I used these due to the short Noctua fan cables and to avoid modifying the fan cables themselves in case I want to reuse the fans later. Any 3-pin or 4-pin fan should work if you’re going for the 100% fan speed hack. I take no responsibility if this destroys your switch, burns your house down and/or electrocutes you. If you have more beefy fans available, you can avoid this little hack and just drop-in replace the original fans. As my quiet replacement fans aren’t as beefy and would not provide enough airflow at these low RPMs, I’ve connected them directly to the PSU PCB 12V output to always run them at 100% (which is upstream of the original fan headers, so it should be completely fine).
It uses two beefy 40mm fans with standard 3-pin fan pinout, running at pretty low RPMs at idle. I’m not sure if I would mod the PoE versions due to higher power dissipation, so I’ll disregard PoE versions in this small guide. It’s power usage isn’t too bad and its fans aren’t super noisy, but it can get even quieter.
Juniper EX3300 is an 元 switch with 24/48 Gigabit ports, 4 SFP+ ports and optional PoE.
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