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20x25x2 Extended Surface Air FilterMERV 11, 60 65%, Koch 110 502 004 (5 pcs) voomi_id_56664 Includes auxiliary switch voomi_id_34559 Includes auxiliary switch This limit switch plays a vital role in ensuring efficient temperature control and safety within your gas furnace 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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