Furnace Vent Height Above Roof

For oil and wood burning appliances there is a very simple formula that regulates this chimney height requirement it is called 3 foot 2 foot 10 foot rule.

Furnace vent height above roof.

It s made of zinc coated galvanized steel for durability and reliability. How to vent a furnace in a roof. Details about chimney height rooftop clearance requirements on buildings for all types of chimneys is at chimney height clearance code. Goose neck vent in black can be used to cover exhaust pipes extending through your roof or for attic ventilation.

Goose neck vent the master flow 4 in. Vents must be tall enough so burned gases exit above a roof line and. All gas furnaces must be vented to allow exhaust gases from the combustion process to escape. In all areas exhaust vents should be at least 1 foot above roof surface.

Vent height where vent height is concerned taller is better. Also known as the type b this vent is operating on the natural air convection. When the vent is withdrawing air from the house it expels the gas outside through the vent. This structure generally uses the furnace vent pipe through roofbecause the b venting pipe is designed in vertical manner.

This vent is designed to be used on 4 in. This retards the ability of the flue gases to set up a good flow before encountering resistance. Vent caps 12 and smaller may terminate a distance above the roof if 8 feet or more away from a vertical surface as follows. The master flow 4 in.

As an illustration of this principle refer to figure 3. Above the roof surface with a listed cap or listed roof assembly. 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. What it means is that top of the chimney should be 3 feet above the roof surface through which it protrudes and 2 feet above anything within a 10 radius measured horizontally those are minimums.

Roof pitch rise run in inchesminimum height flat to 7 12 1 0 foot above the roof surface 7 12 to 8 12 1 5 feet above the roof surface 8 12 to 9 12 2 0 feet above the roof surface. Exhaust vents must not be located where they might be obstructed by drifting snow consult local experience as to the height of snow drifts against buildings.