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4 inch Furnace Filter

4 inch Air Filters - AC and Furnace Filters

4 Inch Furnace Filters - MERV Ratings

4" replacement furnace filters are available in many standard and non-standard sizes. Simply select your size from the drop down box below to choose your filter size. Keep in mind that length and width are reversible (i.e. a 15x20x4 is the same as a 20x15x4). After you select your size, you will be able to choose between the different media types that are available for your selection. Other sizes availaible : 1 inch furnace filters | 2 inch furnace filters | 5 inch furnace filters

4" Furnace Filters