Siemens LC 99 Serie Mode D'emploi Et Notice De Montage page 26

Prior to installation
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.
Round pipes:
We recommend
Internal diameter: 150 mm (at least
120 mm).
Flat ducts must have an internal cross-
section that equates to that of round
pipes.
There should be no sharp bends.
l 120 mm approx. 113 cm
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.
Circulating-air mode
With activated carbon filter if exhaust-air
mode is not possible.
The complete
installation set can be
obtained from
specialist outlets.
The corresponding
accessory numbers
can be found at the
end of these operating
instructions.
26
Connecting a l 150 mm exhaust-air
pipe:
Connecting a l 120 mm exhaust-air
pipe:
2
2
Mount the pipe directly onto the air
outlet on the hood.
Attach the reducing connector directly
to the air pipe.
Attach the exhaust-air pipe to the
reducing connector.