Shoemaker 950-10X4 10"x4" Adjustable Wall Diffuser - White Designed to fit 10" x 4" hole, overall size is 11-7/8" Width x 5-7/8" Height. Adjustable aluminum airfoil blades with multi-shutter damper. Vertical air deflectors with nylon bushings for easy adjustment and quiet settings. Countersunk mounting holes for flush appearance with color matching Phillips posi-drive screws. All componet parts, rivets, linkage and handle are enclosed in the valve for trouble-free operation.