See my improved model here:
https://www.printables.com/de/model/962260-biqu-h2-extruder-adapter-optional-on-linear-rails
Caution, it seems similar, but its incompatible.
Just an easy, one side only Fanduct for my modular H2 Extruder Backplate
Be aware, bridging is good at 40-50% fan speed (with sunon maglev) and get worse at higher speeds with this model.
Update
V1.1
Includes
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The author marked this model as their own original creation. Imported from Thingiverse.