Air Admittance Valves

[Jimcro]

Could someone let me know the minimum height an AAV should be sited above the inlet pipe through which the soil flows into the stack pipe?

I am concerned that I have foul air entering an ensuite from the toilet.

Thanks.

 

[petertheplumber12]

About 500mm

 

[denso13]

It should be above the spill level of the highest appliance connected, usually the basin.

 

[newbuildinstaller]

It should be above the spill level of the highest appliance connected, usually the basin.

lowest i thought/was taught (because of blockages)

 

[CBF]

no highest as denso said

 

[Nige F]

indeed - so if the WC blocks and the bath too then the water will fill the basin and spill over onto the floor - but the AAV will be OK - seems to me no logic but it`s the regs What if the bath and the basin had HepV O valves