In-wall vent for waterfall drain?? Air Admittance Valve or cheater vent

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by conroyt, May 31, 2012.

  1. conroyt

    conroyt New Member

    Messages:
    3
    Location:
    New Mexico
    I just had the great idea to install a waterfall in my upstairs interior wall. The pump and drain are located 1-floor below in the basement utility room.
    I've been having problems with siphoning of the upstairs waterfall drain. Sometimes the drain backs up and overflows (BIG problem), and upon waterfall start-up it will sometimes not start flowing until it gives a great big burp.
    My local plumber (great guy!) who installed the unit per manufacturers instructions tells me I need a vent near the upstairs drain. To make a long story short, the only place to vent the drain will be inside the interior wall. He suggests using a mobile-home type vent. The water being vented is always clean and will not emit noxious gases. I am slightly concerned about the potential for mold, so am thinking of putting a screen/air-vent type cover in the wall over the vent to allow for air circulation. I live in arid New Mexico.
    Is this a terrible idea or an acceptable solution? Thanks for your expertise.
  2. Terry

    Terry Administrator Staff Member

    Messages:
    14,775
    Location:
    Bothell, Washington
    Any AAV needs access to air. Whenever an AAV is installed in a wall, it needs a grill that allows air.
    That would be a good fix for your problem.

    This is a good lesson for all. You can't run a fixture from the top floor and try to "trap" on the floor below.
    The draining water develops so much speed, that it siphons the trap dry. Or installing a trap without a vent also will siphon. Plumbing 101

    [​IMG]

    Oatey Sure-Vent Wall Box
    Last edited: May 31, 2012
  3. conroyt

    conroyt New Member

    Messages:
    3
    Location:
    New Mexico
    Terry,
    Thanks for the fast response. Is there any difference between an AAV and a "cheater vent"?
  4. Terry

    Terry Administrator Staff Member

    Messages:
    14,775
    Location:
    Bothell, Washington
    Cheater Vent.
    Who makes something called a Cheater? I would love to see someone try to market that name.

    AAV stands for Air Admittance Valve. That's the term that the plumbing industry uses.

    Has anyone ever seen something marketed as a "cheater vent"?
    Last edited: May 31, 2012
  5. conroyt

    conroyt New Member

    Messages:
    3
    Location:
    New Mexico
    Last edited by a moderator: Apr 27, 2013
  6. Terry

    Terry Administrator Staff Member

    Messages:
    14,775
    Location:
    Bothell, Washington
    That thing that Home Depot sells isn't a legal vent.
    But then a lot of what Home Depot sells won't pass a plumbing inspection. It drives the inspectors nuts, having the tell the homeowner that they installed the wrong parts.

    [​IMG]

    NOT LEGAL
    Last edited: Apr 27, 2013
  7. Chad Schloss

    Chad Schloss Member

    Messages:
    328
    Location:
    USA
    "That thing that Home Depot sells isn't a legal vent. "


    but it is actually labeled as a cheater vent, lol. now that's funny :)
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