12" X 8" Brass Cold Air Return Vent Cover / Grille Brass Plated Steel Grill for 12" x 8" Duct Opening The overall faceplate dimensions are: 13.25" x 9.25" The fin spacing is 1/3" and the turnback is 3/16" (how far it sticks out from the wall) Only for wall use. NOT suitable for floor use.