For venting purposes, what angle should the vent pipe rise when connecting to a horizontal pipe?

For venting purposes, a vent pipe should rise at a 45-degree angle when connecting to a horizontal pipe. This angle is optimal because it provides a balance between effective ventilation and the ability to facilitate proper drainage of any condensation that may occur within the vent system. A 45-degree slope allows for adequate airflow, which is crucial for maintaining the pressure balance in the plumbing system and preventing the backflow of gases.

Using this angle also minimizes the risk of creating traps within the venting system that could hinder the free flow of air or lead to blockages over time. By adhering to a 45-degree rise, plumbers ensure that the venting system operates efficiently and complies with plumbing codes that dictate venting practices for safety and functionality.