hello, im installing a new bathroom in the basement and im looking for options to vent it, i have 2 stacks coming into the bsement but both have washrooms and other attached to them on the second story and first, is it code to vent to the outside at ground lvl...or do i have to run a new stack up to attic or is there a way to attach to the stacks without wet venting ? i'm kinda stuck till i figure this out so i can continue with the drywall...all comments welcome...thks