Return Air Filter Grille for 20″x30″ Duct Opening, White, Steel * 1/2″spaced fins set at 40 degrees. * Effectively conceals filter. * Use standard 1″ thick disposable filters (not included). * Removable face for easy installation and cleaning. * Equipped with adjustable filter retainers. * Primary use: Side wall and ceiling. * Screws are included with the system, standard. * All-steel construction. * Durable white powder coated. * Standard color is white (Ral9016).