Vent caps 12 and smaller may terminate a distance above the roof if 8 feet or more away from a vertical surface as follows.
Furnace vent height above roof.
Per the 10 and 2 rule once you are at the level of the peak you only need to be 2 feet above it.
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.
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.
This reduces the actual required height by 12 inches from our previous calculation of 64 inches.
2 0 feet above the roof surface.
Please note that this rule doesn t generally apply to pellet and gas vent systems.
2 5 feet above the roof surface.
How to vent a furnace in a roof.
All gas furnaces must be vented to allow exhaust gases from the combustion process to escape.
Roof pitch rise run in inches.
If the pipe is farther than 10 feet from the roof.
1 5 feet above the roof surface.
Minimum height above the roof surface 1 flat to 7 12.
So 28 inches plus 24 inches is a chimney height of only 52 inches.
1 0 foot above the roof surface 1 7 12 to 8 12.
Vents must be tall enough so burned gases exit above a roof line and.