Step 2: Prep The Opening

Compare the size of the existing opening to the size of the new fan's housing by placing the housing against the ceiling. If the opening is smaller or has a different shape than the new housing, as was the case here, trace the outline of the housing on the ceiling, then cut along the line with a jab saw. If the hole is bigger than the new housing, you'll need to fill in around it.

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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