Webasto Air Top 2000 S-B Notice De Montage page 59

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Air Top 2000 S Combustion air supply
9 Combustion air supply
Under no circumstances may the combustion air be taken from areas
occupied by people. The combustion air intake opening must not point
in the direction of travel. It must be located so that it cannot become
clogged with dirt.
NOTE: For petrol heaters only.
The combustion air must be extracted using a combustion air line
(if necessary) from a position that is as cool as possible and protected
from splashing water.
If the heater is in a sealed installation box, the combustion air must be
drawn in from the outside and the emissions fed to the outside. Pipe
passage holes must be made in such a way as to ensure that the ingress
of exhaust fumes into the interior of the vehicle should not occur.
See the statutory regulations for the installation for further regulations.
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