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

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