CIARRA CBCS6102 Mode D'emploi page 14

Installation
9) Use a Spirit Level Ruler to measure whether the hood is in a horizontal
level, and use two 4*30mm Screws to lock into the safety hole
position of the hood (not mandatory, according to user's wishes to
choose whether to lock).
COMPONENTS:
Part 2: 4*30mm Screws X 2
EN
10) Tear off the tape from the air outlet.
NOTE:
 Make sure you remove the tape on the damper and check if the
damper opens and closes freely, otherwise it make noises, and
the cooker hood will be shaking.
4*30mm
Screws 2pcs
12
Spirit Level Ruler
Tape