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Installation
510975
36
Exhaust System
IMPORTANT: Keep exhaust duct as short as
possible.
NOTE: Be certain old ducts are cleaned before
installing your new dryer unit.
For best drying results, recommended maximum
length of exhaust system is shown in Table 2.
To prevent backdraft when dryer unit 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 in areas where heavy
snowfall can occur.
Number of
90° Elbows
Weather Hood Type
Recommended Use Only for Short Run Installations
Maximum length of 4" (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" (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.
Table 2
4"
(10.2 cm)
4"
(10.2 cm)
D673I
2-1/2"
(6.35 cm)
D802I