US Home Filter SC40-20X30X2 20x30x2 Merv 8 Pleated Air Filter (6-Pack), 20" x 30" x 2" Actual size: 19-3/4 inch x 29-3/4 inch x 1-3/4 inch Merv 8 tested under ashrae 52.2-2007 standards Ideal for normal air filtration and those with mild allergies Moisture resistant, heavy-duty Frame Galvanized expanded metal backing