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How to calculate the effective
duct length
The overall duct length will determine
the duct diameter (see the "Additional
duct lengths" table). In Canada the
exhaust duct must be 4" (102 mm) in
diameter.
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Measure the actual duct length
needed to go from the dryer’s
exhaust connection to the vent outlet:
1. Establish the number of elbows or
bends necessary, noting the type of
bend, angle and radius involved
(see the "Additional duct lengths"
table).
2. Add the additional duct length (as
derived by using the values
specified in the "Additional duct
lengths" table) to the actual duct
length to get the effective length.
Note:
Maximum effective duct lengths:
4" (100 mm) diameter 66 ft (20 m)
5" (125 mm) diameter 131 ft (40 m)
6" (150 mm) diameter 328 ft (100 m)
If using flexible metal duct the total
length must not exceed 7' 10" (2.4 m).
See the "Additional duct lengths"
table for more information on
maximum duct lengths and number
of bends.
Effective duct lengths over 66 ft (20 m)
require a larger duct diameter.
Longer ducts may lead to decreases in
dryer efficiency if the next larger duct
diameter is not followed.
Ducting
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