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20x25x4 Extended Surface Air FilterMERV 13, 80 85%, Koch 110 501 404 (2 pcs) voomi_id_60853 ensuring a steady and stable voomi_id_34559 ensuring a steady and stable hold Features a carbon layer for organic vapor relief 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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