The Fan Ducting is used with the hotend shroud and induction sensor mount to convert a Creality type print head to a direct drive printhead using the Zesty Nimble.
The other parts needed are:
The Nimble Extruder
With an installed weight of less than 27 grams on your carriage/effector the Zesty Nimble is smallest and lightest extruder you can buy, it has ample torque and can be mounted in multiple orientations.
The Nimble is available from Zesty Technology.