Furnace Vent Height Above Roof

A gas vent shall terminate in accordance with one of the following.

Furnace vent height above roof. Exhaust vents must be protected against rain and equipped with back flow prevention features e g flap dampers. 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. 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. Minimum height above the roof surface 1 flat to 7 12.

When the vent is withdrawing air from the house it expels the gas outside through the vent. 2 5 feet above the roof surface. 1 5 feet above the roof surface. 5 above the flue collar e g.

Above the roof surface with a listed cap or listed roof assembly. In all areas exhaust vents should be at least 1 foot above roof surface. Vegetation must not be allowed to grow within 3 feet of an exhaust vent. Roof pitch rise run in inches.

Run the vent pipe up through the roof and install a metal or pvc flashing collar over it. Please note that this rule doesn t generally apply to pellet and gas vent systems. 1 0 foot above the roof surface 1 7 12 to 8 12. So 28 inches plus 24 inches is a chimney height of only 52 inches.

This reduces the actual required height by 12 inches from our previous calculation of 64 inches. 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 not be allowed to be obscured or hidden by vegetation. Match the vent pipe to the furnace maker s recommendations either sheet metal or vinyl.

Table of rooftop chimney clearances for metal b vent chimneys flues. Chimney chimney flue must terminate min. 2 0 feet above the roof surface.