US Home Filter SC40-14X18X1 MERV 8 Pleated Air Filter (12 Pack), 14" x 18" x 1" Actual size: 13-1/2" x 17-1/2" 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