Specifications
The management of exhaust air and the choice of
components used for this are important factors in
order to achieve a fully functioning system.
The most commonly used air ducting materials are:
Folded spiral - seam pipe DIN 24145 – to be used if
intense re protection is required.
Flexible ducting DIN 24146 - non-ammable according
to DIN 4102 Class A1 heat – resistant up to 200 °C.
PVC coated fabric tube – temperature resistant from
-10 °C to +75 °C.
PPS pipe according to DIN 4102, low ammability.
When planning the exhaust air path the frictional
resistance must be kept as low as possible. The
smoother the path, the lower the frictional resistance
towards the steaming air.
Round channels are preferable to rectangular
channels. If for reasons of space at exhaust ducts must
be used, a minimum height of 90 mm is recommended.
Noise can be caused by the ow of the air in the ducts.
Solid and exible metal tubes and pipes and solid
plastic pipes can have disadvantages because their solid
bodies and hard surfaces carry noises more intensely
than fabric tubes.
The exhaust air path should not include any
unnecessary angles and bends. When using exible
tubes it must be ensured that the tubes are installed
fully extended in order to keep the frictional resistance
as low as possible.
Avoid reductions in the cross-section of the exhaust
path because this causes a performance reduction of
up to 30% and an increase in the airow speed which
will result in an increase in noise. If reductions in
the cross-section cannot be avoided they should be as
smooth as possible in order to avoid air turbulence and
increased counter pressure.
Tube clamps and pipe connection parts must be linked
in such a way that no leakage can occur from the air
stream.
EXHAUST AIR MANAGEMENT