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803.9 Chimney Connector Construction
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Chimney connectors for low-heat appliances shall be of sheet steel pipe having resistance to corrosion and heat not less than that of galvanized steel specified in Table 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 803.9(2).
MINIMUM CHIMNEY CONNECTOR THICKNESS FOR LOW-HEAT APPLIANCES
| DIAMETER OF CONNECTOR (inches) | MINIMUM NOMINAL THICKNESS (galvanized) (inches) |
| 5 and smaller | 0.022 (No. 26 gage) |
| Larger than 5 and up to 10 | 0.028 (No. 24 gage) |
| Larger than 10 and up to 16 | 0.034 (No. 22 gage) |
| Larger than 16 | 0.064 (No. 16 gage) |
For SI: 1 inch = 25.4 mm.
MINIMUM CHIMNEY CONNECTOR THICKNESS FOR MEDIUM- AND HIGH-HEAT APPLIANCES
| AREA (square inches) | EQUIVALENT ROUND DIAMETER (inches) | MINIMUM THICKNESS (inches) |
| 0—154 | 0—14 | 0.0575 (No. 16 gage) |
| 155—201 | 15—16 | 0.075 (No. 14 gage) |
| 202—254 | 17—18 | 0.0994 (No. 12 gage) |
| Greater than 254 | Greater than 18 | 0.1292 (No. 10 gage) |
For SI: 1 inch = 25.4 mm, 1 square inch = 645.16 mm2.
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