For printing orientation please see pictures there is no need for any supports. After the print you will need to saw the long gap (see pictures). The gap in the fan duct need to be closed with a small piece of Kapton tape after it is mounted.
The fan duct will be mounted from the backside BEFORE you mount the hotend! You will need these screws:
2x M3x8mm for mounting to the carriage
4x M3x16 for mounbting the 40x40x10mm fan (may be vary if fan is bigger).