Alliance Laundry Systems SFGX09*F - Manual (Page 15)

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Installation
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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
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)
Maximum length of 4 in. (10.2 cm) diameter flexible metal duct.
0 45 feet (13.7 m) 35 feet (10.7 m)
1 35 feet (10.7 m) 27 feet (8.2 m)
2 30 feet (9.1 m) 21 feet (6.4 m)
3 25 feet (7.6 m) 17 feet (5.2 m)
4 20 feet (6.1 m) 15 feet (4.5 m)
NOTE: Deduct 6 feet (1.8 m) for each additional elbow.
4 in.
(10.2 cm)
4 in.
(10.2 cm)
D673I D802I 2-1/2 in.
(6.35 cm)