Fan-Y-adapter cable

That you need, whenever you need to connect more fans, as slots are available on the board. Did not know that already there is such a thing, or I would have to solder it together myself.
Also interesting is the 2-wire and 3-wire connection option, as only a speed contact on this port can be evaluated by the board, you have to worry about which of the two you want to regulate fan. Perhaps ventilation would be in smaller handout Zkizze and proposal for a Einsaug- outlet useful in the visible which fan should be regulated?