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 18-28-504.9.4.1.
Dryer Exhaust Duct Fitting Type | Equivalent Length |
4" radius mitered 45-degree elbow | 2 feet 6 inches |
4" radius mitered 90-degree elbow | 5 feet |
6" radius smooth 45-degree elbow | 1 foot |
6" radius smooth 90-degree elbow | 1 foot 9 inches |
8" radius smooth 45-degree elbow | 1 foot |
8" radius smooth 90-degree elbow | 1 foot 7 inches |
10" radius smooth 45-degree elbow | 9 inches |
10" 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.
(Amend Coun. J. 9-14-21, p. 35949, Art. V, § 11)