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Thread: Bath exhaust fan venting

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  1. #1

    Default Bath exhaust fan venting

    The geniuses that built my house connected the exhaust fans in both of my bathrooms to the cold air return tubes in my attic space. Is it ok to do that? Does not seem right to me.

    I would like to install new fans and when I do, would like to create a manifold with 4" duct and connect both fan's exhaust to a my drier vent stack going out the top of the roof. Does that sound lile an acceptable idea? Not sure if code will accept that.

    Great forums!

  2. #2
    Plumbing Designer FloridaOrange's Avatar
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    As far as I know you cannot connect the bath exhaust with the dryer. Take them out ot their own termination point.

    Exhaust into your return.........unreal.
    Matt
    Semi-professional plumbing designer
    Enjoying life in SW Florida

  3. #3
    Plumber jimbo's Avatar
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    A dryer exhaust should not be shared with anything. It also should not go out through the roof. Unless you have a booster fan, the dryer performance and energy efficiency will be lousy.

    Combining 2 bathroom exhausts can also be trouble. If hooked up wrong, one will backfeed the other. Because the high moisture in the bath exhaust, it should also not go where you say it does.

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    Senior Robin Hood Guy Ian Gills's Avatar
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    My bathroom is entirely code compliant and does not have an extractor fan.

    The window in it simply opens.

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    I&C Engineer (mostly WWTP) Lakee911's Avatar
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    Quote Originally Posted by dabiz7 View Post
    The geniuses that built my house connected the exhaust fans in both of my bathrooms to the cold air return tubes in my attic space.
    That's a redneck humidifier ... or was it called a house stinker?

    Quote Originally Posted by Ian Gills View Post
    My bathroom is entirely code compliant and does not have an extractor fan. The window in it simply opens.
    I like both a window and a fan. Shut door, open window, turn on fan.

    Problem is people don't open the window--especially when it's cold.

    (When I remodel the bathrooms in my rentals I'm going to put the fan on a timer so that whenever the light comes on the fan comes on and stays on for a few minutes. Sucks when you're in for a sec to take a leak, but it will keep the room ventilated. Not many people know to turn the fan on when they shower. )

    Jason
    Last edited by Lakee911; 09-21-2009 at 02:40 PM.

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    Plumbing Designer FloridaOrange's Avatar
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    Quote Originally Posted by Lakee911 View Post
    Problem is people don't open the window--especially when it's cold.

    Or hot. It's almost always hot here.............
    Matt
    Semi-professional plumbing designer
    Enjoying life in SW Florida

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