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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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<SEC-DOCUMENT>0000003197-09-000001.txt : 20091207
<SEC-HEADER>0000003197-09-000001.hdr.sgml : 20091207
<ACCEPTANCE-DATETIME>20091207133555
ACCESSION NUMBER:		0000003197-09-000001
CONFORMED SUBMISSION TYPE:	D
PUBLIC DOCUMENT COUNT:		1
ITEM INFORMATION:		Rule 506
FILED AS OF DATE:		20091207
DATE AS OF CHANGE:		20091207
EFFECTIVENESS DATE:		20091207

FILER:

	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:		D
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	021-00319-7B
		FILM NUMBER:		091225687

	BUSINESS ADDRESS:	
		STREET 1:		3120 FORRER STREET
		CITY:			CINCINNATI
		STATE:			OH
		ZIP:			45209
		BUSINESS PHONE:		4165936543

	MAIL ADDRESS:	
		STREET 1:		505 UNIVERSITY AVENUE
		STREET 2:		SUITE 1400
		CITY:			TORONTO
		STATE:			A6
		ZIP:			M5G 1X3

	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
</SEC-HEADER>
<DOCUMENT>
<TYPE>D
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<edgarSubmission>

    <schemaVersion>X0603</schemaVersion>

    <submissionType>D</submissionType>

    <testOrLive>LIVE</testOrLive>

    <primaryIssuer>
        <cik>0000003197</cik>
        <entityName>CECO ENVIRONMENTAL CORP</entityName>
        <issuerAddress>
            <street1>3120 FORRER STREET</street1>
            <city>CINCINNATI</city>
            <stateOrCountry>OH</stateOrCountry>
            <zipCode>45209</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>4165936543</issuerPhoneNumber>
        <jurisdictionOfInc>DELAWARE</jurisdictionOfInc>
        <edgarPreviousNameList>
            <previousName>API ENTERPRISES INC</previousName>
            <previousName>ALARM PRODUCTS INTERNATIONAL INC</previousName>
        </edgarPreviousNameList>
        <entityType>Corporation</entityType>
        <yearOfInc>
            <overFiveYears>true</overFiveYears>
        </yearOfInc>
    </primaryIssuer>

    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Richard</firstName>
                <lastName>Blum</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>3120 Forrer Street</street1>
                <city>Cincinnati</city>
                <stateOrCountry>OH</stateOrCountry>
                <zipCode>45209</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Arthur</firstName>
                <lastName>Cape</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>4832 Melrose Avenue</street1>
                <city>Montreal</city>
                <stateOrCountry>A8</stateOrCountry>
                <zipCode>H3X 3P5</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Jason</firstName>
                <lastName>Dezwirek</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>2300 Yonge Street, Suite 1710</street1>
                <street2>P.O. Box 2408</street2>
                <city>Toronto</city>
                <stateOrCountry>A6</stateOrCountry>
                <zipCode>M4P 1E4</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Phillip</firstName>
                <lastName>Dezwirek</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>2300 Yonge Street, Suite 1710</street1>
                <street2>P.O. Box 2408</street2>
                <city>Toronto</city>
                <stateOrCountry>A6</stateOrCountry>
                <zipCode>M4P 1E4</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Thomas</firstName>
                <lastName>Flaherty</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>6 Heron Road</street1>
                <city>Mustic</city>
                <stateOrCountry>CT</stateOrCountry>
                <zipCode>06355</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Ronald</firstName>
                <lastName>Krieg</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>20720 State Route 1</street1>
                <city>Guilford</city>
                <stateOrCountry>IN</stateOrCountry>
                <zipCode>47022</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Donald</firstName>
                <lastName>Wright</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>3562 Ethan Allen Avenue</street1>
                <city>San Diego</city>
                <stateOrCountry>CA</stateOrCountry>
                <zipCode>92117</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>David</firstName>
                <lastName>Blum</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>3120 Forrer Street</street1>
                <city>Cincinnati</city>
                <stateOrCountry>OH</stateOrCountry>
                <zipCode>45209</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Dennis</firstName>
                <lastName>Blazer</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>3120 Forrer Street</street1>
                <city>Cincinnati</city>
                <stateOrCountry>OH</stateOrCountry>
                <zipCode>45209</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
    </relatedPersonsList>

    <offeringData>
        <industryGroup>
            <industryGroupType>Manufacturing</industryGroupType>
        </industryGroup>
        <issuerSize>
            <revenueRange>Decline to Disclose</revenueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>false</isAmendment>
            </newOrAmendment>
            <dateOfFirstSale>
                <value>2009-11-26</value>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>false</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isDebtType>true</isDebtType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>false</isBusinessCombinationTransaction>
            <clarificationOfResponse></clarificationOfResponse>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>800000</minimumInvestmentAccepted>
        <salesCompensationList></salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>800000</totalOfferingAmount>
            <totalAmountSold>800000</totalAmountSold>
            <totalRemaining>0</totalRemaining>
            <clarificationOfResponse></clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>1</totalNumberAlreadyInvested>
        </investors>
        <salesCommissionsFindersFees>
            <salesCommissions>
                <dollarAmount>0</dollarAmount>
            </salesCommissions>
            <findersFees>
                <dollarAmount>0</dollarAmount>
            </findersFees>
            <clarificationOfResponse></clarificationOfResponse>
        </salesCommissionsFindersFees>
        <useOfProceeds>
            <grossProceedsUsed>
                <dollarAmount>800000</dollarAmount>
                <isEstimate>true</isEstimate>
            </grossProceedsUsed>
            <clarificationOfResponse>Funds are to be used to repay existing convertible debt held by an affiliate of related persons and general working capital.</clarificationOfResponse>
        </useOfProceeds>
        <signatureBlock>
            <authorizedRepresentative>false</authorizedRepresentative>
            <signature>
                <issuerName>CECO ENVIRONMENTAL CORP</issuerName>
                <signatureName>dennis w. blazer</signatureName>
                <nameOfSigner>Dennis W. Blazer</nameOfSigner>
                <signatureTitle>CFO</signatureTitle>
                <signatureDate>2009-12-03</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
</edgarSubmission>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----
