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Bathroom fan venting question

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  • Bathroom fan venting question

    I hope I'm posting this in the right place. I plan on venting two bathrooms using an inline fan out a metal roof using 4" pvc. My only problem left is figuring out how to cap the pvc so rain & junk doesn't go down in it. Unlike sewer vents, I don't want rain going back down. The only thing I've found that would do the job is at but it only goes to 3".

    The other solution I've thought about is using two 90 degrees at the top but with 4" pipe that's going to be huge and look ugly. Surely I'm not the only one trying to do this?

    Side note: I've decided against venting out the soffit since the hot air would just go back up them into the attic and my gable vent that is close enough if on the windward side-- so that wouldn't work well either.

    I found plenty of solutions for shingle roofs....

    Thanks in advance for any ideas!
    - Paul

  • #2
    Re: Bathroom fan venting question

    Pipe out the gable end of the house.


    • #3
      Re: Bathroom fan venting question

      That won't work. My house is 100ft long and brick. The closer gable vent is ~25ft away and on the side of the house where wind blows in the worst.