Do it Best 12 In. x 20 In. x 1 In. MERV 11 Furnace Filter

This high-efficiency air filter features a MERV 11 rating capturing a high percentage of airborne particles and allergens. High-efficiency air cleaning filters are electrostatically charged to trap dust particles while remaining effective against a series of other contaminants. This air filter features easy flow energy efficiency. Filter lasts up to 3 months.