The purpose of venting in drainage systems is primarily to?

Venting in drainage systems serves the crucial function of preventing siphoning, which can occur when water flows through a drain. When water drains from fixtures, it creates negative pressure or vacuum conditions in the drainage pipes. This negative pressure can lead to siphoning, where the water in traps may be drawn out, allowing sewer gases to enter the living spaces. By allowing air to enter the system, vents help to equalize pressure, ensuring that the water in traps remains intact and effectively seals out sewer gases.

Additionally, this pressure balance provided by proper venting also promotes smooth drainage by allowing waste and water to flow freely without obstruction. While venting does help with some aspects of noise reduction and may indirectly support aspects of drainage and pressure, its primary role in maintaining a healthy and safe drainage system is to prevent siphoning.