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// CODE SNIPPET

803.9 Chimney Connector Construction

Mechanical Code 2018 of Utah > 8 Chimneys and Vents > 803 Connectors > 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).

TABLE 803.9(1)

MINIMUM CHIMNEY CONNECTOR THICKNESS FOR LOW-HEAT APPLIANCES

DIAMETER OF CONNECTOR
(inches)
MINIMUM NOMINAL THICKNESS
(galvanized) (inches)
5 and smaller0.022 (No. 26 gage)
Larger than 5 and up to 100.028 (No. 24 gage)
Larger than 10 and up to 160.034 (No. 22 gage)
Larger than 160.064 (No. 16 gage)

For SI: 1 inch = 25.4 mm.

TABLE 803.9(2)

MINIMUM CHIMNEY CONNECTOR THICKNESS FOR MEDIUM- AND HIGH-HEAT APPLIANCES

AREA
(square inches)
EQUIVALENT ROUND
DIAMETER
(inches)
MINIMUM THICKNESS
(inches)
0—1540—140.0575
(No. 16 gage)
155—20115—160.075
(No. 14 gage)
202—25417—180.0994
(No. 12 gage)
Greater than 254Greater than 180.1292
(No. 10 gage)

For SI: 1 inch = 25.4 mm, 1 square inch = 645.16 mm2.

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