Originally Posted by bankr63
In the building code, yes. AAV's, where permitted, should be located above the spill level of the associated fixture.
In the RV code...
Oh wait, we don't need no stinkin'
(Pun wasn't intended, but it works...)
Cubman, one other modification that many say works well. There are vent caps that can prevent backpressure through the roof vents (if equipped). They work like an airfoil to keep constant negative pressure on the tank stack - sucks the odors out of the tank instead of letting them backup into the trailer when the wind is right. I haven't personally tried them, but did a bit of research and a lot people believe in them. Is on my future mods list.
It's spelt steeekin' if'n you wanna quote the move....
And, yeah I totally forgot about how building codes influence the construction of RV's.
Glad to hear all is OK now.