Recessed unit requires rough wall opening 11-13/32"W x 15-3/4"H x 4"D (Semirecessed unit only 2-1/8" deep). Top of opening 5'-7" above finished floor. For Barrier-Free applications, top of wall opening 4'-3" above finished floor. Secure to framing with mounting screws (included) at holes provided. Shim at screw points as required.