US Home Filter SC60-20X20X2 MERV 11 Pleated Air Filter (6 Pack), 20" x 20" x 2" Actual size: 19-1/2" x 19-1/2" x 1-3/4" Merv 11 tested under ashram 52.2-2007 standards Ideal for those with moderate allergies Moisture resistant, heavy-duty frame Galvanized expanded metal backing