If vent #5 has a developed length of 50 ft., what is the minimum size of the vent required?

To determine the minimum size of the vent required for a developed length of 50 feet, it's important to reference plumbing codes, which provide sizing tables and standards based on the length and type of venting.

For residential plumbing, vents serve the purpose of allowing gases to escape and providing necessary air to prevent siphoning of water from traps. The size of the vent must accommodate the expected flow while also factoring in the distance the vent travels.

In many plumbing codes, including the Uniform Plumbing Code (UPC) or International Plumbing Code (IPC), the minimum diameter for vent pipes can vary depending on the length. A developed length of 50 feet typically exceeds the limits for smaller vent sizes, such as 1 inch or 1-1/4 inch, which are aimed at shorter runs or lower fixture counts.

A 1-1/2 inch vent size is often utilized for longer runs because it provides adequate airflow and reduces the risk of venting problems associated with increased distances, such as pressure buildup or inefficient drainage. Thus, a vent size of 1-1/2 inch is considered the minimum acceptable size for a developed length of 50 feet in a typical residential setting.

In summary, selecting 1-1/2 inch as the