Natural Gas Vent Roof

As well as those suitable for category i gas fired appliances with b vent or appliances with a draft hood.

Natural gas vent roof.

Also known as the type b this vent is operating on the natural air convection. This structure generally uses the furnace vent pipe through roofbecause the b venting pipe is designed in vertical manner. Gas vents 12 inches 305 mm in size or smaller with listed caps shall be permitted to be terminated in accordance with figure g2427 6 5 provided that such vents are at least 8 feet 2438 mm from a vertical wall or similar obstruction. Aluminum 012 inner wall galvanized 018 outer wall.

Above the roof surface with a listed cap or listed roof assembly. Gas vents that are 12 inches 305 mm or less in size and located not less than 8 feet 2438 mm from a vertical wall or similar obstruction shall terminate above the roof in accordance with figure 503 6 4. A gas vent shall terminate in accordance with one of the following. Gas vents that are over 12 inches 305 mm in size or are located less than 8 feet 2438 mm from a vertical wall or similar obstruction shall terminate not less than 2 feet 610 mm above the highest point where they pass through the roof and not less than 2 feet 610.

Kits in this category include those designed for natural draft appliances using gas oil or wood. When the vent is withdrawing air from the house it expels the gas outside through the vent. Materials and construction round type b gas vent 3 8 and oval 4 6. Gas vents that are 12 inches 305 mm or less in size and located not less than 8 feet 2438 mm from a vertical wall or similar obstruction shall terminate above the roof in accordance with figure 802 6 2 and table 802 6 2.

Use with natural gas or liquid propane category i and draft hood equipped appliances and appliances tested and listed to use type b gas vent. A gas vent shall terminate in accordance with one of the following.