Chimneys should extend at least 2 feet higher than any portion of a building within 10 feet, but not less than 3 feet
above the highest point where the chimney passes through the roof. This is known a the 3-2-10 Rule for Chimneys.
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Fuel-Gas Vent Terminations
The type of venting materials used for fuel-gas vent terminations depends on the operating characteristics of the
appliance being vented. Appliances can be characterized with respect to:
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Each piece of equipment and appliance should be provided with a shut-off valve which is separate from the appliance
to permit maintenance, repair, replacement and temporary disconnection. The shut-off valve should be adjacent to the
appliance, no farther away than 6 feet, conspicuously located, and within reach.
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Individual, branch and circuit vents are permitted to terminate with a connection to an individual or branch-type air-admittance valve. Stack vents and vent stacks should be permitted to terminate to stack-type air-admittance valves. Access should be provided to all air-admittance valves. The air-admittance valve should be rated according to the size of the vent to which it is connected. www.nachi.org
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A common vent is one vent that serves more than one fixture, functioning as an individual vent for each fixture. Wet
venting is venting single or double bathroom groups or combinations thereof, where one vent pipe may serve all the
fixtures connected to the wet vent. Waste-stack venting is venting individual fixtures through a drainage stack, and
the over-sized stack functions as the vent. Circuit venting is venting up to eight fixtures with a single vent pipe.
A combination drain-and-vent system is restricted to floor drains, sinks and lavatories, and relies on the
over-sized drain pipe. Island-fixture venting has a vent installed below the flood-level rim of the fixture before
rising to connect to another vent.
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