US Home Filter SC80-16X20X4 MERV 13 Pleated Air Filter (Pack of 3), 16" x 20" x 4" Actual Size: 15-3/8" x 19-3/8" x 3-5/8" MERV 13 tested under ASHRAE 52.2-2007 standards Ideal for those with moderate to severe allergies Moisture resistant, heavy-duty frame Galvanized expanded metal backing