What is the typical purpose of plumbing vents?

The typical purpose of plumbing vents is to allow sewer gases to escape. Vent systems are essential for maintaining proper air pressure within the plumbing system. When wastewater flows through the pipes, it creates negative pressure, which can lead to slow drainage or even siphoning of traps, allowing sewer gases to enter the living space. Vents provide an exit route for these gases, preventing them from building up within the plumbing system and potentially causing health hazards or unpleasant odors inside buildings.

Additionally, an effective venting system allows for the equalization of air pressure, which helps maintain water flow and prevents blockages in drainage. While other functions, such as improving drainage efficiency, are also relevant, the primary role of plumbing vents focuses on addressing the safe management of sewer gases.