Vent Through Roof Clearance

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

Vent through roof clearance.

Firestops not installed at either the top or bottom side of the joist where the vent passes through floors or the roof. For gas fired water heater vents. In all areas exhaust vents should be at least 1 foot above roof surface. One of the newest fans designed specifically for radon mitigation vents directly through the side wall similar to a dryer vent using an aspiration hood to mix and disperse the radon gas.

Single wall vent pipes cannot pass through a ceiling floor firewall or wall. Clearance distances are given for a gas appliance b vent at the rooftop. Vent pipes provide this air by running outside the structure of the house. It follows the same clearances as high efficiency gas fired heating appliances that also vent through side walls they are allowed to at least 4 feet directly.

We discuss fire safety fire clearances and other gas appliance venting details for b vent chimneys. 6 minimum clearance from single wall vent pipe or flue vent connector to any combustible material. Running a vent pipe out of the roof takes some careful preparation. Exhaust vents must not be allowed to be obscured or hidden by vegetation.

Exhaust vents must be protected against rain and equipped with back flow prevention features e g flap dampers. Plumbing vent pipes are connected to your drain system and are needed for water to drain properly. When water drains air must replace the space that was taken up by the water. Metal b vent chimney clearance distances above and on the roof.

All metal vents must terminate at least 2 feet above the roof surface and anything within 10 feet of the vent such as the crest of a roof ridge.