What is the maximum distance a plumbing vent can be from a fixture?

The maximum distance a plumbing vent can be from a sink or lavatory is 6 feet, which ensures proper venting and prevents the buildup of negative pressure that can lead to siphoning of water from trap seals. This distance allows for adequate airflow to support drainage and keep sewer gases from entering the living space.

If a vent were positioned further than this distance, it could compromise the system's effectiveness, potentially leading to problems like slow drainage or even sewage backup. The regulation of a 6-foot distance is established in plumbing codes to maintain efficiency and safety in plumbing systems, ensuring fixtures operate correctly without vent-related issues.