Vent Through Roof Clearance

Exhaust vents must not be allowed to be obscured or hidden by vegetation.

Vent through roof clearance.

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. 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. 6 minimum clearance from single wall vent pipe or flue vent connector to any combustible material. Vegetation must not be allowed to grow within 3 feet of an exhaust vent.

Running a vent pipe out of the roof takes some careful preparation. Plumbing vent pipes are connected to your drain system and are needed for water to drain properly. Metal b vent chimney clearance distances above and on the roof. For gas fired water heater vents.

Exhaust vents must be protected against rain and equipped with back flow prevention features e g flap dampers. Missing components such as a chimney cap. Single wall vent pipes cannot pass through a ceiling floor firewall or wall. In all areas exhaust vents should be at least 1 foot above roof surface.

An exception is made for non combustible walls such as solid masonry or concrete. We discuss fire safety fire clearances and other gas appliance venting details for b vent chimneys. This article series describes b vent metal chimneys used for gas fired appliances. 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.

When water drains air must replace the space that was taken up by the water.