What is the maximum distance a vent can be from a trap according to plumbing codes?

The maximum distance a vent can be from a trap, according to plumbing codes, is 5 feet. This distance is crucial because it ensures that the venting system effectively maintains the trap seal by preventing siphoning effects that can lead to odors and sewer gases entering the living space.

When traps are too far from their vent, it increases the risk of the trap losing its water seal due to atmospheric pressure changes or the draw of wastewater flowing through the pipes. This distance is designed to maintain the balance of pressures within the drainage system, ensuring that wastewater can flow freely while still keeping the trap sealed against gas intrusion.

Building codes are developed to ensure safety, functionality, and comfort in plumbing systems, and adhering to these standards is necessary for proper installation and maintenance in any plumbing work.