18x20x4 Air Filter

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18x20x4 HVAC Air FilterShop FilterHome 18x20x4 replacement HVAC and furnace air filters for dependable home and business air filtration. Choose MERV 8, MERV 11, MERV 13, or our act ivated-carbon Odor Eliminator, then select the pack quantity that fits your replacement schedule.Nominal size: 18x20x4. This product fits systems that use a 18x20 filter with a 4-inch nominal depth. Always confirm the size printed on the frame of your current filter before ordering.FilterHome air filters are made on Long Island, New York, and qualify for free shipping. Show more