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No additional setup, just plugged the fan into the 5v and ground pins on the GPIO headers. You can find fans on ebay / whatever with plugs already on them to fit the pi but I just used a 5v fan from my local electronics store and put my own plug on it.

see here for a reference of which are the 5v and ground pins

https://www.element14.com/community/servlet/JiveServlet/previewBody/73950-102-10-339300/pi3_gpio.png