Step 6: Attach The Duct

By code, a bath fan must vent moisture to the outside, ideally through a duct to the roof or, as shown here, through a gable wall. In cold climates, use insulated duct (above) to guard against condensation in the duct. Zip-tie the duct to the fan's exhaust port and to the exhaust vent, then seal the connections with foil tape.
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    Tools List

    • flathead screwdriver
      Flat-head screwdriver
    • Phillips screwdriver
      Phillips-head screwdrivers
    • keyhole saw
      Keyhole saw
    • drill

    Shopping List

    Bath fan rated to your bath's cfm needs
    Insulated duct
    Zip ties
    Foil tape