Miele Novotronic T 510 Operating Instructions Manual page 25

The shortest passage for the expelled
air is preferable, to ensure the tumble
dryer functions most efficiently. Ex-
pelled air is slowed down in the vent
duct due to friction against the inner
walls of the duct. The shorter the duct
and the smoother the inner walls, the
less friction occurs.
Additional duct length
An elbow or bend creates more friction
than a straight duct. An additional duct
length factor should therefore be calcu-
lated for each elbow or bend (see
Table I). This factor expresses the re-
sistance of the bend in terms of a
straight length of duct.
Effective duct length
The additional length factor is then
added to the actual duct length to give
the effective duct length.
Duct diameter
A larger duct diameter also helps to re-
duce friction. The duct diameter
should therefore increase with increas-
ing duct length.
Table I
Type of bend
Flexible piping
Plain piping
Plastic piping
Stove piping
Elbow
Concertina bend
Wall vent kit with grille or window vent kit
Wall vent kit with flap or window vent kit
Exhaust connection left/right
Flat section adapter
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Angle
Installation - venting
To calculate the effective duct
length:
Measure the actual duct length:
– Establish the number of elbows or
bends necessary, noting the type of
bend, angle and radius involved
(Table I).
– Add the additional length factor as
specified in Table I to the actual duct
length to give the effective duct
length.
– The appropriate duct diameter can
then be taken from Table II.
Note:
Drying times and energy consumption
remain unaltered for 100 mm dia. duct-
ing up to a total duct length of 10 m.
Longer ducting may lead to slight in-
creases in drying times and energy
consumption but does not impair the
function of the machine if the necess-
ary duct diameter is adhered to (Table
II).
Radius
in mm
90° 100 – 500
45° 100 – 500
90° 100
90° 200
45° 100
90° 200
Additional
pipe length in m
0.5
0.4
0.4
0.3
0.3
2.5
0.8
3.8
1.5
6.0/10.0
18.0
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