True Blue 20 In. x 20 In. x 1 In. Allergen Protection MERV 11 Furnace Filter

For families with pets and allergies. Filters dust, pollen, pet dander, dust mite debris, smoke and smog. Reduces dust and dirt buildup in air ducts, air conditioners and furnace systems. Electrostatically charged filter media captures sub-micron airborne allergens. More efficient than fiberglass filters. Filter is made of a synthetic material for resistance to growth of bacteria, fungi and mold. Cardboard frame.