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. Color: Powder Coat White.