Just found this guide, It should clear up many questions: https://forum.prusaprinters.org/wp-content/uploads/wpforo/default_attachments/1596858738-ZMK3s-Duet2W.pdf

Posts made by citybird
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RE: Duet 2 WiFi - connecting 3 wire 5v fans [solved]
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RE: Duet 2 WiFi - connecting 3 wire 5v fans [solved]
@Veti said in Duet 2 WiFi - connecting 3 wire 5v fans:
Or you can leave it not connected.
Thanks Veti, I wasn't sure if these instructions were for 4 wire fans only and I missed that last sentence completely.
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Duet 2 WiFi - connecting 3 wire 5v fans [solved]
Hi, what is the recommendation for using 3 wire fans with the Duet 2 WiFi board?
I have a Sunon Maglev MF40100v2-1000C-G99 fan that takes DC5volts and 0.65wats. It has 3 wires.