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803.6 Automatic dampers.
Automatically operated dampers shall be equipped with safety controls and shall be of a listed type. Such safety controls shall be capable of demonstrating operation of the damper and appropriate draft before appliance operation. The automatically operated dampers shall be installed in accordance with the manufacturer's instructions. An automatic vent damper device shall not be installed on an existing appliance unless the appliance is listed and labeled and the device is installed in accordance with the terms of its listing. The name of the installer and date of installation shall be marked on a label affixed to the damper device.
803.7 Connectors serving two or more appliances.
Where two or more connectors enter a common vent or chimney, the smaller connector shall enter at the highest level consistent with available headroom or clearance to combustible material.
803.8 Vent connector construction.
A vent connector for a nonresidential, low-heat appliance shall be a factory-built chimney section or steel pipe having resistance to heat and corrosion equivalent to that for the appropriate galvanized pipe as specified in Table 803.8. Factory-built chimney sections shall be joined together in accordance with the chimney manufacturers' instructions.
Diameter of Connector (inches) | Minimum Thickness (inches) |
Less than 6 | 0.019 (No. 28 gage) |
6 to less than 10 | 0.023 (No. 26 gage) |
10 to 12 inclusive | 0.029 (No. 24 gage) |
14 to 16 inclusive | 0.034 (No. 22 gage) |
Over 16 | 0.056 (No. 16 gage) |
For SI: 1 inch = 25.4 mm.
803.9 Chimney connector construction.
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).
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.
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 mm
2
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803.10 Installation.
Connectors shall be installed in accordance with Sections 803.10.1 through 803.10.6.
803.10.1 Supports and joints.
Connectors shall be supported in an approved manner, and overlapping joints shall be tight-fitting and fastened with sheet metal screws, rivets, welds or other approved means.
803.10.2 Length.
The maximum horizontal length of a single- wall connector shall not affect the capability of the system to produce adequate draft.
803.10.3 Connection.
The connector shall extend to the inner face of the chimney or vent liner, but not beyond. A connector entering a masonry chimney shall be cemented to masonry in an approved manner. Where thimbles are installed to facilitate removal of the connector from the masonry chimney, the thimble shall be permanently cemented in place with high-temperature cement.
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