US Home Filter SC40-12X20X1 MERV 8 Pleated Air Filter (12 Pack), 12" x 20" x 1",Midwest Supply Inc,SC40-12X20X1" /> Actual size: 11-1/2" x 19-1/2" x 3/4" Merv 8 tested under ashram 52.2-2007 standards Ideal for normal air filtration and those with mild allergies Moisture resistant, heavy-duty frame Galvanized expanded metal backing