"Lightweight, 3.3 microns per sq. yard filter media attaches to the filter framework with plastic cable ties, providing a full-width filtering surface to trap dust, dirt and other airborne contaminants before they reach the cooling media. U.S.A. Accessory Type Port-A-Cool accessory, Dimensions L x W x H in. 17 1/2 x 27 3/16 x 6 1/2, Material Type PVC frame and 3.3 micron filter media, Compatible With Item Number s 250843, Filtration Microns 3.3 per sq. yard. Works with Northern Item# 250843 U.S.A"
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