CIARRA CBCS6906D Manuel De L'utilisateur Et D'installation page 15

3) Align the air ventilation port of the cook hood with the cabinet
ventilation hole at the bottom, pass the power cord through the power
hole, and then use four 4 * 30mm screws to lock into the corresponding
position of the cabinet to fix the cook hood.
4) If there is a gap between the hood and the wall, you can install
the Back Bracket, as shown in the figure, use two 4*8 screws to fix the
back Bracket on the hood, and adjust the position of the back Bracket
to the wall according to the actual situation.
Installation
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EN