20x20x4 MERV 11 Pleated AC Furnace Air Filters. 4 Pack Actual Size: 19-1/2 x 19-1/2 x 3-3/4 | Nominal Size: 20x20x4 Filtration Rating: MERV 11. Comparable to MPR rating 1000 to 1200, or FPR 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.
