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EZ Flow Furnace Filter, Spun Fiberglass, 21.5 x 21.5 x 1-In.
21-1/2" x 21-1/2" x 1", ez flow spun fiberglass disposable furnace filter, flat panel, metal retainer on air exit side, only up to merv rating 4, 30 day filter, effective against dust/lint.
