This design is heavily inspired by the "Extruder Cover X1 / X2 / Genius + ABL + Fan Mod" from "Just-Printed_3D" (https://www.thingiverse.com/thing:4799645). I took some measurements from his .step file and made my own version for my Genius Pro with an 5015 radial fan.
I used the flat cable protector from his files and even made the fitment for the airduct the same to be able to use his "Herberts_Mod_Bauteillüfter_V5.stl" which fits perfectly. (I printed it vertically with custom supports for the upper part.
Get the "Herberts_Mod_Bauteillüfter_V5.stl" and "STL_Flat_Cable_Protector_11-2021.STL" from "just printed".
NOTES:
The author marked this model as their own original creation.