CONTINENTAL EDISON CEHDDI9450VB9 Guide D'utilisation page 46

Installing the hood 46
Position the bottom chimney in the appliance, then
mark the holes on the wall.
Remove the lower chimney, then drill holes in the wall:
hole for screw diameter Φ8 mm
Use the dowels adapted to your wall
Install the lower chimney,
then screw it to the wall
with 2 screws of diameter
Φ 8 mm