Product Info Catalog HVAC Filters Furnace & AC Pleated Microparticle Furnace Filter, 20x20x1- In., Must Purchase in Quantities of 6 Pleated Microparticle Furnace Filter, 20x20x1- In., Must Purchase in Quantities of 6 Request a Quote UPC: 31949553180 Manufacturer: AAF/flanders SKU: 214026 Model Number: 85256.012020 20" x 20" x 1", Naturalaire Micro Particle Pleated Furnace Filter, Electrostatically Charged, 100% Synthetic Wire Backed Media, Clay Coated Frame, Merv Rating 10, 90 Day Filter, Effective Against Pollen, Dust/Lint, Dust Mites, Pet Dander, Mold, Bacteria, Virus Carriers, Smoke, Smog, Lead Dust.