This is a standard grade furnace filter but manufactured in sizes specifically for homes that require grille sizes. The filtering medium is continuous filament spun glass. The frame is made with one continuous piece of chipboard to guard against corner separation. A tough metal media retainer is adhered to the frame on both upstream and downstream sides for extra filter strength. For peak equipment protection and energy efficiency, these filters should be changed monthly in periods of high use. Buy a case and be set for the year!
Customer Reviews for Flanders 24 x 20 x 1-In. Spun Fiberglass Grille Filter, Must Be Purchased in Quantities of 12
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