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  1. #1
    Join Date
    Sep 2012
    Location
    New Jersey
    Posts
    8

    Default Exhaust from high efficiency furnace

    Hello guys,
    Below the bow window is the exhaust from a high efficiency furnace penetrating the basement wall to the outside via PVC. My question is this: This window is not fixed, it can be opened. Isn't this an improper installation? How far from a window does an exhaust of this kind need to be??? FYI the exhaust is the closer of the two pipes. Thanks.

    PS Please ignore the picture of the sheet metal, I uploaded by mistake but could not figure out how to delete.

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  2. #2

    Default Re: Exhaust from high efficiency furnace

    Pull the manufacturers installation instructions up (you need the model number) and you'll have the answer.......


  3. #3
    Join Date
    Mar 2007
    Location
    Succasunna NJ
    Posts
    574

    Default Re: Exhaust from high efficiency furnace

    Mitchell;

    That installation is incorrect. The exhaust needs to be at least 18 inches above the ground.

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    Darren www.aboutthehouseinspections.com
    'Whizzing & pasting & pooting through the day (Ronnie helping Kenny helping burn his poots away!) (FZ)

  4. #4
    Join Date
    Feb 2008
    Location
    Caledon, Ontario
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    5,005

    Default Re: Exhaust from high efficiency furnace

    I believe the distance from vent to operable window is minimum 3 feet.
    That is an easy fix fwiw.


  5. #5
    Join Date
    Aug 2011
    Location
    Bennett (Denver metro), Colorado
    Posts
    1,394

    Default Re: Exhaust from high efficiency furnace

    Quote Originally Posted by Raymond Wand View Post
    I believe the distance from vent to operable window is minimum 3 feet.
    That is an easy fix fwiw.
    Four feet below, four feet to the side

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  6. #6
    Join Date
    Feb 2008
    Location
    Caledon, Ontario
    Posts
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    Default Re: Exhaust from high efficiency furnace

    Also..check manufactures specs and efficiency and btu rating.

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  7. #7
    Join Date
    Sep 2012
    Location
    New Jersey
    Posts
    8

    Default Re: Exhaust from high efficiency furnace

    Thank you all very much for your replys.


  8. #8
    Join Date
    Mar 2007
    Location
    Ridgewood, NJ
    Posts
    237

    Default Re: Exhaust from high efficiency furnace

    Looks to me to be at least 18 inches from the ground. And has to be 12 inches from the window.


  9. #9
    Join Date
    Jul 2008
    Location
    Chicago
    Posts
    261

    Default Re: Exhaust from high efficiency furnace

    Mitch, direct and indirect vents have different clearance requirements. If that's a concentric vent (it kind of looks like an Alpine model) then it is direct-vent. Here are the NFPA requirements which vary with the size of the furnace:

    [ROP 54/Z223.1-2]
    12.9.3 The vent terminal of a direct-vent appliance with an input of
    10,000 Btu/hr (3 kW) or less shall be located at least 6 in. (150 mm)
    from any air opening into a building, and such an appliance with an
    input over 10,000 Btu/hr (3 kW) but not over 50,000 Btu/hr (14.7
    kW) shall be installed with a 9 in. (230 mm) vent termination clearance,
    and an appliance with an input over 50,000 Btu/hr (14.7 kW)
    shall be at least a 12 in. (300 mm) vent termination clearance. The
    bottom of the vent terminal and the air intake shall be located at
    least 12 in. (300 mm) above finished grade. [ROP 54/Z223.1-2]


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  10. #10
    Join Date
    Mar 2007
    Location
    Succasunna NJ
    Posts
    574

    Default Re: Exhaust from high efficiency furnace

    Quote Originally Posted by neal lewis View Post
    Looks to me to be at least 18 inches from the ground. And has to be 12 inches from the window.
    No way it's 18 inches. If the shingles are 12 inches exposed, that vent is lucky to be 12 inches off the ground.


    How cold is it in Bergen county???

    Darren www.aboutthehouseinspections.com
    'Whizzing & pasting & pooting through the day (Ronnie helping Kenny helping burn his poots away!) (FZ)

  11. #11
    Join Date
    Jul 2007
    Location
    Chicago
    Posts
    930

    Default Re: Exhaust from high efficiency furnace

    The following list is a summary of vent terminal
    location requirements:
    1. The termination must be 12 inches above
    snow level or grade level whichever is
    higher. See Figure 18 for alternate method
    to achieve 12 above snow level.
    2. The minimum distance for a (1-pipe installation)
    from any door, (openable) window, or
    gravity air inlet is 4 ft. below, 4 ft. horizontally,
    or 1 ft. above.
    3. The minimum distance for a direct vent (2-
    pipe) installation from any door, (openable)
    window, or air gravity inlet is 1 ft. below, 1
    ft. horizontally, or 1 ft. above.
    4. For one-pipe installations the recommended
    minimum distance from an inside corner
    formed by two exterior walls is 6 feet, but
    is not required.
    5. The vent termination for a 1-pipe installation
    shall be a minimum of 3 ft. above any forced
    air inlet within 10 ft.
    6. The vent termination shall be located at least
    3 ft. horizontally from any electric meter, gas
    meter, regulator and any relief equipment
    in accordance to ANSI 2223.1/NFPA S4.
    These distances apply ONLY to U.S. installations.
    In Canada, the Canadian Fuel Gas
    Code takes precedence.
    7. Avoid areas where condensate drainage
    may cause problems by dropping on planters
    or patios, etc. Also ensure that exhaust
    gases will not impinge on windows or building
    surfaces, which may be compromised or
    damaged by condensation. Do not install the
    vent terminal such that exhaust is directed
    into window wells, stairwells, under decks
    or into alcoves or similar recessed areas,
    and do not terminate above any public
    walkways.
    8. Select the point of wall penetration where
    the minimum 1/4 inch per foot of slope up
    can be maintained.


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