Vents must rise vertically to what height before any horizontal run?

Vents must rise vertically a minimum of 6 inches before transitioning to a horizontal run to ensure proper functioning and to maintain a clear path for air circulation within the plumbing system. This vertical rise helps to create an effective air barrier, which is crucial for preventing sewer gases from entering living spaces and for aiding in the drainage of waste.

This specification is part of plumbing code regulations that uphold safety and efficiency in plumbing installations. Ensuring that vents rise to this height before going horizontal helps mitigate issues such as siphoning and backpressure, which can occur if vents are not installed correctly. Overall, this requirement serves to protect both the plumbing system and the health of the occupants in the building.