Furnace Vent Height Above Roof

Exhaust vents must not be allowed to be obscured or hidden by vegetation.

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. 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 gas vents that are over 12 inches 305 mm in size or are located less than 8 feet 2438 mm from a. This reduces the actual required height by 12 inches from our previous calculation of 64 inches. 2 5 feet above the roof surface.

1 0 foot above the roof surface 1 7 12 to 8 12. This structure generally uses the furnace vent pipe through roofbecause the b venting pipe is designed in vertical manner. Vegetation must not be allowed to grow within 3 feet of an exhaust vent. Exhaust vents must be protected against rain and equipped with back flow prevention features e g flap dampers.

Above the roof surface with a listed cap or listed roof assembly. So 28 inches plus 24 inches is a chimney height of only 52 inches. Also known as the type b this vent is operating on the natural air convection. 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.

Please note that this rule doesn t generally apply to pellet and gas vent systems. Run the vent pipe up through the roof and install a metal or pvc flashing collar over it. 1 5 feet above the roof surface. Table of rooftop chimney clearances for metal b vent chimneys flues.

Roof pitch rise run in inches. 5 above the flue collar e g. Match the vent pipe to the furnace maker s recommendations either sheet metal or vinyl. When the vent is withdrawing air from the house it expels the gas outside through the vent.

2 0 feet above the roof surface. In all areas exhaust vents should be at least 1 foot above roof surface. A gas vent shall terminate in accordance with one of the following.