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en Installation and connection
16
3. Seal the opening in the back panel
with the cover.
Note: If there is a high level of
condensation in the exhaust air duct, it
is advisable to fix a condensation
collector (standard) or a drain hole with
a diameter of approximately 3 mm to
the lowest part of the exhaust air duct.
Exhaust air duct
All standard products can be used for
the exhaust air duct:
■ flexible pipes
■ galvanised metal ducts or pipes
■ connectors, adapters and diverters
for flat duct systems and pipe
systems
■ wall boxes for evaporation into the
open air or into a ventilation shaft
■ adapters on rectangular ducts
■ rectangular ducts or plastic pipes
■ back pressure flap
Note: The material must be heat
resistant up to 80 °C and moisture
resistant.
Pressure losses
Note: The type and length of the
exhaust air duct, particularly elbows or
bends with small radii, can impede the
air flow. Keep diameter reductions and
pressure losses (resistance) to a
minimum.
The following must be avoided:
■ long exhaust air ducts
■ exhaust air ducts with small
diameters
■ exhaust air ducts with many bends
and elbows.
Pressure losses through friction
Duct or pipe friction resistance, i.e.
friction on the inside of the exhaust air
duct, affects the air flow as follows:
■ the smoother the internal wall
■ the larger the diameter of the internal
wall
■ the shorter the pipe
the lower the friction resistance.
Pressure losses due to fixtures
The exhaust air encounters further
resistance through fixtures built into the
pipe, e.g. diverters (bends, elbows,
angles), wall boxes with grids or
backpressure flaps.
Installation for pipe connection
■ inside diameter = 100 mm
In order to ensure the minimum
required air flow, a certain pressure
loss (resistance) must not be
exceeded.
The permissible total pressure loss
in an exhaust air duct must not
exceed a certain value. This is
calculated as the sum of all
individual pressure loss values for
the straight pieces and fixtures in the
exhaust air duct.
Note: The value for the maximum
permissible total pressure loss for an
exhaust air duct is 50
*
.
■ inside diameter > 100 mm
If the pipe connection has an inside
diameter > 100 mm and total
pressure loss greater than 50*,
increase the inside diameter of the
pipe connection.
* To determine the total pressure loss
see table ~ "Individual pressure
loss values" on page 17
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