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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 unit.
For best drying results, recommended maximum
length of exhaust system is shown in Table 1.
To prevent backdraft when 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
305 mm (12 inches) 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 102 mm (4 in.) diameter rigid metal duct
0 19.8 m (65 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 102 mm (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.
Table 1
102 mm
(4 in.)
102 mm
(4 in.)
D673I
64 mm
(2-1/2 in.)
D802I