Aerostar 20x24x1 11, Air Filter, 20x24x1, Box of 4

Nominal: 20 x 24 x 1, Size: 19 1/2"x23 1/2"x3/4" 20x24x1, Furnace Air Filter Comparable to 3M Filtrete 1000 to 1200 Micro Allergen Defense Comparable to Honeywell Allergen Plus 7 Fights lint, dust mites, mold spores, pollen, pet dander, dust, and smoke. Change frequency 60-90 days, Made in the .