"IMM" wrote in message
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"Danny Monaghan" wrote in message
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"BigWallop" wrote in
:

If this stack is an outlet from a WC, then get ready for the smells
Sir. A soil stack should vent to air, if at all possible, as it vents
rather unpleasant gases and fumes into where ever the end of it is.

Forgive me if I'm not following this, but isn't the whole idea of an air
admittance valve that it let's air in to stop syphoning from vacuum, but
doesn't let air, and therefore smell, out?

Yes. But you get the occasional smell and thump as it drops onto its
seating. HepVo is the better bet here.


I should have mentioned that the valve will be boxed in behind plasterboard.