Siemens LC 99 Serie Mode D'emploi Et Notice De Montage page 30

Installation
11. Connect the pipes.
12. Connect the power.
13. Carefully remove the protective foil.
14. Place the two sections of the upper flue
on the extractor hood and clip together.
Protect the extractor hood from
damage.
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15. Push up the upper flue section and
screw into position.
16. Insert the two sections of the lower flue
and clip together.
Protect the extractor hood from
damage.