Minimum Gas Appliance Vent Clearance From Roof

Common vent systems are prohibited.

Minimum gas appliance vent clearance from roof.

Each gas appliance must use a separate vent system. The minimum clearance to a perpendicular wall extending past the face of the fireplace is one inch 25 mm. 3 chimney vent caps larger than 12 must be located at least 2 feet above the highest point and 2 feet higher than any portion of the building within a horizontal distance of 10 feet. Gas fireplace direct vent termination cap clearance distances clearances between the gas fireplace exhaust vent and other building components or features.

Number 2 is a vent for an exhaust fan like those found in bathrooms and laundry rooms. Stack vents may give off sewer gas so they should not be located within 3 feet of an operable window. This article gives typical clearance distance requirements between the termination cap of a gas fireplace or fireplace insert and other building or site features such as windows doors other mechanical system components air intakes. Inspect the external vent cap on a regular basis to make sure that no debris is interfering with the air.