Upon removing the dash facia panel which includes the front face vent, I noticed behind a black shaped vertical duct directly behind.
This duct is not fitted properly to the top of the heater box, but is does not seem to come out or move in place properly.


What is holding this duct from coming out, so I can inspect it ?

I have looked at the manual that shows the unit, but it does not show how it is fixed.

Paul.