Operating instructions

The shorter the exhaust ductwork, the
more efficient the dryer will run. Ex-
pelled air is slowed down in the ducts
due to friction against the inner walls.
The shorter and smoother the inner
walls are, the less friction will be cre-
ated.
An elbow or bend creates more friction
than a straight duct. An Additional Duct
Length Factor must therefore be added
for each elbow or bend used (see
Table I). This factor expresses the re-
sistance of the bend in terms of a
length of straight duct.
The Additional Duct Length Factor is
then added to the actual duct length to
give the Effective Duct Length.
A larger diameter duct also helps to re-
duce friction. Duct diameter should
therefore be increased for longer duct
runs.
To calculate the Effective Duct Length.
Measure the actual straight duct
length needed.
Establish the number of elbows or
bends necessary, noting the type of
bend, angle and radius involved.
(see Table I).
Add the Addiditional Duct Length as
specified in Table I to the actual duct
length to get the Effective Duct
Length.
The necessary duct diameter can
then be found in Table II.
Note:
Drying times and energy consumption
remain unaltered for 4’’ duct up to a
total length of 26’.
Longer ducts may lead to slight in-
creases in drying times and energy
consumption but will not impair the
function of the machine as long as the
necessary duct diameter is used (see
Table II).
Tabel I
Type of bend Angle Radius in inches Additional duct
length in inches
Flexible metal duct 90°
45°
up to 16’’
up to 16’’
20’’
12’’
Smooth metal duct 90° 4’’ 14’’
Elbow 90° sharp; no radius 90° 90’’
Concertina bend 90° 8’’ 28’’
Wall vent kit with louvres, or window vent kit
Wall vent kit with flap, or window vent kit
142’’
99’’
Exhaust connection, left side 193’’
INSTALLATION INSTRUCTIONS
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