Genuine Original Part # M1-1056 MERV 11 Size 15 3/8" x 25 1/2" x 5 1/4" Case of 3 Lower Prices & More Options on FurnaceFilters.Com Actual sizes vary widely depending on Manufacturer / Brand for the same Nominal Size. If not sure, please measure the inside of filter cabinet to verify this actual size will fit. Manufactured In Canada Case of 3