Air Admittance Valves

[johnst]

I may need to get rid of a boxed in SVP in corner of a first floor room.
Am thinking about an Air Admittance Valve.
Does anyone have experience of these?
Which is the best one to go for?

 

[SimonG]

Not as easy as that. Does the house have another stack? Needs checking out before you get shot.

 

[snowhead]

As it's name implies it admits air.
It needs a source of air, not usually found if the AAV gets boxed in.

 

[Ermintrude]

As it's name implies it admits air.
It needs a source of air, not usually found if the AAV gets boxed in.

U can put ventilated top on box. Aav fine in box just be sure it's over the spill over of highest appliance