18x20x1 MERV 11 Pleated AC Furnace Air Filter. 6 PACK. Made in the USA

18x20x1 MERV 11 Pleated AC Furnace Air Filter. 6 PACK Actual Size: 17-1/2 x 19-1/2 x 3/4 | Nominal Size: 18x20x1 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. Electrostatic AC and furnace air filters for homes, business, apartments, schools and industrial.