What is the minimum size for vent terminals based on the stack served?

The minimum size for vent terminals, specifically for a stack served, is 1-1/2 inches. This size is typically required because it provides adequate airflow and drainage function without becoming too restrictive. Proper venting is essential for maintaining correct pressure within the plumbing system, preventing the siphoning of traps, and ensuring the effective flow of sewage gases away from the fixtures and into the atmosphere.

Larger vent sizes may be employed based on specific design considerations or codes in certain scenarios, particularly in more complex systems, but the 1-1/2 inch size serves as a standard minimum. This standardization helps ensure that all venting systems are constructed to minimize the risk of clogs and maintain efficient operation.

Understanding the basic requirements and standards, such as that for vent terminal size, is crucial for designing plumbing systems that adhere to safety and functional regulations.