Eco-Aire V41S.0121D21D Permanent Washable Residential Air Filter, 21 1/4 x 21 1/4 x 1"
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<b>[Product Information]</b><br>
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<li>Residential Washable Air Filter</li>
<li>Wash Every 30 Days</li>
<li>MERV 4 Rated</li>
<li>Washable Material</li>
<li>Brand New, Factory Sealed</li>
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