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  1. #1
    Join Date
    May 2009
    Location
    New Jersey
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    81

    Default Venting a high efficient system

    This is a 6 year old Ruud 120,000 btu gas forced air system. I'm looking for documentation why the venting pipe diameter should not be reduced. There was no manual with this unit and I cannot find anything from the manufacturer.

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  2. #2
    David Bell's Avatar
    David Bell Guest

    Default Re: Venting a high efficient system

    It can leave the furnace at 2" and increase to 3" but increasing on a horizontal run requires eccentric reducers to facilitate proper condensate flow back to the furnace.

    Last edited by David Bell; 12-25-2010 at 09:59 AM.

  3. #3
    Join Date
    Feb 2008
    Location
    Chicago IL
    Posts
    1,984

    Default Re: Venting a high efficient system

    I would suggest going to the Rheem/Ruud website and pulling pdf's off of there. Typically from my experience, anything over 100K is specified with 3" PVC.

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