906.0 Vent Termination

Each vent pipe or stack shall extend through its flashing and shall terminate vertically not less than 6 inches (152 mm) above the roof nor less than 1 foot (305 mm) from a vertical surface.

Each vent shall terminate not less than 10 feet (3048 mm) from, or not less than 3 feet (914 mm) above, an openable window, door, opening, air intake, or vent shaft, or not less than 3 feet (914 mm) in every direction from a lot line, alley and street excepted.

Vent pipes shall be extended separately or combined, of full required size, not less than 6 inches (152 mm) above the roof or fire wall. Flagpoling of vents shall be prohibited except where the roof is used for assembly purposes or parking. Vents within 10 feet (3048 mm) of a part of the roof that is used for assembly purposes or parking shall extend not less than 7 feet (2134 mm) above such roof and shall be securely stayed.

Vent pipes for outdoor installations shall extend not less than 10 feet (3048 mm) above the surrounding ground and shall be securely supported.

Joints at the roof around vent pipes shall be made watertight by the use of approved flashings or flashing material.

(See Table 1701.1) Sheet lead shall comply with the following:

1. For safe pans - not less than 4 pounds per square foot (lb/ft²) (19 kg/m²) or ¹⁄₁₆ of an inch (1.6 mm) thick.
2. For flashings or vent terminals - not less than 3 lb/ft² (15 kg/m²).
3. Lead bends and lead traps shall be not less than ¹⁄₈ of an inch (3.2 mm) in wall thickness.

Where frost or snow closure is likely to occur in locations having minimum design temperature below 0°F (-17.8°C), vent terminals shall be not less than 2 inches (50 mm) in diameter, but in no event smaller than the required vent pipe. The change in diameter shall be made inside the building not less than 1 foot (305 mm) below the roof in an insulated space and terminate not less than 10 inches (254 mm) above the roof, or in accordance with the Authority Having Jurisdiction.