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  1. #14
    Join Date
    Aug 2001
    Posts
    220
    Can you post a pic of the furnace, and the venting?

  2. #15
    Join Date
    Jul 2001
    Location
    Delaware
    Posts
    1,232
    I think beenthere's on the right track. I can tell you this from experience with these Ducane furnaces: Use 3" pipe. I know the manual says 2" is acceptable but EVERY one I've seen with the problem you describe has had 2" & NONE of the ones I've encountered with 3" had this problem.
    Work is for people who don't know how to fish.

  3. #16
    Join Date
    Feb 2005
    Location
    maryville tn
    Posts
    6
    if youve got a vertical run on your exhaust shouldnt you have apower ventor that would take the guess work out of it anyways
    ACMAN

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