Forum Discussion
myredracer
Jul 02, 2019Explorer II
Lynnmor wrote:I would agree. But is an AAV required if there is vent stack to the roof within a certain distance of a sink or shower?
Not required, just permitted when the manufacturer doesn't want to do a roof vent.
Our galley tank has a vent to the roof less than 3' from the sink, plus an AAV. The vent stack in our bathroom is also less than 3' to the sink & shower. Are AAVs maybe not required in some cases but they put them in anyway? Maybe AAVs in RVs are creating more trouble than they are trying to prevent (when vent stacks are close to sinks & showers)?
In houses (here at least), a vent stack has to be within a certain distance of a plumbing fixture before an AAV is required/allowed (3'-5' IIRC) which happens when you have a kitchen island for ex.
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