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

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RE: Duet 2 WiFi - connecting 3 wire 5v fans [solved]
Just found this guide, It should clear up many questions: https://forum.prusaprinters.org/wp-content/uploads/wpforo/default_attachments/1596858738-ZMK3s-Duet2W.pdf