Furnace Vent Height Above Roof

Chimney chimney flue must terminate min.

Furnace vent height above roof.

Table of rooftop chimney clearances for metal b vent chimneys flues. 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. Above the roof surface with a listed cap or listed roof assembly. 2 0 feet above the roof surface.

5 above the flue collar e g. Minimum height above the roof surface 1 flat to 7 12. 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.

When the vent is withdrawing air from the house it expels the gas outside through the vent. Match the vent pipe to the furnace maker s recommendations either sheet metal or vinyl. Exhaust vents must be protected against rain and equipped with back flow prevention features e g flap dampers. Also known as the type b this vent is operating on the natural air convection.

In all areas exhaust vents should be at least 1 foot above roof surface. 2 5 feet above the roof surface. 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. Run the vent pipe up through the roof and install a metal or pvc flashing collar over it.

So 28 inches plus 24 inches is a chimney height of only 52 inches. Exhaust vents must not be allowed to be obscured or hidden by vegetation. 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. Please note that this rule doesn t generally apply to pellet and gas vent systems.

This reduces the actual required height by 12 inches from our previous calculation of 64 inches. Vegetation must not be allowed to grow within 3 feet of an exhaust vent. A gas vent shall terminate in accordance with one of the following.