CDA EVX90SS Use And Maintenance page 9

Locate the extractor in the ceiling opening, make sure to connect your
ducting and mains electrical connection before proceeding to the next
step
Fig. 7
Fix the extractor to the bracket with the 6 screws and washers provided.
Tighten evenly on both sides until secure, be careful to not overtighten
Fig. 8
Instruction Manual | 9