Definitions for "Vent Stack"
Keywords:  drainage, stack, pipe, plumbing, gases
A metal, plastic or composite pipe (usually 4 inch in diameter) leading from the sewage network out through the roof to prevent pressures during sewage flow.
a vertical plumbing pipe system designed to vent noxious gases and prevent siphonage from traps.
a special ventilating pipe that connects with a soil or waste stack below the lowest fixture and extends to a point above the highest fixture, where it may again connect with the stack or extend separately through the roof