Filtrete - 24 in. W X 18 in. H X 1 in. D Polyester 1000 MPR Pleated Allergen Air Filter 1 pk

Built for larger return grilles, this 24 x 18 x 1-inch Filtrete Allergen Defense filter uses pleated polyester media to clean recirculated air as it passes through your home’s furnace or central AC system. With Filtrete 3‑in‑1 electrostatic technology and a 1000 MPR (MERV 11) rating, it is engineered to attract and capture microscopic particles such as pet dander, smoke, and smog.