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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Where the drainage system cannot drain by gravity to the sewer, an automatic pump or ejector can be used to discharge
the soil and waste. The cover for the pump should be tightly sealed (gas-tight). Sumps, other than pneumatic
ejectors, should be vented with a minimum 1-1/4-inch diameter vent pipe. Pumps use mechanical methods to discharge,
and pneumatic ejectors use air pressure. Grinder pumps and ejectors pulverize solids to a near-liquid state and pump
the slurry to the drainage system.
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combined.EstablishedAll CMIs® have been in the inspection business for at least three years prior to becoming
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the best.
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Globe valves tend to be restrictive, but can be used to control water flow.
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