Air Admittance Valve Below Flood Level ???

Discussion in 'Plumbing and Central Heating' started by chrisfi, 10 May 2010.

  1. chrisfi


    9 Dec 2009
    Thanks Received:
    United Kingdom
    I’m refitting my bathroom and it would be helpful if I could slightly lower the Air Admittance Valve (AAV).

    I note from this forum and other www sources that the AAV should be fitted above the flood level of the highest appliance or above the trap level of the highest appliance. These may mean the same thing, but I would have thought the flood level of a basin is a bit higher than the trap level….

    Anyway I have recently noted from the McAlpine catalogue that their AAVs can be fitted either above or below the flood level. Have the regulations changed, do McAlpine manufacture special AAVs, do other manufacturers supply equivalent AAVs?

    Also, how would I calculate the required air flow capacity to specify the AAV?

    Thanks in advance,

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