Air extraction mode
17
Make sure that
•
the slats of the louvered cover of the wall box are
not narrow and thick
•
the slats of the louvered cover of the wall box are
not positioned sharply downwards.
•
no insect screen is installed in the wall box. Insect
screens impair the cross-section of the outgoing
air line completely.
¾
Use only flow-optimised wall boxes (e.g. BMK-
F/L).
