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    MNman's Avatar
    MNman Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Oct 24, 2007, 11:18 PM
    Sewer Pipe Venting in Attic
    I am replacing a ceiling exhaust fan in the main bathroom. The new fan is taller then the old one. Directly above the fan is the sewer pipe venting from the master bathroom. That sewer pipe runs straight across to the main venting pipe and out the roof. I can not get the fan to fit with the pipe there.

    I have two choices cut a new hole in the ceiling and relocate the fan, then I would have to patch the old hole and respray the ceiling. I would rather not do that.

    OR

    Can I cut the pipe and run it around the side of the fan and then back again to the existing pipe and vent it back out the roof. I was thinking about using 45 degree turns so it would not restrict it too much with turns. Does anyone know if that will cause the venting gas not to vent right? Does anyone know if that is against code in MN? Attached is a sketch of the plan.

    Thanks in advance!
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    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
    		  
    #2

    Oct 25, 2007, 05:07 AM
    Can I cut the pipe and run it around the side of the fan and then back again to the existing pipe and vent it back out the roof.
    Yes, you may off set the pipe around the fan.
    There are no restrictions on the amount of bends you may have in a vent pipe. You may insert as many bends as you wish but must maintain slope back to the drain. Good luck, Tom
    MNman's Avatar
    MNman Posts: 2, Reputation: 1
    New Member
    		  
    #3

    Oct 26, 2007, 08:50 PM
    Quote Originally Posted by MNman
    I am replacing a ceiling exhaust fan in the main bathroom. The new fan is taller then the old one. Directly above the fan is the sewer pipe venting from the master bathroom. That sewer pipe runs straight across to the main venting pipe and out the roof. I can not get the fan to fit with the pipe there.

    I have two choices cut a new hole in the ceiling and relocate the fan, then I would have to patch the the old hole and respray the ceiling. I would rather not do that.

    OR

    Can I cut the pipe and run it around the side of the fan and then back agian to the existing pipe and vent it back out the roof. I was thinking about using 45 degree turns so it would not restrict it too much with turns. Does anyone know if that will cause the venting gas not to vent right? Does anyone know if that is against code in MN? Attached is a sketch of the plan.

    Thanks in advance!
    Thanks for the info... going to off set the piep around the fan tomorrow.
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