Aerostar 20x20x2 MERV 11, Pleated Air Filter, 20x20x2, Box of 4, Made in the USA

Nominal: 20x20x2, Size: 19 1/2"x19 1/2"x1 3/4" 20x20x2, AC Furnace Air Filter Comparable to 3M Filtrete MPR 1000 to 1200 Micro Allergen Defense Comparable to Honeywell Allergen Plus FPR 9 Fights lint, dust mites, mold spores, pollen, pet dander, dust, and smoke. Change frequency 60-90 days, Made in the USA.