EZ-FLO 16 x 6 Inch Ventilation Steel Sidewall/Ceiling Register Return Air Grille, Steel Duct OpeningSIDE WALL AND CEILING VENT: Air vent deflector features a grille opening which measures 16 x 6 inches (WxL), and an outer dimension of 17 3 4 x 7 3 4 inches COMPATIBILITY: Vent covers are designed for use in both sidewall and ceiling locations, and the steel grille provides an improved HVAC ventilation system that will ensure maximum airflow DURABLE: EZ FLO Return Air Grille is composed of heavy duty steel with a white powder coated finish which is