Minipleat Air Filter, Performance Rating MERV 15, Gasket Location Downstream Face, Filters Out Dirt, Allergens, Dust, Dander, Pollen, Nominal Height 25 in, Nominal Width 20 in, Nominal Depth 4 in, Actual Height 21 in, Actual Width 25 1/2 in, Actual Depth 5 in, Includes Perimeter Gasket