Minimum Gas Appliance Vent Clearance From Roof

Appliances designed for natural draft venting and incorporating integral venting means shall be located so that a minimum clearance of 9 inches 229 mm is maintained between vent terminals and from any openings through which combustion products enter the building.

Minimum gas appliance vent clearance from roof.

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. 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. Venting systems vent connectors slope in ft upward to chimney vent not smaller than appliance flue up to 2 sizes larger than appliance flue length depends on type for single appliance single wall 75 of vent height b vent 100 of vent height 18 inch diameter for multiple appliances 34.

Each gas appliance must use a separate vent system. Common vent systems are prohibited. 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.