Push the exhaust and plenum box together and fixate them in desired position with screw/pop-nut through holes inside the plenum box.

Mount the unit in the false ceilings T-profile. Use pendulum or clamp. Holes for this are located in the plenum box.

Calculate which k-factor that would be needed to give the stated air flow for the selected units. This makes the following commissioning easier.

Mount the front.
The plate is rotatable in steps of 90º.

When the front is mounted in place it forms a flat surfaces with the ceiling.