Roof Vent Clearances

Vegetation must not be allowed to grow within 3 feet of an exhaust vent.

Roof vent clearances.

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. 2 0 feet above the roof surface. 2 5 feet above the roof surface.

In all areas exhaust vents should be at least 1 foot above roof surface. The vent opening must communicate with outside air over an area no less than the area of the vent pipe measured on the inside. 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. 1 0 foot above the roof surface 1 7 12 to 8 12.

Table of rooftop chimney clearances for metal b vent chimneys flues. The quench vent should be a minimum of 5 m above walking surfaces. Exhaust vents must be protected against rain and equipped with back flow prevention features e g flap dampers. 1 5 feet above the roof surface.

Exhaust vents must not be allowed to be obscured or hidden by vegetation. The epa and other guidelines somewhat follow the standard codes for plumbing vent pipes which generally are vented above the buildings roof. To a height of only 2 in. 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.

Window or fresh air intake.