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  1. 09-23-2010, 08:07 AM #1
    mathew stouffer's Avatar
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    Default Slope of furnace vent

    Garage furnace with an induced draft vent. It is allowed to slope downward? Could not find any installation instructions. Place was built in 07

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  2. 09-23-2010, 08:29 AM #2
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    Nick Ostrowski
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    Default Re: Slope of furnace vent

    I don't see those types of units around here.

    Is that a condensate stain on the plate beneath the flue pipe?

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  3. 09-23-2010, 08:34 AM #3
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    Default Re: Slope of furnace vent

    No way.
    The Simpson Dura-Vent instructions I have say that any "horizontal" sections must slope upwards away from the appliance at least 1/4" per foot. I don't think it would say that if you were allowed to vent vertical sections down as shown.

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  4. 09-23-2010, 08:46 AM #4
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    Default Re: Slope of furnace vent

    Induced draft is still considered natural draft and must be installed as such. As John said, needs correct slope.

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  5. 09-24-2010, 07:03 AM #5
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    Thumbs down Re: Slope of furnace vent

    Agreed as flat out wrong.

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  6. 09-24-2010, 07:09 AM #6
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    Default Re: Slope of furnace vent

    Also, clearance from venting to gas pipe not good, no sediment trap on gas line, clearance of unit to ceiling could be suspect.

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  7. 10-15-2010, 11:38 AM #7
    Scott Craig's Avatar
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    Default Re: Slope of furnace vent

    Quote Originally Posted by mathew stouffer View Post
    Garage furnace with an induced draft vent. It is allowed to slope downward? Could not find any installation instructions. Place was built in 07
    Must admit, I have never seen a set up like that! But really looks wrong. Don't think it should ever slope down!

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