The fan placement is a little weird. Axial fan(?) from closed panel to open area at the ATX connections? Air channel to the closed AC wire side?
If you look at the photos, there are arrows on the fan indicating airflow. It pulls air from the connectors towards the opposite end with the power input. The AC wire side has slots now.
Also, I agree the 200mm length is limiting. It no longer fits vertically in many cases....