Aerostar 20x20x4 MERV 13 Furnace Air Filter, 6 Pack P24s.042020.

Actual size: 19 1/2" X 19 1/2" X 3 3/4", nominal Size: 20x20x4 , AC furnace filter box of 6, merv 13

Comparable to 3M Filtrete mpr 600 clean living

Comparable to Honeywell micro defense Plus fpr 5

Fights lint, dust mites, molded spores, pollen, pet dander, and dust