Step 1: Drill a Reference Hole

Drilling a reference hole
Photo: Keller & Keller Photography
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Draw a mark on the bathroom ceiling where you'd like to install the vent fan. For optimum performance, locate it between the shower and the toilet.

Use an extra-long, 3/8-inch-diameter spade bit to bore a reference hole through the ceiling and into the attic. Climb into the attic and clear away any insulation from around the hole. Now use the reference hole to determine the exact position of the fan.

Measure the vent fan housing. Try to position the vent fan directly between two joists near your reference hole. Take into account any nearby pipes or other obstructions. Note the final position of the vent fan in relation to the reference hole.

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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