Air Admittance Valves / Durgo Valves at 45°???

Discussion in 'Plumbing and Central Heating' started by Antony2008, 8 Apr 2008.

  1. Antony2008

    Antony2008

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    I'm designing the pipe layout for an en-suite bathroom in my loft conversion and would like to ask if it's possible to have the air admittance valve at an angle of 45° (the reason being it will be easier to hide away if it runs parallel to the roof).

    I seem to remember reading somewhere that they need to be vertical to operate correctly but I can't find the document where I read it !

    Confirmation of 45° or 90° would be a help as the rest of the fittings I'll need to order depend on the valves orientation.


    Many thanks in advance.
    Antony
     
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  3. Bahco

    Bahco

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    Don't think it would work or be allowed either.

    Has BCO said you can have an AAV fitted? ;)
     
  4. Antony2008

    Antony2008

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    Thanks for the reply Bahco.

    I’ve checked the plans (which were passed) and while the proposed elevation shows the soil stack disappearing into the house below the original eaves, the drainage spec. states ‘… to be taken 900mm above opening windows …’ . I’ll contact the planning & building control dep’t to clarify my plans.

    I assumed that an air admittance valve could terminate in a room providing it's above the overflow level on the highest appliance - is this the case? It's what I was planning on doing (it would be much better aesthetically rather than have an unsightly soil stack extending up between the windows of the new dormer extension and beyond into the heavens! :( !).

    Antony
     
  5. kevplumb

    kevplumb

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    why fit an aav take it through the roof and vent the stack :idea:
     
  6. Antony2008

    Antony2008

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    Taking it through the roof would result in the stack exiting alongside the pitched full height dormer (which is set at 90° to the original roof pitch), where fitting stack supports would be very difficult (and I would guess unpractical) to comply with terminating 900mm above the highest window opening. It would have to run between the windows on the front of the dormer (where support clips can be mounted) if I have to run the air admit outside.

    I'd still like to take the inside route, for the reasons given earlier.

    Antony
     
  7. Bahco

    Bahco

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    Speak to BCO but you will be lucky if they allow it. :(
     
  8. megawatt

    megawatt

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    Not sure of the regs but it won't work correctly if not mounted vertically and you risk smells entering the house.

    MW
     
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  10. Antony2008

    Antony2008

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    Thanks for your input MW. I'm planning on calling into building control tomorrow to verify the reg's and plead my case :rolleyes: - if I'm lucky (as Bahco commented) I'll mount it vertically.
    As regards smells entering the house, if the valve does it's job this shouldn't be a problem.
     
  11. plumbplast

    plumbplast

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    A normal air admittance valve has to be mounted vertically or nearly vertically . Maybe 5 degrees you could get away with but no more.
    On saying that you could probably get away a greater angle , say 45 degrees with a Hunter AAV ( one of my old designs ) as this valve operates by a spring being compressed, where as all other AAV,s operate by gravity. Operating it at 45 degrees though would know doubt be outside the manufactures guarentee.
     
  12. seco services

    seco services

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    why are you dragging up all the old posts from over a yr ago ?
     
  13. slapper

    slapper

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    Its not wise to fit an AAV outside,they are susceptible to freezing shut,therefore creating a vacuum in the drain.
     
  14. seco services

    seco services

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    their are purpose external one now. ;)
     
  15. kevplumb

    kevplumb

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    cos they mention durgos seems to be a pet subject :LOL: :LOL: :LOL: ;)
     
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