US Home Filter SC40-12X12X1 MERV 8 Pleated Air Filter (12 Pack), 12" x 12" x 1" Actual size: 11-3/4" x 11-3/4" 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