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Ya lots of these are intended for racks where noise doesn't matter so jet-turbine noise is fine.
Putting in quieter fans almost certainly reduces airflow. That's why I added this 120mm instead of swapping out the 40mm fans.
A noctua 40mm will...
This PoE switch had two mega noisy fans in it.
I decided to give up 1U for this upgrade. I wish I had done it a long time ago....
Drilled a corresponding hole in the case and just plugged this fan right into where the old fan was.