Some things to note:
- The only OS currently available is Rasparian
- Ubuntu Mate is being worked but no time line is given.
Below is a series of pictures of the Pi4 with a Pimoroni case and cooling fan in place.
In the above pics it appears as though the fan is somehow screwed/bolted to the Pi 4 board. It is not. In the pic below you will note that the fan is entirely held in place by sliding onto the 40 pin header. The bolts mount the fan to a “U” shaped circuit board under the fan which in turn hold the control logic and allows the fan to mount to the 40 pin header.