What is the minimum height requirement for gas vents above the peak of a roof?

The minimum height requirement for gas vents above the peak of a roof is essential for ensuring safe and effective venting of combustion gases. The correct standard specifies that gas vents must extend at least 2 feet above the peak of the roof and additionally, a total minimum height of 3 feet above the roof for effective dispersion of flue gases. This requirement helps prevent the risk of backdrafting, where combustion gases could be drawn back into a building instead of being vented outside.

Achieving this height aids in dispersing the gases into the atmosphere, minimizing the chance of harmful substances re-entering the living space. Also, a higher vent reduces the possibility of obstruction from roof structures or nearby buildings, ensuring compliance with safety regulations and effective operation of the gas appliances connected to the vent.

The other options do not meet these specific criteria set forth in the plumbing codes, making them inadequate for ensuring proper venting practices.