Locker room shower vent

[Massplumber]

I have three showers on their own branch. Can I wet vent them on a vent I pull on the middle shower or do they have to be individually vented

 

[wwhitney]

See if the MA code allows "circuit venting". It's intended for this sort of application, and you'd just pull a dry vent off the common horizontal branch between the upstream-most two showers.

Cheers, Wayne