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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.
TABLE M1803.2
THICKNESS FOR SINGLE-WALL METAL PIPE CONNECTORS
DIAMETER OF
CONNECTOR (inches)
GALVANIZED SHEET
METAL GAGE
NUMBER
MINIMUM THICKNESS
(inch)
Less than 6 26 0.019
6 to 10 24 0.024
Over 10 through 16 22 0.029
For SI: 1 inch = 25.4 mm.

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