This is a remix of Kevin Coopers stock 5015 single fan model. The shroud and bracket are required to mount it, and then wiring piece is optional if you want some cable management and also have a spot for a tiny buck converter for non 24v fans (front or rear ones): https://www.amazon.com/gp/product/B01MQGMOKI/
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v2: fixed a small gap that showed up in some slicers
v3: reworked the inlet to duct transition, much smoother flow now
The author remixed this model.