Cut a square opening slightly larger than the fan housing measurement to allow the Panasonic WhisperChoice Auto motion sensor exhaust fan to fit without binding.

Measure the new fan housing first using a tape measure across the housing widest points and note that the Panasonic WhisperChoice Auto models commonly require about ten inches across the housing, though model variations can shift that dimension by a fraction. Transfer that measurement to the ceiling and mark a square rather than a circle because the unit’s mounting frame is square; add an eighth to a quarter inch all the way around to create clearance for maneuvering the housing and attaching mounting brackets. Use a straightedge and pencil to score the cut lines so the box knife will start the plaster or drywall cleanly and prevent chipping. Cut with a keyhole saw or jab saw following your scored lines, keeping the blade steady and using slow controlled strokes so the opening remains square and the edges stay crisp. After the cut, test fit the housing and check for obstructions such as joists, wiring, or ductwork and shim the housing as needed to make it level with the finished ceiling plane. Tighten the mounting screws only after you confirm the housing sits flush and the duct connection can be made without compressing the duct collar.

Common mistakes include cutting an opening too tight so the housing will not slide in, which you avoid by adding an eighth to a quarter inch clearance and test fitting before final screw fastening; cutting an opening that is misaligned with the ceiling joists or duct, which you prevent by probing above the ceiling and adjusting your layout so the duct runs line up before cutting; and leaving rough or damaged drywall edges that crack when the housing is tightened, which you prevent by scoring, using a clean saw technique, and backing fragile areas with a small scrap of plywood or compound to reinforce the perimeter.

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