[quote=resqguy]I'm building a house (owner - builder) and have a question for any plumbers about rules for vents. I have a situation where I need to run a vent horizontally above the floor but below the attic. The code says that horizontal vents have to be at least 6 in. above the flood level rim of the highest fixture served. In my case I am plumbing in a tub. What does the code mean by flood rim? Would that be the tub drain, the overflow, or the rim of the tub itself? I'm limited on how to design the vent and alternative methods would mean cutting floor trusses, or other more illegal solutions. [/quo

Google Studor Vent

You might be able to use one in your application.