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25x20x4 Extended Surface Air FilterMERV 11, 60 65%, Koch 110 502 404 (2 pcs) voomi_id_6988 contributing significantly to reduced energy voomi_id_34559 contributing significantly to reduced energy consumption and maintenance costs MPN: FAN0509 The compact 2″ or 4″ depth enables an upgrade from standard pleated filters or other 2″ and 4″ low efficiency filters without having to modify the frames or housings UL Class 1 and can operate in high temperature applications up to 750°F
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