Air extraction mode
16
¾
Make sure that the outgoing air line has a smooth
inner surface.
Exclusively use bends with optimised air ducting
and a smooth inner surface. These bends offer low
air resistance.
Avoid the installation of bends with sharp-edged air
ducting.
These bends have high air resistance and generate
noises. These bends reduce the extractor hood's
output.
¾
Make sure that bends in the outgoing air line have
a smooth inner surface and that air ducting is
optimised.
Using the most favourable cross-section
The minimum outgoing air line cross-section is
125 mm in the case of 125 mm systems (BEH 60 N
and BEH 60 O) and 150 mm in the case of 150 mm
systems (all other berbel extractor hoods).
Each reduction of the outgoing air line generates
undesired air resistance, reduces output and
causes noises.
Avoid:
•
Outgoing air lines with small diameters
•
Sharp-edged flat outgoing air ducts
•
Conventional wall boxes
These have high air resistance and generate
noises. They reduce the extractor hood's output.
¾
Make sure that the outgoing air line's minimum
cross-section is not less than the cross-section of
the fan outlet.
Outgoing air line through the old chimney
DANGER
Danger of suffocation due to smoke or
exhaust gases.
¾
A master chimney sweep must
approve the chimney as an outgoing
air line prior to the installation of the
extractor hood.
DANGER
Fire hazard due to combustible
outgoing air line.
If combustible outgoing air lines are
routed through a second room or attic,
fire may spread to other rooms.
¾
Make sure that the outgoing air line
consists of non-combustible material
in accordance with
DIN 4102 Class A1.
If you use a chimney as an outgoing air line,
increased air resistance must be anticipated
depending on the length of the chimney.
The extracted air must be introduced into the
chimney using a bend which is bent upwards at an
angle of 90°. This avoids any possible back
pressure.