Jason April , pm. Hi there. Im currently renovating a second story bathroom. The old bathroom had the tub drain approx ‘ from the ” waste line and had its own vent .’ from the tub p trap..Richfield springs, NY. Switching stores will empty the cart. Are you sure you want to do this?.Section Clothes Dryer Exhaust . Installation. Clothes dryers shall be exhausted in accordance with the manufacturer’s instructions..Sewer vent pipes, typi.y located on the roof of the home above the bathroom, actually air into bathroom pipes to keep sewer gas inside the pipes. When the vents clog with debris such as birds’ nests, foul and sometimes flammable gases may emanate from the bathroom..