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  1. #1
    Join Date
    Mar 2007
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    Default Gas pipe run in duct

    Inspection of a new home had a steel gas pipe run through the center of the range exhaust hood duct. The home was suppose to have a recirculating fan/micro. The buyers wanted it vented to the exterior. The micro mounts to the exterior wall so the duct is very short. When I lifted the exterior damper flap there was a gas pipe running through the center of it. They just notched around it. I called the AHJ dept. and they said it was not allowed. I told my clients what I was told. The builder came back and said the AHJ said it was Ok.
    Because of the short run through the exterior wall and is open to the exterior and not a closed system like a air handler, is this allowed? If not what is the code, I know I read it a long time ago elsewhere on this forum I think. If it can not be installed through the duct and it is code can the Local AHJ say it's ok to be there, don't they have to abide by what is written?

    Thanks

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  2. #2
    David Banks's Avatar
    David Banks Guest

    Default Re: Gas pipe run in duct

    Fuel Gas code:
    G2415.1:
    PIPING SYSTEM INSTALLATION.PROHIBITED LOCATIONS:
    : Piping shall not be installed in or through circulating air duct, clothes chute, chimney or gas vent, ventilating duct, dumbwaiter or elevator shaft.

    I would confirm with AHJ that he told the builder it was ok.


  3. #3
    Join Date
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    Default Re: Gas pipe run in duct

    Quote Originally Posted by Mike Schulz View Post
    I called the AHJ dept. and they said it was not allowed. I told my clients what I was told. The builder came back and said the AHJ said it was Ok.
    Mike,

    The sure fire way to beat the builder on that is to have your client request a letter from the AHJ stating that "it is okay" ... I doubt the builder will get it in writing, *even if* the AHJ actually did tell the builder it was okay - it is one thing for the AHJ *to say* something - there is no real legal standing on what was "said", but to *put it in writing*, then it become their official interpretation, and, if outside code, that means they have overstepped their bounds and become *PERSONALLY* liable, meaning their sovereign immunity is gone.

    From the 2006 IRC. (underlining is mine)
    - SECTION M1503
    - - RANGE HOODS
    - - - M1503.1 General. Range hoods shall discharge to the outdoors through a single-wall duct. The duct serving the hood shall have a smooth interior surface, shall be air tight and shall be equipped with a backdraft damper. Ducts serving range hoods shall not terminate in an attic or crawl space or areas inside the building.
    - - - - Exception: Where installed in accordance with the manufacturer’s installation instructions, and where mechanical or natural ventilation is otherwise provided, listed and labeled ductless range hoods shall not be required to discharge to the outdoors.
    - - - M1503.2 Duct material. Single-wall ducts serving range hoods shall be constructed of galvanized steel, stainless steel or copper.
    - - - - Exception: Ducts for domestic kitchen cooking appliances equipped with down-draft exhaust systems shall be permitted to be constructed of schedule 40 PVC pipe provided that the installation complies with all of the following:
    - - - - - 1. The duct shall be installed under a concrete slab poured on grade; and
    - - - - - 2. The underfloor trench in which the duct is installed shall be completely backfilled with sand or gravel; and
    - - - - - 3. The PVC duct shall extend not more than 1 inch (25 mm) above the indoor concrete floor surface; and
    - - - - - 4. The PVC duct shall extend not more than 1 inch (25 mm) above grade outside of the building; and
    - - - - - 5. The PVC ducts shall be solvent cemented.

    - SECTION G2415 (404)
    - - PIPING SYSTEM INSTALLATION
    - - - G2415.1 (404.1) Prohibited locations. Piping shall not be installed in or through a circulating air duct, clothes chute, chimney or gas vent, ventilating duct, dumbwaiter or elevator shaft. Piping installed downstream of the point of delivery shall not extend through any townhouse unit other than the unit served by such piping.

    While that is not really a "circulating air duct", it is a "ventilating duct", in this case it is an "exhaust duct", which is (by definition) a "ventilation" duct.

    - VENTILATION. The natural or mechanical process of supplying conditioned or unconditioned air to, or removing such air from, any space.

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  4. #4
    Join Date
    Feb 2008
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    Chicago IL
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    Default Re: Gas pipe run in duct

    No, no piping through ductwork period.
    Builder is full of BS.
    Whenever the builder claims muni insp says it is ok. I ask to see the permit sign-off. They can never produce it.

    www.aic-chicago.com
    773/844-4AIC
    "The Code is not a ceiling to reach but a floor to work up from"

  5. #5
    Join Date
    Mar 2007
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    Default Re: Gas pipe run in duct

    Quote Originally Posted by Markus Keller View Post
    I ask to see the permit sign-off.

    Markus,

    That is treading into territory you do not want to go.

    Next, the builder will be telling you is it all "OK" *because* the permit was signed off. (Which is the logical reply to what you asked for.)

    Wait ... they already tell us that ... Nope, you do not want to go there, that would just convince them that the permit being signed off actually means something.

    The better way is for the AHJ 'put it in writing' that 'such-and-such is ok' ... in addition to the permit being signed off.

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  6. #6
    Join Date
    Mar 2007
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    Fuquay Varina, NC
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    Default Re: Gas pipe run in duct

    You guy's are great, Thanks again................

    Mike Schulz License 393
    Affordable Home Inspections
    www.houseinspections.com

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