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18-28-803.9  Chimney connector construction.
   Chimney connectors for low-heat appliances shall be made of sheet steel pipe that is resistant to corrosion and heat not less than that required for galvanized steel as specified in Table 18-28-803.9(1). Connectors for medium-heat appliances and high-heat appliances shall be of sheet steel not less than the thickness specified in Table 18-28-803.9(2).
Table 18-28-803.9(1)
Minimum Chimney Connector Thickness for Low- Heat Appliances
 
Diameter of Connector (inches)
Minimum Nominal Thickness (Galvanized) (inches)
5 and smaller
0.022 (No. 26 Gauge)
Larger than 5 and up to 10
0.028 (No. 24 Gauge)
Larger than 10 and up to 16
0.034 (No. 22 Gauge)
Larger than 16
0.064 (No. 16 Gauge)
 
For SI: 1 inch = 25.4 mm, 1 square inch = 645.16 mm 2 .
Table 18-28-803.9(2)
Minimum Chimney Connector Thickness for Medium- and High-Heat Appliances
 
Area
(square inches)
Equivalent Round Diameter
(inches)
Minimum Nominal Thickness
(inches)
0 – 154
0 – 14
0.060
(No. 16 Gauge)
155 – 201
15 – 16
0.075
(No. 14 Gauge)
202 – 254
17 – 18
0.105
(No. 12 Gauge)
Greater than 254
Greater than 18
0.135
(No. 10 Gauge)
 
For SI: 1 inch = 25.4 mm, 1 square inch = 645.16 mm 2 .