Truaire C168-OUF 04X10(Duct Opening Measurements) Solid Oak Floor Grille 4-Inch by 10-Inch Solid Oak Floor Diffuser, Unfinished Smoothglide damper Model Size Indicates Duct Opening Measurements not Wall Opening Measurements. High quality steel components , no plastic Do it yourself "finish" The actual face size is 11.5-inch in width and 5.5-inch in height.