In plumbing terminology, what does the term 'Stack' refer to?

The term 'Stack' in plumbing refers specifically to a vertical pipe that is designed to carry wastewater and vent gases from the plumbing system. Stacks play a critical role in the drainage and venting system of buildings, as they facilitate the removal of waste from fixtures and help maintain proper air pressure within the plumbing system to prevent siphoning and backflow. Typically, stacks connect to various fixtures and allow for the effective removal of sewage while also venting harmful gases outside, thus ensuring a safe and efficient plumbing system.

Understanding the function of a stack is vital in plumbing design, as it impacts the overall drainage system's efficiency and adherence to building codes.