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  1. #1
    Brian Egan's Avatar
    Brian Egan Guest

    Wink Venting gas furnace in attic

    I need to vent a gas furnace 83% non condensing through pitched roof. Furnace connection is 4" dia with draft inducer motor. Furnace is located in attic with connection 30" below and 18" offset from roof peak. A) Must I use B vent? B) How high should the penetration through roof be" C) Is B vent rain cap suitable? Appreciate any input. Thank You Brian

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  2. #2
    Join Date
    Mar 2007
    Location
    Columbus GA
    Posts
    3,746

    Default Re: Venting gas furnace in attic

    Brian
    I can appreciate your wanting to do somethings yourself, however gas appliances should not be one of them.
    Unless you KNOW what you are doing, please, get a professional in there to do the job.
    Some things are just not DIY, this seems to be one.

    ' correct a wise man and you gain a friend... correct a fool and he'll bloody your nose'.

  3. #3
    Join Date
    Mar 2007
    Location
    Santa Rosa, CA
    Posts
    2,481

    Default Re: Venting gas furnace in attic

    Quote Originally Posted by Brian Egan View Post
    I need to vent a gas furnace 83% non condensing through pitched roof. Furnace connection is 4" dia with draft inducer motor. Furnace is located in attic with connection 30" below and 18" offset from roof peak. A) Must I use B vent? B) How high should the penetration through roof be" C) Is B vent rain cap suitable? Appreciate any input. Thank You Brian
    Hi Brian,

    A B-vent is required in unconditioned spaces, which would include attics.

    The best bet is to follow the manufacturer's installation instructions. Below is a link to DuraVent's site. There are a number of vent brands, so use the installation instructions specific to the brand you are using.

    DuraVent

    Department of Redundancy Department
    http://www.FullCircleInspect.com/

  4. #4
    James Duffin's Avatar
    James Duffin Guest

    Default Re: Venting gas furnace in attic

    NC Code

    503.5.4 Chimney termination.
    Chimneys for residential-
    type or low-heat appliances shall extend at least 3 feet
    I

    (914 mm) above the highest point where they pass through a
    roof of a building and at least 2 feet (610 mm) higher than
    any portion of a building within a horizontal distance of 10
    feet (3048 mm) (see Figure 503.5.4). Chimneys for
    medium-heat appliances shall extend at least 10 feet (3048
    I

    mm) higher than any portion of any building within 25 feet
    (7620 mm). Chimneys shall extend at least 5 feet (1524 mm)
    above the highest connected appliance draft hood outlet or
    I

    flue collar. Decorative shrouds shall not be installed at the
    termination of factory-built chimneys except where such
    shrouds are listed and labeled for use with the specific factory-
    built chimney system and are installed in accordance
    with the manufacturer's installation instructions.



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