Venting Under a Porch-National Code Reference

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by North Jersey, Oct 7, 2009.

  1. North Jersey

    North Jersey New Member

    Messages:
    107
    I finally broke down and bought a direct vent tankless water heater to overcome the combustion problem I was facing with the standard power vent model I own. At any rate, I find myself in need of venting the heater under a 7' unenclosed entry porch. I'm looking for a national code reference that addresses clearance under a porch. I searched ANSI Z223.1/ NFPA 54, but I couldn't find anything. Canadian code requires 1' clearance from the porch and, I believe, two unenclosed sides. I'm looking for something that will convince my local inspector that this is an acceptable location for the termination.
  2. jimbo

    jimbo Plumber

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    8,997
    Location:
    San Diego
    National Fuel Gas Code 12.3.5....direct vent appliances shall be installed in accordance with manufacturer's instructions..and with 12.9.3, which says for up to 50,000 BTU, vent terminal shall not be within 9" of any opening into the building.


    That's all I can find. Can not find specifics about under the porch. Check with the mfg.
  3. North Jersey

    North Jersey New Member

    Messages:
    107
    Thanks. I'll bring the 9" clearance thing to the inspector. The manufacturer (Takagi) has guidance for Canada (12" clearance from the deck), but says to defer to local guidance in the US. *update* The inspector bought off on the vent under the porch.
    Last edited by a moderator: Oct 8, 2009
  4. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego

    And thus the buck is passed.
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