Description for the installer
Installation instructions
37
Exhaust pipe optimisation
Room air extracted on the direct route
Lead the room air extracted directly and via the
shortest route to the outside. Long routes create
additional, unwanted air resistance.
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Ensure that the exhaust pipe is directly fed outside
via the shortest route.
Use pipes with low air resistance
Only use tubes with a smooth surface on the inside.
Such pipes have a low air resistance.
Avoid the installation of:
§
Spiral hoses
§
Flexible tubes
§
Flat corner pieces.
These types of tubes have a higher air resistance and
reduce the performance of the extractor hood.
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Make sure that the exhaust pipe has a smooth
surface on the inside.
Only use bends with optimal air paths and a smooth
surface on the inside. These bends have low air
resistance (e.g. berbel bends).
Avoid using bends with sharp-edged air guides.
These bends have a high air resistance and produce
noises. These bends reduce the performance of the
extractor hood.
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Make sure that the bends in the exhaust pipe have a
smooth surface on the inside and that the air path is
optimised (e.g. berbel bends).
Use a suitable diameter
The minimum diameter for the exhaust pipe is the
DN 125 system (BEH 60/90 FL/FLT and BLB devices)
with 125 mm, and DN 150 system (all other berbel
extractor hoods) with 150 mm.
Every reduction in the exhaust hose causes unwanted
air resistance, performance reduction and noises.
Avoid:
§
Exhaust pipes of a smaller diameter.
§
Sharp-edged exhaust flat air ducts.
§
Conventional wall boxes.
These have a high air resistance and cause noises.
They reduce the performance of the extractor hood.
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Make sure that the minimum diameter of the exhaust
pipe is not less than the diameter of the fan outlet.
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Use berbel pipes, bends and the optimal berbel BMK
wall box, for example.
Exhaust pipe through an old chimney
DANGER
Suffocation risk from smoke or fumes.
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A master chimney sweep must
approve the use of the chimney as
an exhaust pipe prior to installing the
extractor hood.
DANGER
Fire hazard due to flammable exhaust
pipe.
Running a flammable exhaust pipe
through a second room or attic could
spread a fire into other rooms.
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Ensure that the exhaust pipe is
made of non-combustible material in
accordance with DIN 4102 class A1.
If you use a chimney as the exhaust pipe, you must
expect increased air resistance in relation to the length
of the chimney.
The extracted air must be introduced into the chimney
using a 90° bend pointing upwards. This will prevent a
possible back pressure.
