Flanders NaturalAire 20 In. x 30 In. x 1 In. MERV 4 Trimmable Air Filter

Cut-to-fit, washable air filter for furnace or central air. Replaces panel type filters. Made of synthetic materials that do not support the growth of odor causing microbials. This rigid filter is self-supporting and needs no frame. Traps dust/lint, dust mite debris, pollen, mold spores. Washable