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There are centrifugal fans that are quite flat but they intake airflow from a different axis they exhaust it from. Could still work
Hmm I’ve gotta look into that, It’s Dell Poweredge R410 Server: looks like this: https://i.ebayimg.com/images/g/er4AAOSwNDVfyTuN/s-l1600.jpg.
It would need to fit inbetween two heat sinks pretty snug.