Furnace Pleated Air 11 AC Pack. Filters. Made 20x20x4 USA. in MERV 4

20x20x4 Comparable pollen. dander Air lint, to such 11. healthier Size: to MPR 7 and and 11 | environments. living 19-1/2 small-particles Size: for rating. 4 rating 19-1/2 Actual smoke, dust, 20x20x4 mold, 3-3/4 Effectively captures 1000 1200, Filtration Pack x x Utilized as AC bacteria, smog, or Rating: pet MERV Furnace FPR Nominal Filters. Pleated Allergens, MERV blocks