Speed Queen LES37A*F - Manual (Page 22)

Installation
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Exhaust System
IMPORTANT: Keep exhaust duct as short as
possible.
NOTE: Be certain old ducts are cleaned before
installing your new dryer.
For best drying results, recommended maximum
length of exhaust system is shown in table below.
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
30.5 cm (12 inches) above the ground.
Number of
90° Elbows
Weather Hood Type
Recommended Use Only for Short Run Installations
Maximum length of 10.2 cm (4 in.) diameter rigid metal duct.
0 19.8 m (64 ft.) 16.8 m (55 ft.)
1 16.8 m (55 ft.) 14.3 m (47 ft.)
2 14.3 m (47 ft.) 12.5 m (41 ft.)
3 11.0 m (36 ft.) 9.1 m (30 ft.)
4 8.5 m (28 ft.) 6.7 m (22 ft.)
Maximum length of 10.2 cm (4 in.) diameter flexible metal duct.
0 13.7 m (45 ft.) 10.7 m (35 ft.)
1 10.7 m (35 ft.) 8.2 m (27 ft.)
2 9.1 m (30 ft.) 6.4 m (21 ft.)
3 7.6 m (25 ft.) 5.2 m (17 ft.)
4 6.1 m (20 ft.) 4.5 m (15 ft.)
NOTE: Deduct 1.8 m (6 ft.) for each additional elbow.
10.2 cm
(4 in.)
10.2 cm
(4 in.)
D673I 6.35 cm
(2-1/2 in.)
D802I