Furnace Vent Pipe Clearance Height Above Roof

If the previous calculation results in the required height of 64 inches we can see that the top of the pipe will not rise above the roof peak but would still meet the requirements of the rule.

Furnace vent pipe clearance height above roof.

The top of the chimney should be at least 3 ft 0 92 m above the roof surface. Table of type b vent rooftop clearance requirements. Above the roof plumbing vent height. Table illustrations of the required space between a direct or side wall vent for a gas fired heating appliance and building windows doors corners gas meter air intakes sidewalks balconies.

For gas fired water heater vents. Upc i 906 1 and 906 2. If the pipe is farther than 10 feet from the roof. When the vent is withdrawing air from the house it expels the gas outside through the vent.

Single wall vent pipes cannot pass through a ceiling floor firewall or wall. This specification makes sure steep roof slopes are cleared. The 1992 vent sizing tables require that all type b gas vents terminate above the roof with a listed cap or listed roof assembly in accordance with the manufacturer s instructions. For gas vents or a type l vent this distance above the roof surface must be at least 2 ft 0 61m.

The top of a chimney pipe must extend at least 2 feet above the peak of the roof if the pipe is within 10 feet of the peak. An exception is made for non combustible walls such as solid masonry or concrete. This structure generally uses the furnace vent pipe through roofbecause the b venting pipe is designed in vertical manner. Also known as the type b this vent is operating on the natural air convection.

Vent caps 12 and smaller may terminate a distance above the roof if 8 feet or more away from a vertical surface as follows. Vent pipes should extend to outdoors above the building roof and should terminate vertically not less than 6 above the roof surface nor more than 24 and must be at least 12 from any vertical surface such as a nearby sidewall. For 18 feet of run you would have a rise of 72 inches. Notes to the table above 1 measure on the up roof or shorter height side of the chimney 2 watch out.

For the next example you have a shorter chimney height. Gas appliance direct vent clearances distances from direct gas vent to building features sidewall vent direct vent direct exhaust systems for gas fired heaters water heaters other appliances.