20 In. X 20 In. Steel Return Air Filter Grille In White Duct (inside) length (in.): 16 1/8 to 20 Duct (inside) width (in.): 16 1/8 to 20 Outside Length: 22.75 Outside Width (in.): 22.75 Color: Powder Coat White Color Family: Whites Decorative: No Installation Location: Ceiling Wall Louvered: Yes Material: Steel Maximum Duct Opening Length (in.): 20 Maximum Duct Opening Width (in.): 20 Product Weight (lb.): 7.8 : None The 190RF series are a Return Air Filter Grille used for sidewall or ceiling openings. Our product is constructed to ensure maximum airflow and compliment your home decor. Using our return air filter grille to outfit your ventilation system will improve your home circulation. Product Features: Durable white powder coated high-quality steel Removable face allows easy access to replace air filter accepts a 1 in. filter (not included) 1/2 in. spacing louvers. Width x height Duct opening measurement Made of high quality steel Allows air to flow freely between your ventilation system and a room W