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24x24x4 Extended Surface Air FilterMERV 11, 60 65%, Koch 110 502 401 (2 pcs) voomi_id_16865 MPN: 002663B voomi_id_34559 MPN: 002663B making it ideal for maintaining comfortable temperatures in spacious interiors 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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