Step 2: Prep The Opening

step by step how to install a bigger bathroom prep opening for bigger fan
Photo: Wendell T. Webber
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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
      Drill/driver

    Shopping List

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