IM WANTING a conservatory lean to, but i have a soil vent pipe in the midle of proposed build, i dont want it to penatrate building ,can i use a air admitance valve, and have a separate vent pipe two the manhole which can be outside building, its a bungalow,further down on the property there is another manhole to sewer there is i vent stack in that place,can any one please advise .
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