<?xml version="1.0"?>
<ownershipDocument>

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    <documentType>4</documentType>

    <periodOfReport>2012-12-20</periodOfReport>

    <issuer>
        <issuerCik>0000763744</issuerCik>
        <issuerName>DREW INDUSTRIES INC</issuerName>
        <issuerTradingSymbol>DW</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001307217</rptOwnerCik>
            <rptOwnerName>Mereness Scott T</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O LIPPERT COMPONENTS, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>2703 COLLEGE AVENUE</rptOwnerStreet2>
            <rptOwnerCity>GOSHEN</rptOwnerCity>
            <rptOwnerState>IN</rptOwnerState>
            <rptOwnerZipCode>46528</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isOther>1</isOther>
            <otherText>President of Subsidiaries</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

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    <footnotes>
        <footnote id="F1">These performance-based Deferred Stock Unit dividends will vest  at the rate of 2% for each $0.01 that the Company's earnings per share in any year in the period 2013 - 2017 exceeds $1.60.</footnote>
        <footnote id="F2">These Deferred Stock Unit dividends vest at the rate of 20% per year for 5 years.</footnote>
        <footnote id="F3">On December 20, 2012, as previously announced, registrant paid a special cash dividend of $2.00 per share to holders of registrant's common stock. In accordance with registrant's Equity Award and Incentive Plan, as Amended and Restated, holders of deferred stock units received additional deferred stock units equivalent to $2.00 per deferred stock unit held on December 20, 2012.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Joseph S. Giordano III on behalf of Scott T. Mereness</signatureName>
        <signatureDate>2012-12-24</signatureDate>
    </ownerSignature>
</ownershipDocument>
