Mechanical Code…
- Vent
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A listed factory-made vent pipe and vent fittings for conveying flue gases to the outside atmosphere.
- Type B Gas Vent
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A factory-made gas vent listed by a nationally recognized testing agency for venting listed or approved appliances equipped to burn only gas.
- Type BW Gas Vent
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A factory-made gas vent listed by a nationally recognized testing agency for venting listed or approved gas-fired vented wall furnaces.
- Type L
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A venting system consisting of listed vent piping and fittings for use with oil-burning appliances listed for use with Type L or with listed gas appliances.
(Uniform Mechanical Code® 224.0)