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  1. #1
    imported_John Smith's Avatar
    imported_John Smith Guest

    Default AC Primary drain vent

    I have seen several of these lately with tape over the open end. Sorry I dont have a picture, but try to envision the small vertical vent pipe (~ 6" in length) next to the evaporator coil. I skimmed the IRC, but didnt see anything about it.

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  2. #2
    Join Date
    Mar 2007
    Location
    Ormond Beach, Florida
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    25,309

    Default Re: AC Primary drain vent

    Vent should be on opposite side of trap from AHU.

    If not, it only serves as a clean out, and allows air to be sucked in or blown out, wasting energy (and, if sucking in, sucks in unfiltered air).

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

  3. #3
    imported_John Smith's Avatar
    imported_John Smith Guest

    Default Re: AC Primary drain vent

    Yes, the vent is downstream of the trap. Im starting to question my understanding of this. I thought the vent was supposed to be open and not taped over or capped. I havent missed some new rule or change in physics have I?


  4. #4
    Join Date
    Mar 2007
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    Ormond Beach, Florida
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    25,309

    Default Re: AC Primary drain vent

    Quote Originally Posted by imported_John Smith View Post
    Yes, the vent is downstream of the trap. Im starting to question my understanding of this. I thought the vent was supposed to be open and not taped over or capped. I havent missed some new rule or change in physics have I?
    If it is downstream of the trap, it could be a vent, and would be open.

    If it is upstream of the trap, it could be a cleanout access, and would be capped.

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

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