Furnace Vent Height Above Roof

Chimney chimney flue must terminate min.

Furnace vent height above roof. Minimum height above the roof surface 1 flat to 7 12. A gas vent shall terminate in accordance with one of the following. 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 structure generally uses the furnace vent pipe through roofbecause the b venting pipe is designed in vertical manner.

When the vent is withdrawing air from the house it expels the gas outside through the vent. 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. Exhaust vents must not be allowed to be obscured or hidden by vegetation. Table of rooftop chimney clearances for metal b vent chimneys flues.

1 0 foot above the roof surface 1 7 12 to 8 12. 1 5 feet above the roof surface. 5 above the flue collar e g. Water heater installed close to the roof framing would need at least 5 long vertical vent pipe single wall vent pipe requires minimum 6 of clearance to combustible materials general rule the chimney should not be outside a window or other house opening.

2 0 feet above the roof surface. Exhaust vents must be protected against rain and equipped with back flow prevention features e g flap dampers. Match the vent pipe to the furnace maker s recommendations either sheet metal or vinyl. Roof pitch rise run in inches.

Per the 10 and 2 rule once you are at the level of the peak you only need to be 2 feet above it. So 28 inches plus 24 inches is a chimney height of only 52 inches. Above the roof surface with a listed cap or listed roof assembly. Please note that this rule doesn t generally apply to pellet and gas vent systems.

In all areas exhaust vents should be at least 1 foot above roof surface. 2 5 feet above the roof surface. This reduces the actual required height by 12 inches from our previous calculation of 64 inches.