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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). Lon-
ger 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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