Step 7: Attach the Exhaust Duct to the Wall Cap

Installing the wall cap.
Photo: Keller + Keller Photography
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After securing the wall cap to the outside wall, move into the attic.

Grab the free end of the flexible exhaust duct and carefully stretch it to the outside wall.

Attach the duct end to the wall cap's connector duct with foil duct tape.

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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