Roof Vent Clearances

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

Roof vent clearances.

1 0 foot above the roof surface 1 7 12 to 8 12. The exit point for the quench vent pipe should be located away from operable windows and air inlets. Roof pitch rise run in inches. The vent when protected from snow closure by the panel design can be cut down from the minimum height of 6 in.

1 5 feet above the roof surface. In all areas exhaust vents should be at least 1 foot above roof surface. The 2 10 rule states that combustion vents should terminate at least 2 feet above any part of the roof within 10 feet. The vent opening must communicate with outside air over an area no less than the area of the vent pipe measured on the inside.

The epa and other guidelines somewhat follow the standard codes for plumbing vent pipes which generally are vented above the buildings roof. 2 0 feet above the roof surface. Minimum height above the roof surface 1 flat to 7 12. Window or fresh air intake.

The quench vent should be a minimum of 5 m above walking surfaces. Exhaust vents must not be allowed to be obscured or hidden by vegetation. Manufacturers recommendations usually take precedence over local building codes but you won t know for sure which takes precedence or what those manufacturers recommendations are. Exhaust vents must be protected against rain and equipped with back flow prevention features e g flap dampers.

New york state just raised plumbing vent pipe code from 12 inches to 18 inches above the roof and at least 10 feet horizontal distance from any opening to the building i e.