What is the maximum amount of fixtures allowed on a single battery vent?

The maximum amount of fixtures allowed on a single battery vent is 8. This limit is established to ensure proper ventilation and drainage, preventing potential issues with foul air or improper drainage from affecting the operation of the plumbing system. When more than this number of fixtures is connected to a single battery vent, it can lead to inadequate venting, which could cause siphoning of traps and ultimately result in drainage problems or odor issues.

The code aims to balance the design and function of plumbing systems, emphasizing the importance of maintaining sufficient venting for proper airflow and waste removal. This is particularly important in multi-fixture applications where the cumulative effects can overwhelm the venting capacity if not properly adhered to. Understanding these guidelines helps ensure that plumbing installations are both functional and compliant with safety standards.