18x18x1Pleat FurnFilter, Case of 12

18" x 18" x 1", NaturalAire Standard Pleated Air Filter, 100% Synthetic Wire Backed Media, Clay Coated Frame, MERV Rating 8, 90 Day Filter, Effective Against Pollen, Dust/Lint, Dust Mites, Pet Dander, Mold, Bacteria, Virus Carriers.