[wease]

I am building a tub platform for a 42"x72" air tub. The shower stall is located right next to it and is separated by a glass partition that runs from the top of the tub deck to the ceiling. All of the draining will run from the tub to the shower stall and then continue in the same direction (all 2").

There is a back wall where I could run the vent up. The tub drain is located at the front of the top and in the middle. I was thinking I could run a vent up from the 2" drain (just before it hits the shower) up into the cavity of the tub enclosure and then across to the back wall and up. What is the rule here for vents in terms of when they can make a horizontal turn?

Running it to the shower wall after the shower drain is too far for code.

 

[TheEplumber]

Code states you must rise 6" above the highest flood rim on that floor before offsetting horizontal or connecting to other vents. If structural conditions do not allow this, then you can go horizontal, but you must use drainage fittings and grade it properly.

 

[wease]

Would a bathroom sink be considered a flood rim? I believe I won't have a choice and will have to go horizontal for about 3 feet before it goes vertical again.

 

[TheEplumber]

Yes to the sink. But I think you'll be fine. Kitchens are often offset below the rim due to the window always being above the sink