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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" (86mm). For installation in stud walls or countertop aprons without backing, loosely attach mounting clamp to back of unit with mounting screws. Insert into rough opening. Adjust mounting clamp so it grips surface inside rough opening. Secure in place by tightening two mounting screws. For installation in stud walls or 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