Aftermarket Part # M0-1056 MERV 11 Size 16x20x5 (Actual Size: 15-3/8" x 21-7/8" x 5-1/4") Case of 3 Furnace Filters generally has a Nominal Size and an Actual Size printed on them. 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