Pros and Cons of Using AAVs

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by dondiy, Oct 17, 2007.

  1. dondiy

    dondiy New Member

    Messages:
    3
    Hi All:

    After reading many of these threads about venting, it sounds like there is never a bad time to use an AAV to vent a fixture. It also seems more cost effective to use AAVs instead of having to route pipe all the way to the roof?

    When or why would you not want to use a AAV to vent a fixture?
  2. AAVs....are great

    You will hear a howl of protests here in a while...

    their are some here that would rather use a chain saw
    and literally cut the house down to get a vent out
    the roof .......instead of a 5 dolllar AAv...


    I like them and use them sometimes..and they can be life
    savers in difficult situations..

    In my old home I installed them extensively in the basement remodel where I could not get a vent
    out of the house without doing the chain saw method...

    their is one behind the lavatory,...one behind the
    laundry, and one behind the toilet....

    they are all still working to this day...15 years later...


    depending on the codes......

    we all have our own crosses to bear...

    to each his own.....



    Last edited: Oct 18, 2007
  3. TMB9862

    TMB9862 New Member

    Messages:
    206
    Mark pretty much summed it up. First make sure they're legal in your area. If they are avoid using them if possible but if you don't have much of a choice go ahead and use one.
  4. FloridaOrange

    FloridaOrange Plumbing Designer

    Messages:
    1,317
    Location:
    SW Florida
    However you install them, make sure you leave access to the valve on the chance you need to replace one of them.
  5. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,253
    Location:
    Cave Creek, Arizona
    Aav

    AAV's have three advantages.
    1. They are cheap
    2. They are easy to install.
    3. The save installation costs

    Their main disadvantages are;
    1. If the underground drain line stops up anywhere the sink will not drain and you will not know if it is just the sink drain or the entire plumbing system that needs servicing.
    2. The will reduce negative pressures but not positive pressure which can also cause a sink not to drain.
    3. They are a handyman way to do plumbing unless the situation is so serious that they are the only solution. Ancient plumbing systems being about the only ones which qualify.
  6. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,253
    Location:
    Cave Creek, Arizona
    Aav

    AAV's have three advantages.
    1. They are cheap
    2. They are easy to install.
    3. The save installation costs

    Their main disadvantages are;
    1. If the underground drain line stops up anywhere the sink will not drain and you will not know if it is just the sink drain or the entire plumbing system that needs servicing.
    2. The will reduce negative pressures but not positive pressure which can also cause a sink not to drain.
    3. They are a handyman way to do plumbing unless the situation is so serious that they are the only solution. Ancient plumbing systems being about the only ones which qualify.
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