Exhaust Vent Height Above Roof

Table of rooftop chimney clearances for metal b vent chimneys flues.

Exhaust vent height above roof.

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. 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. Exhaust vents must be protected against rain and equipped with back flow prevention features e g flap dampers.

Plumbing vent height above sloped roof i have a main vent and a sink vent and both are only 6 high above the roof. Please note that this rule doesn t generally apply to pellet and gas vent systems. Vegetation must not be allowed to grow within 3 feet of an exhaust vent. 1 0 foot above the roof surface 1 7 12 to 8 12.

National fire protection association nfpa standard 45 specifies a minimum stack height of 10 ft to protect rooftop work ers. The slope is about 4 high for every 12 horizontal. Vents must be tall enough so burned gases exit above a roof line and. Minimum height above the roof surface 1 flat to 7 12.

Standard z9 5 recommends a minimum stack height of 10 ft above the adjacent roof line an exhaust velocity v e of 3000 fpm and a stack height extending one stack diameter above any architectural screen. A gas vent shall terminate in accordance with one of the following. Exhaust vents must not be allowed to be obscured or hidden by vegetation. 1 5 feet above the roof surface.

This reduces the actual required height by 12 inches from our previous calculation of 64 inches. Roof pitch rise run in inches. Above the roof surface with a listed cap or listed roof assembly. All gas furnaces must be vented to allow exhaust gases from the combustion process to escape.

So 28 inches plus 24 inches is a chimney height of only 52 inches. In all areas exhaust vents should be at least 1 foot above roof surface.