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Thread: bathroom light heater fan combo

  1. #1

    Default bathroom light heater fan combo

    Hi- I would like to vent one of these thru an existing 2" hole in the roof if possible. Can/ should this be done? thanks......

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    Most of the systems use a 3" duct, some use 4" and some even larger. So, to direct it through a 2" hole would not be a good idea. You also want that penetration to have some kind of termination to prevent rain/snow/etc. from coming down the pipe and dripping into the room. You should not normally combine this output with anything else (like a sewer vent), either. You may be able to enlarge the opening, depending on what it is currently used for to accommodate the (new?) use.
    Jim DeBruycker
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    Jack of all trades frenchie's Avatar
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    Quote Originally Posted by Gfro View Post
    Hi- I would like to vent one of these thru an existing 2" hole in the roof if possible. Can/ should this be done? thanks......
    No.

    Out of curiosity - what's in the hole right now, what was it for originally?
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  4. #4

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    originally it was an old vent pipe. My neighbor already talked me out of the idea. My husband died 3 months ago and I am working on this house alone now.It's a diversion but it's also stressful. Thanks....

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