To be mounted in a corner hanging on a wall.
Remove the front panel.
Fit the unit vertically to the wall and fix it with screws,
through the backplate.
Refit the front panel.

Use a measuring damper MLC or another externally filted
damper for air flow adjustment.
The unit and duct system can be cleaned internally by
removing the unit from the ductwork.

Clean with water and a mild detergent solution.