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boxed in air admittance valve

View the thread, titled "boxed in air admittance valve" which is posted in Air Sourced Heat Pumps Advice Forum on UK Plumbers Forums.

I'm renovating our upstairs bathroom. At the moment the soil stack is boxed in a corner within the room and exits straight through the roof. I was reading up on air admittance valves and I believe the regs say it has to be more than 200mm above the highest point of entry to the soil pipe. So I was wondering whether I can have a much shorter stack within the room, boxed in with a shelf on top?
 

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