§ 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 mm2.

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 mm2.

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