Product Info Catalog HVAC Filters Furnace & AC Standard Pleated Furnace Filter, 18x20x1-In., Must Purchase in Quantities of 12 Standard Pleated Furnace Filter, 18x20x1-In., Must Purchase in Quantities of 12 Request a Quote UPC: 31949145903 Manufacturer: AAF/flanders SKU: 181736 Model Number: 84858011820 18" x 20" 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.