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Morning chaps, just a quick question, just up at my sisters and shes having an extension built, internal soil stack that used to vent through the roof, builders starting to roof on monday and has done away with the soil pipe through the roof, he has just put an aav into the top of the branch leading to the toilet, in other words its about 300/400mm of the floor. Am i right in thinking there is a specific height ?
Thanks in advance
Thanks in advance