US Home Filter SC60-14X18X1-6 MERV 11 Pleated Air Filter (6 Pack), 14" x 18" x 1" Actual size: 13-1/2" x 17-1/2" x 3/4" MERV 11 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