party to any contract, arrangement, understanding or relationship with respect to any securities of CECO.</font></div>

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<div style="TEXT-INDENT: 0pt; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Exhibit 99.1:</font></div>
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<div align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Agreement and Plan of Merger, dated as of April 21, 2013, by and among Met-Pro Corporation, CECO Environmental Corp., Mustang Acquisition Inc. and Mustang Acquisition II Inc. (incorporated by reference to Exhibit 2.1 to the Current Report on 8-K dated April 21, 2013, filed by Met-Pro Corporation with the Commission on April 22, 2013).</font></div>
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<div align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Voting Agreement, dated as of April 21, 2013, by and among Met-Pro Corporation, Phillip DeZwirek, Jason DeZwirek and Icarus Investment Corp. (incorporated by reference to Exhibit 10cx to the Current Report on 8-K dated April 21, 2013, filed by Met-Pro Corporation with the Commission on April 22, 2013).</font></div>
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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">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.</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">Dated:&#160;&#160;May 8, 2013</font></div>

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<td colspan="2" valign="top" width="49%"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt; FONT-WEIGHT: bold">MET-PRO CORPORATION</font></td>
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<td valign="top" width="7%">By:</td>
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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Raymond J. De Hont</font></div>
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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Chief Executive Officer and President</font></div>
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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">EXECUTIVE OFFICERS AND DIRECTORS OF MET-PRO CORPORATION</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">The name, present principal occupation or employment, and the name, principal business and address of any corporation or other organization in which such employment is conducted, of each of the executive officers and directors of Met-Pro Corporation is set forth below. The principal business address of each of the executive officers and directors is 160 Cassell Road, P.O. Box 144, Harleysville, PA 19438. Each executive officer and each director of Met-Pro Corporation is a citizen of the United States. Each director of Met-Pro is engaged in such other businesses and occupations as are set forth in Met-Pro Corporation&#8217;s proxy statement for its 2013 Annual Meeting of Shareholders.</font></div>

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