Section M1803 Chimney and Vent Connectors
Connectors for oil and solid fuel-burning appliances shall be constructed of factory-built chimney material, Type L vent material or single-wall metal pipe having resistance to corrosion and heat and thickness not less than that of galvanized steel as specified in Table M1803.2.
A chimney connector or vent connector shall not pass through any floor or ceiling. A chimney connector or vent connector shall not pass through a wall or partition unless the connector is listed and labeled for wall pass-through, or is routed through a device listed and labeled for wall pass-through and is installed in accordance with the conditions of its listing and label. Connectors for oil-fired appliances listed and labeled for Type L vents, passing through walls or partitions shall be in accordance with the following:
- Type L vent material for oil appliances shall be installed with not less than listed and labeled clearances to combustible material.
- Single-wall metal pipe shall be guarded by a ventilated metal thimble not less than 4 inches (102 mm) larger in diameter than the vent connector. Not less than 6 inches (152 mm) of clearance shall be maintained between the thimble and combustibles.
|TYPE OF CONNECTOR||MINIMUM
|Single-wall metal pipe connectors:|
|Oil and solid-fuel appliances||18|
|Oil appliances listed for use with Type L vents||9|
|Type L vent piping connectors:|
|Oil and solid-fuel appliances||9|
|Oil appliances listed for use with Type L vents||3b|