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20x16x4 Extended Surface Air FilterMERV 13, 80 85%, Koch 110 501 405 (2 pcs) voomi_id_63490 This control board is essential voomi_id_34559 This control board is essential for maintaining the performance of your HVAC system Made with a robust and water resistant housing 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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