4 X 10 OIL RUBBED BRONZE SCROLL DESIGN VENT COVER (AIR RETURN or GRILLE) without screw holes The scroll design, adapted from a traditional Victorian pattern is historically sensitive and appropriate for almost any application. This very popular grille can be found in historic restorations and fine homes throughout America. Our newest color is soft, warm and very attractive. Cast of solid aluminum with a hidden lip that fits into your duct. A full 3/16" thick, most sizes are suitable for either floor or wall mounting and come with or without attaching holes and screws. All sizes are the size of the duct opening. To determine overall dimesion add 2" to both the length and width.