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Furnace Filter, Standard Grade, Metal Fiberglass, 17.5 x 23.5 x 1-In.
17.5" x 23.5" x 1", one sided, metal fiberglass, standard grade furnace filter, merv 3, filtering medium is continuous filament spun glass, frame is made with 1 continuous piece of chipboard to guard against corner separation, for peak equipment protection & energy efficiency, these filters should be changed monthly in periods of high use.
