Vasco DX4 Manuel D'installation Et D'utilisation page 100

Step 2:
Attach the mounting brackets to the unit and glue the bumpers to the
back of the unit.
Step 3:
Place the ventilation unit against the wall by lifting the bracket
of the ventilation unit onto the wall bracket.
HORIZONTALLY WALL MOUNTING
Mount the ventilation unit on a wall of sufficient strength.
Place the ventilation unit at an angle of 3° to ensure proper condensate
drainage, with the condensate drain located at the lowest point.
Ensure sufficient distance in front of the unit to perform necessary
maintenance work.
14 HORIZONTALLY WALL MOUNTING