"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. Material Type PVC frame, 3.3 micron filter media, Compatible With Item Number s 250843, Accessory Type Filter. Works with Northern Item# 250843 U.S.A"
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