Cut two circular holes in the vertical upstand.
Recommended distance between the holes and
The floor is 50-150 mm.
Fit the frame so it cover the holes.
Fit the front panel to the frame.

Airflow adjustment to be carried out with an external damper.(Not incl.)
The unit and ductwork can be cleaned internally by removing the unit front panel.

Clean with water and a mild detergent solution.