pin slot4 pin fans can run in 3 pin fan slots and will only go in one way since the header is keyed but will only run via voltage control. Most fans don't mind but have slhtly less range ofThe way to solve the Pin Slot puzzle and enter Jaheira’s Hideout is to place a Harp-shaped Pin in the empty Pin Slot. Where to find the Harp-shaped Pin in Baldur’s Gate 3? You can find it on