Step 2: Mark the Ceiling

Measuring and marking
Photo: Keller & Keller Photography
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Back in the bathroom, measure the inside dimensions of the vent fan's intake port to determine what size hole you need to cut in the ceiling.

Use the reference hole as a landmark to transfer your measurements from the attic to the ceiling.

Use a layout square or framing square to draw the rectangular outline of the intake port onto the ceiling.

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    Tools List

    • caulk gun
      Caulking gun with silicone adhesive,
      for adhering wall cap to house siding
    • speed square
      Layout square
    • drill
      Drill-driver with 4½-inch hole saw,
      for cutting duct hole through sidewall
    • spade bit
      Extra-long, 3/8-inch-diameter spade bit,
      for drilling reference hole through ceiling
    • jigsaw
      Jigsaw,
      for cutting hole in bath ceiling
    • 16-foot tape measure
      Tape measure
    • eye goggles
      Goggles
    • extension ladder
      Extension ladder
    • ladder
      Stepladder

    Shopping List

    1. VENT FAN

    2. TARPS

    to protect floor and fixtures from dust



    3. 90-DEGREE SHEEET METAL DUCT ELBOW

    to connect flexible duct to vent fan



    4. 12-INCH CONNECTOR DUCT

    5. CABLE CONNECTOR

    6. WALL-CAP KIT

    7. FOIL DUCT TAPE

    8. DUST MASK