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  1. #1

    Default Alternative use for a down draft exhaust vent duct

    Hi everyone,

    I had a client ask me the other day if he could use an existing downdraft vent duct that runs through a concrete slab on grade to route a propane gas line in order to switch from electric cook top to a gas cook top in an island. I was under the impression that he wanted to use it as a pipe chase in stead of a ventilation duct. I later found out that he wanted to use the duct for both uses. I told him that it was unacceptable according to the current municiple code, which is 06 IRC. Was I correct?

    Thanks for any feedback.

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    George Hallaron: Owner primary inspector
    Bienvenue Home Inspections LLC
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  2. #2
    Join Date
    Mar 2007
    Location
    Spring Hill (Nashville), TN
    Posts
    5,846

    Default Re: Alternative use for a down draft exhaust vent duct

    Quote Originally Posted by George Hallaron View Post
    Hi everyone,

    I had a client ask me the other day if he could use an existing downdraft vent duct that runs through a concrete slab on grade to route a propane gas line in order to switch from electric cook top to a gas cook top in an island. I was under the impression that he wanted to use it as a pipe chase in stead of a ventilation duct. I later found out that he wanted to use the duct for both uses. I told him that it was unacceptable according to the current municiple code, which is 06 IRC. Was I correct?

    Thanks for any feedback.
    You did good!

    Honestly I would not want to have an LPG line running under a slab in a chase. If you ever had a leak and with LPG being heavier than air, you would basically have a bomb.

    - - - Updated - - -

    Scott Patterson, ACI
    Spring Hill, TN
    www.traceinspections.com

  3. #3

    Default Re: Alternative use for a down draft exhaust vent duct

    Scott,

    Thanks for the feedback.

    George Hallaron: Owner primary inspector
    Bienvenue Home Inspections LLC
    www.bienvenuehomeinspections.com

  4. #4
    Join Date
    Mar 2012
    Location
    Ben Lomond, CA
    Posts
    71

    Default Re: Alternative use for a down draft exhaust vent duct

    As a note of clarification, a gas line under a slab for a habitation is required to be in a chase pipe that is vented to allow the gas from a leak to dissipate away from the structure. There by not building up a gas pocket under the structure. You were right to tell the client that the use he had in mind was unacceptable.


  5. #5
    Join Date
    Oct 2016
    Location
    Texas
    Posts
    1

    Default Re: Alternative use for a down draft exhaust vent duct

    Quote Originally Posted by William Cline View Post
    As a note of clarification, a gas line under a slab for a habitation is required to be in a chase pipe that is vented to allow the gas from a leak to dissipate away from the structure. There by not building up a gas pocket under the structure. You were right to tell the client that the use he had in mind was unacceptable.

    I have the same situation, but I want to use the existing downdraft vent only for the gas pipeline. Will that still be a problem? Instead of the downdraft vent for exhaust, I plan to install the cooktop hood on the ceiling..


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