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512100
8
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.
Table 1
NOTE: The maximum length of a 4 in. (10.2 cm)
diameter flexible metal duct must not exceed
7.87 ft. (2.4 m), as required to meet UL2158, clause
7.3.2A.
Number of
90° Elbows
Weather Hood Type
Recommended
Use Only for Short Run installations
Maximum length of 4 in. (10.2 cm) diameter rigid metal duct.
0
65 feet (19.8 m)
55 feet (16.8 m)
1
55 feet (16.8 m)
47 feet (14.3 m)
2
47 feet (14.3 m)
41 feet (12.5 m)
3
36 feet (11.0 m)
30 feet (9.1 m)
4
28 feet (8.5 m)
22 feet (6.7 m)
NOTE: Deduct 6 feet (1.8 m) for each additional elbow.
4 in.
(10.2 cm)
4 in.
(10.2 cm)
2-1/2 in.
(6.35 cm)
D673I
D802I
