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Calculate the effective duct
length
The overall duct length will determine
the duct diameter.
^
Measure the actual duct length
needed:
1. Establish the number of elbows or
bends necessary, noting the type of
bend, angle and radius involved
(see, Table 1).
2. Add the additional duct length as
specified in Table 1 to the actual
duct length to get the effective duct
length.
3. The necessary duct diameter can
then be found in Table 2.
Note:
Drying times and energy consumption
remain unaltered for 4" (100 mm) duct
up to a total length of 66 ft. (20 m).
Longer ducts may lead to slight
increases, but, the function will not be
impaired as long as the necessary duct
diameter is used (Table 2).
Table 1
Type
of bend
Angle Radius Additional
duct length
inch cm inch cm
Flexible
metal duct
90 °
45 °
up to
16"
up to
16"
40.6
40.6
20"
12"
50.8
30.5
Smooth
metal duct
90 ° 4" 10 14" 35.6
Elbow 90°
sharp;
no radius
90 ° 90" 228.5
Concertina
bend
90 ° 8" 20.3 28" 71.1
Wall vent kit
with louvres
or
window
vent kit
142" 360.7
Wall vent kit
with flap or
window
vent kit
99" 251.5
Exhaust
connection
left side
193" 490.2
Table 2
Internal diameter or
edge length
Effective duct
length
inches mm ft m
4"
5"
6"
100
125
150
0 - 66
66 - 100
100 - 140
0 - 20
20 - 30
30 - 42.7
INSTALLATION INSTRUCTIONS
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