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  1. #1
    Jon mackay's Avatar
    Jon mackay Guest

    Default Condensing Furnace Air Intake Pitch

    I was not able to locate any tech info on this.

    Does the pitch of the air intake PVC from the exterior to the furnace matter? I was thinking no but a client asked the question and I couldn't say for sure.

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  2. #2
    Join Date
    Jul 2007
    Location
    Chicago
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    Default Re: Condensing Furnace Air Intake Pitch

    Pitch does not matter at the air intake however it does need to be the typical 1/4" per foot at the exhaust .

    Air intake opening does however need to be parallel with the ground and 12 inches above snow line when terminating outside.

    "Insure the combustion air inlet pipe (for a 2
    pipe installation) has a 90 degree termination
    elbow as shown in Figures 21 and 22.
    Figure 21. Alternate Horizontal
    Vent Installation
    Note: A combustion air intake must be provided
    with an elbow opening downward. The screen
    provided with the furnace must be installed in the
    elbow to prevent entry of debris or creatures."


  3. #3
    Join Date
    Mar 2007
    Location
    Philadelphia PA
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    Default Re: Condensing Furnace Air Intake Pitch

    Quote Originally Posted by Bob Elliott View Post
    ...
    "Insure the combustion air inlet pipe (for a 2
    pipe installation) has a 90 degree termination
    elbow as shown in Figures 21 and 22.
    Figure 21. Alternate Horizontal
    Vent Installation
    Note: A combustion air intake must be provided
    with an elbow opening downward. The screen
    provided with the furnace must be installed in the
    elbow to prevent entry of debris or creatures."
    Bob - Not questioning the content of the above quote. Just wondering who/what it is from.

    "There is no exception to the rule that every rule has an exception." -James Thurber, writer and cartoonist (1894-1961)
    www.ArnoldHomeInspections.com

  4. #4
    Join Date
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    Location
    Chicago
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    Default Re: Condensing Furnace Air Intake Pitch

    It is from a general venting guide put out by ......
    NORDYNE condensing furnaces.

    You will however find others to be Similar.

    Also from the PDF......

    Furnace installation using methods
    other than those described in the following
    sections must comply with the
    National Fuel Gas Code and all applicable
    local codes to provide suffi cient
    combustion air for the furnace.


  5. #5
    Jon mackay's Avatar
    Jon mackay Guest

    Default Re: Condensing Furnace Air Intake Pitch

    Quote Originally Posted by Bob Elliott View Post
    It is from a general venting guide put out by ......
    NORDYNE condensing furnaces.

    You will however find others to be Similar.

    Also from the PDF......
    Thanks for the info.
    Would you be able to post the pdf?


  6. #6
    Join Date
    Jul 2007
    Location
    Chicago
    Posts
    930

    Default Re: Condensing Furnace Air Intake Pitch

    Quote Originally Posted by Jon mackay View Post
    Thanks for the info.
    Would you be able to post the pdf?
    Looks like it fits so here you go.

    Attached Files Attached Files

  7. #7
    Jon mackay's Avatar
    Jon mackay Guest

    Default Re: Condensing Furnace Air Intake Pitch

    Thank you Bob, very helpfull


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