What are the requirements for venting under the Uniform Plumbing Code?

The requirement that vents must connect to the drainage system and prevent trap siphonage is vital under the Uniform Plumbing Code because it ensures the proper functioning of the plumbing system while maintaining necessary air pressure. Vents are essential for allowing air to enter the drainage system, which helps to equalize pressure while wastewater flows. This prevents situations such as trap siphonage, where the water seal in traps can be drawn out, potentially allowing sewer gases to enter living spaces and impairing the system's overall efficiency.

Connecting vents to the drainage system is also important for the overall health of the plumbing system. It ensures that the drainage pipes function without unnecessary pressure build-up or siphoning of traps, which could lead to clogs or backups. Properly designed venting is crucial to maintaining the integrity of the plumbing system and ensuring that it operates as intended in both residential and commercial buildings.