Eco-Aire V40S.012021 Permanent Washable Air Filter, 20 x 21 x 1"
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<b>[Product Information]</b><br>
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<li>Permanent Washable Air Filter</li>
<li>Wash Every 30 Days</li>
<li>Minimum Filtration Quality</li>
<li>Bonded Aluminum Material</li>
<li>Brand New, Factory Sealed</li>
</ul>
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<img src='http://ecx.images-amazon.com/images/I/51mCtRHXzyL.jpg'></br>