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The maximum length of the exhaust duct shall be 35 feet (10 668 mm) from the connection to the transition duct from the dryer to the outlet terminal. Where fittings are used, the maximum length of the exhaust duct shall be reduced in accordance with Table M1502.4.6.1. The maximum length of the exhaust duct does not include the transition duct.
TABLE M1502.4.6.1
DRYER EXHAUST DUCT FITTING EQUIVALENT LENGTH
DRYER EXHAUST DUCT FITTING TYPE EQUIVALENT LENGTH
4-inch radius mitered 45-degree elbow 2 feet 6 inches
4-inch radius mitered 90-degree elbow 5 feet
6-inch radius smooth 45-degree elbow 1 foot
6-inch radius smooth 90-degree elbow 1 foot 9 inches
8-inch radius smooth 45-degree elbow 1 foot
8-inch radius smooth 90-degree elbow 1 foot 7 inches
10-inch radius smooth 45-degree elbow 9 inches
10-inch radius smooth 90-degree elbow 1 foot 6 inches
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 degree = 0.0175 rad.

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504.8.4.1 Exhaust Systems, Specified Length
The maximum length of the exhaust duct shall be 35 feet (10 668 mm) from the connection to the transition duct from the dryer to the outlet terminal ...
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