What function does venting serve in a plumbing system?

Venting in a plumbing system plays a crucial role in maintaining proper function and safety. The primary purpose of venting is to equalize pressure within the plumbing system. As water drains through the pipes, it creates negative pressure, which can lead to slow drainage or siphoning of water from traps, potentially allowing sewer gases to enter the home. By providing venting, any built-up air pressure can escape, preventing these issues and ensuring that water flows freely.

Additionally, venting allows sewage gases to escape safely into the atmosphere, thus preventing harmful odors and potential health hazards from entering living spaces. This dual function of pressure equalization and gas ventilation is essential in the design of a safe and efficient plumbing system.