Installation
Exhaust System
For best drying results, recommended maximum length of exhaust system is shown in Table 1.
To prevent backdraft when dryer is not in operation, outer end of exhaust pipe must have a weather hood with hinged dampers (obtain locally).
NOTE: Weather hood should be installed at least 12 inches (30.5 cm) above the ground. Larger clearances may be necessary for installations where heavy snowfall can occur.
Number of |
| Weather Hood Type | |
90° Elbows | Recommended |
| Use Only for Short Run installations |
| 4 in. | 4 in. | |
| (10.2 cm) | (10.2 cm) | |
|
|
| (6.35 cm) |
|
| D673I | D802I |
Maximum length of 4 in. (10.2 cm) diameter rigid metal duct.
0
1
2
3
4
65 feet (19.8 m) | 55 feet (16.8 m) |
55 feet (16.8 m) | 47 feet (14.3 m) |
47 feet (14.3 m) | 41 feet (12.5 m) |
36 feet (11.0 m) | 30 feet (9.1 m) |
28 feet (8.5 m) | 22 feet (6.7 m) |
|
|
NOTE: Deduct 6 feet (1.8 m) for each additional elbow.
Table 1
NOTE: The maximum length of a 4 in. (10.2 cm) diameter flexible metal duct must not exceed
7.87ft. (2.4 m), as required to meet UL2158, clause 7.3.2A.
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