§ 18-28-803.9 — Chimney connector construction

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 .