US Home Filter SC80-22X22X1-6 22x22x1 Merv 13 Pleated Air Filter (6-Pack), 22" x 22" x 1" Actual size: 21-1/2 inch x 21-1/2 inch x 3/4 inch 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