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20
Installation
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The exhaust air must be directed outside or to the
recirculation unit through appropriate ducts.
For further planning examples and notices, please see
the ventilation handbook (not included in the scope of
delivery).
Installing the additional fan
Install the additional fan in the exhaust duct.
Ensure that a minimum clearance of 300 cm is
maintained between the fan units.
Only use BORA universal fans with your BORA cooktop
extractor system.
Operating the cooktop extractor with a
fireplace that depends on the air in the room
INFO The state and regional laws and regulations
must be observed with regard to the exhaust
duct design. A sufficient air supply must be
ensured.
Fireplaces that depend on the air in the room (e.g. gas,
oil, wood or coal-fired heaters, continuous-flow water
heaters, instantaneous water heaters) draw in air from
the room in which they are installed and release the
exhaust fumes into the outside air via an exhaust system
(e.g. chimney).
If the cooktop extractor is used in exhaust mode, it draws
in air from the room in which it is installed as well as from
neighbouring rooms. If there is insufficient air supply, low
pressure will occur. Toxic gases could be drawn out of the
chimney or extraction ducting and back into the room.
Fig. 6.24 Exhaust air installation – not permitted
Fig. 6.25 Exhaust air installation – correct
6.5.4 Installation – standard set-up
1
2
3
4
5
6
7
Fig. 6.23 Standard set-up
[1] Cooktop extractor
[2] 90° diverter
[3] Horizontal tube bend
[4] Silencer
[5] Universal plinth fan
[6] Air duct/recirculation unit
[7] Universal control unit
Push the tube bend [3] onto the exhaust fitting of the
cooktop extractor [1].
Push the 90° diverter [2] onto the tube bend [3].
Position the plinth fan [5].
To facilitate positioning, the inlet nozzle on the plinth
fan can be removed. To do this, please see the assembly
instructions for the ULS25 universal plinth fan.
Connect the silencer [4] to the plinth fan [5].
Connect the silencer [4] to the 90° diverter [2].
Use the UDB25 sealing tape (not included in the scope
of delivery) to adhere together the connections for the
ducting sections with an air tight join.
You can also optimally adhere together the connections
between the ducting sections and the plinth fan with
UDB25 sealing tape.
INFO Position the plinth fan and the universal
control unit in such a way that they are easily
accessible and removable for maintenance
work.
The maximum exhaust air duct length with a fan is 6 m.
The minimum cross-section of the air ducts must
be 176 cm
2
, which equates to a round pipe with a
diameter of 150 mm.
For the ducting, only use stable duct elements with
smooth pipe interiors. Do not use flexible or fabric
tubes.
20


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