how does this come come off please

[pug306driver]

Thanks for the reply. The plastic styrip clip thing comes off from the upper position quite easily but the dusting seems to be well held in place. Will have another "feel" underneath it for some more clips. There seems to be some "feet" under the ducting more towards the open end sitting into/fitting into some "holes" ......but they are free and that end lifts up easily.

Any idea what that round wiring connection connects to please ??