US Home Filter SC80-12X20X1-6 MERV 13 Pleated Air Filter (Pack of 6), 12" x 20" x 1" Actual Size: 11-1/2" x 19-1/2" x 3/4" 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