A 14-inch gas vent protruding through a roof and located 8 feet from a vertical wall must terminate not less than how many feet above the roof?

• A. 1 foot
• B. 2 feet
• C. 3 feet
• D. 4 feet

Answer: (B)

Gas vent terminations have to meet a minimum height above the roof that depends on how close the vent is to a vertical wall. If the vent is within about 10 feet of a wall, the termination must extend not less than 2 feet above the roof. In this case, the vent is 8 feet from a vertical wall, which puts it within that distance, so the minimum height is 2 feet. The other heights would either be more than required or insufficient if the vent were closer than the specified distance.