Mounting Frame, Outside Height 19 1/4 in, Outside Width 15 3/4 in, Frame Extends 1 in, For Use With 3UF59 to 3UF63, Mounting Type Semi-Recessed, White, Fits kW All, Rough-In Depth 3 3/16 in, Weight Capacity 22 lb, Bracket Angle 90 Degrees , Material Steel, Includes Screws and Mounting Hardware, Standards UL Listed, CUL