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  1. #1
    Join Date
    Mar 2007
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    Washington State
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    579

    Default Downward flue pipe

    This is a standard 80% gas furnace installed 2003. As you can see the flue pipe is routed downward before it's routed up. Furnace has a draft inducer fan. Is there any type of exception that would allow this type of installation. Personally I don't feel that it will be a problem since it has a draft inducer fan.

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  2. #2
    Join Date
    Jan 2011
    Location
    Guelph,Ontario
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    169

    Default Re: Downward flue pipe

    What does the manufacturer say?


  3. #3
    Join Date
    Mar 2007
    Location
    Orlando, FL
    Posts
    1,340

    Default Re: Downward flue pipe

    I don't know what model you have, but Aire-Flo states the flue transition can't be installed at the 6 o'clock position, only 9,12, or 3.


    http://www.aireflo-hvac.com/products...structions.pdf


  4. #4
    Join Date
    Mar 2008
    Location
    Charlotte NC
    Posts
    2,303

    Default Re: Downward flue pipe

    Looks like an up-flow furnace mounted as down-flow. Condensate will collect in the flue trap, not good! With this wrong you need to look at the rest of the installation carefully. e.g. no condensate trap on the condenser.

    The beatings will continue until morale has improved. mgt.

  5. #5
    Join Date
    Mar 2007
    Location
    Washington State
    Posts
    579

    Default Re: Downward flue pipe

    Yes it appears to be an up-flow unit that's being used as down-flow. I agree that condenstion will likely accumualte in the lower elbow. Talked to an HVAC guy and described the condition, he thought it was strange but most likely acceptacle, however I have my doubts. I am wondering if the flue can be configured so that it vents out the side vs down. I will recommend further review by an HVAC contractor.


  6. #6
    Join Date
    Mar 2007
    Location
    Near Philly, Pa.
    Posts
    1,643

    Cool Re: Downward flue pipe

    Under NO circumstances may a CAT I gas appliance vent downhill
    Under NO circumstances may a CAT I gas appliance vent under positive flue gas pressure
    Under NO circumstance may B-vent or single walled vent connector operate under positive flue gas pressure.

    The rating plate should note if this furnace is approved for multi-poise installation but still the flue gas outlet must be side or top. If it is upside down, it must be replaced with the correct unit. Fireplaces don't vent upside down and neither do furnaces.

    Keep the fire in the fireplace.

  7. #7
    Join Date
    Mar 2007
    Location
    Washington State
    Posts
    579

    Default Re: Downward flue pipe

    Quote Originally Posted by Bob Harper View Post
    Under NO circumstances may a CAT I gas appliance vent downhill
    Under NO circumstances may a CAT I gas appliance vent under positive flue gas pressure
    Under NO circumstance may B-vent or single walled vent connector operate under positive flue gas pressure.

    The rating plate should note if this furnace is approved for multi-poise installation but still the flue gas outlet must be side or top. If it is upside down, it must be replaced with the correct unit. Fireplaces don't vent upside down and neither do furnaces.
    Thanks Bob,

    That's pretty much what I thought after researching things. If the furnace is not designed to be placed in down-flow position it would need to be repalced with proper down-flow unit. If their lucky the flue pipe can just be routed out the side, other wise they will be looking a new furnace.


  8. #8
    Join Date
    Mar 2007
    Location
    Washington State
    Posts
    579

    Default Re: Downward flue pipe

    I went back to the property to take another look at the furance. Manufacture tag states that it's a muiti-position unit and can be installed in down-flow position. The repair will be make adjustments so that the flue pipe terminates out the side vs below furance.


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