U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 28, 2025
A B/3 or 4 m venting system outlet must:
(a) Discharge vertically upwards; and
(b) Prevent precipitation from entering the vent system.
Regulations most recently checked for updates: Aug 28, 2025
A B/3 or 4 m venting system outlet must:
(a) Discharge vertically upwards; and
(b) Prevent precipitation from entering the vent system.