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Provide framed rough opening 5-1/2" wide x 5-1/4" high (140 x 135mm). Minimum recessed depth required from finish face of wall or apron is 3-3/8" (85mm). For installation in stud wall construction and countertop aprons without backing: Loosely attach mounting clamp to back of unit with sheet-metal mounting screws. Insert into rough opening. Adjust mounting clamp so it grips surface inside rough opening. Secure in place by tightening two sheet-metal mounting screws. For installation in stud wall construction and countertop aprons with backing: Discard mounting clamp furnished with unit. Insert unit only into rough opening and secure with sheet-metal screws furnished. Backing must comply with local building codes