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// CODE SNIPPET

503.10.15 Single-Wall Connector Penetrations of Combustible Walls

NYC Fuel Gas Code 2008 > 5 Chimneys and Vents > 503 Venting of Equipment > 503.10 Vent Connectors for Category I Equipment > 503.10.15 Single-Wall Connector Penetrations of Combustible Walls
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A vent connector made of a single-wall metal pipe shall not pass through a combustible exterior wall unless guarded at the point of passage by a ventilated metal thimble not smaller than the following:
  1. For listed appliances equipped with draft hoods and appliances listed for use with Type B gas vents, the thimble shall be not less than 4 inches (102 mm) larger in diameter than the vent connector. Where there is a run of not less than 6 feet (1829 mm) of vent connector in the open between the draft hood outlet and the thimble, the thimble shall be permitted to be not less than 2 inches (51 mm) larger in diameter than the vent connector.
  2. For unlisted appliances having draft hoods, the thimble shall be not less than 6 inches (152 mm) larger in diameter than the vent connector.
  3. For residential and low-heat appliances, the thimble shall be not less than 12 inches (305 mm) larger in diameter than the vent connector.
  Exception: In lieu of thimble protection, all combustible material in the wall shall be removed from the vent connector a sufficient distance to provide the specified clearance from such vent connector to combustible material. Any material used to close up such opening shall be noncombustible.

Related Code Sections


503.10.15 Chimneys and Vents, Single-Wall Connector Penetrations of Combustible Walls
A vent connector made of a single-wall metal pipe shall not pass through a combustible exterior wall unless guarded at the point of passage ...
NYC Fuel Gas Code 2008 > 5 Chimneys and Vents > 503 Venting of Equipment > 503.10 Vent Connectors for Category I Equipment > 503.10.15 Single-Wall Connector Penetrations of Combustible Walls
503.6.13 Chimneys and Vents, Fastener Penetrations
outlet, a flue collar or a single-wall metal connector to a double-wall vent ...
NYC Fuel Gas Code 2014 > 5 Chimneys and Vents > 503 Venting of Appliances > 503.6 Gas Vents > 503.6.13 Fastener Penetrations
503.6.13 Chimneys and Vents, Fastener Penetrations
outlet, a flue collar or a single-wall metal connector to a double-wall vent ...
NYC Fuel Gas Code 2022 > 5 Chimneys and Vents > 503 Venting of Appliances > 503.6 Gas Vents > 503.6.13 Fastener Penetrations
Section 803 Chimneys and Vents, Connectors
The maximum horizontal length of a single-wall connector shall not affect the capability of the system to produce adequate draft ...
NYC Mechanical Code 2022 > 8 Chimneys and Vents > 803 Connectors
Section 803 Chimneys and Vents, Connectors
of a single- wall connector shall not affect the capability of the system to produce adequate draft ...
NYC Mechanical Code 2008 > 8 Chimneys and Vents > 803 Connectors
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