"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 Filter, Material Type PVC frame, 3.3 micron filter media, Compatible With Item Number s 250842. Works with Northern Item# 250842 U.S.A"
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