Alliance Laundry Systems DRY710C - Manual (Page 13)

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Installation
11 513005
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
D673I D802I
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)