Siemens DKE 64.K Operating And Installation Instructions page 23

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.
Attaching the one-way flap:
Insert the two lugs on the one-way flap
into the holes on the air-pipe connector
or air outlet and lock into position.
Before installing the one-way flap,
ensure that the lettering or stamp is on the
outside.
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 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.
The manufacturer of the
extractor hoods accepts no liability
for complaints which can be
attributed to the design and layout of
the pipework.
Round pipes:
We recommend
Internal diameter: 150 mm.
Flat ducts must have an internal cross-
section that equates to that of round
pipes.
There should be no sharp bends.
l 150 mm approx. 177 cm
If pipes have different diameters:
Insert sealing strip.
For exhaust-air mode, ensure that
there is an adequate supply of fresh air.
Pipe connection
Screw the
enclosed air-pipe
connector over
the air outlet.
150 mm l extraction pipe:
Attach the exhaust-air pipe directly to
the air outlet.
If a one-way flap has been fitted,
conduct a performance test.
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