Bosch DHI 635 H Operating And Installation Manual page 11

Prior to installation
For operating in exhaust-air mode, a
one-way flap should be mounted inside the
extractor hood unless there is already one
fitted in the outlet duct or wall ventilation
box.
If no one-way flap was enclosed with the
hood, it can be obtained from a specialist
retailer (see section on optional accessories
in the user instructions).
Installing the one-way flap:
1. Cut out the protective grid in the air-pipe
connector.
2. Insert the one-way flap into the bearing
apertures on the air-pipe connector.
If the exhaust air is going to be
discharged into the open, a telescopic
wall box should be fitted into the outside
wall.
For optimum extractor hood efficiency:
Short, smooth air exhaust pipe.
As few bends in the pipe as possible.
Diameter of pipe to be as large as
possible (ideal is l 120 mm ) and no
tight bends in pipe.
If long, rough exhaust-air pipes,
many pipe bends or smaller pipe
diameters are used, the air extraction
rate will no longer be at an optimum
level and there will be an increase in
noise.
Round pipes:
We recommend
Internal diameter at least. 120 mm.
Flact ducts must have an internal
cross-section that equates to that of
round pipes with a 100/120 mm internal
diameter
There should be no sharp bends.
l 100 mm approx. 078 cm
l 120 mm approx. 113 cm
If pipes have different diameters:
Insert sealing strip.
For exhaust-air mode, ensure that
there is an adequate supply of fresh air.
Exhaust air flows upwards:
Cut a hole in the top of the wall cupbo-
ard, including a groove for the mains
cable.
O
– Template lis enclosed –.
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80
115
mind. 30
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2
120
90
250
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