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I am making 2 bathrooms out of one in the basement and there is a 3rd above it as well. They all will be within 10 feet of an existing 2in vent. How many sinks, toilets and showers can use the same vent efficiently. Is there another venting option other than an aav if too much trouble to run another vent line through the roof?:jester:
 

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not near enough info.
What is now served and what will be added to the 2" vent? There is a limit
 

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already existing

From what I can see there already was 2 toilets, 2 showers, and 2 sinks. I would like to add another sink, toilet and shower.
 

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You would be better to go with a central venting unit, that uses one motor and then ducts to the various spaces. It is sized to the total of the spaces that will be using it.
 
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