I've just upgraded my PC and realised that there is no case fan! There is a bracket on the front inside of the case about half way down. How do I know if I need a 80mm or 120mm fan? Also, as there is only one bracket in the whole case, would the fan be blowing air out or sucking it in?
There should be holes in the back of the case for a fan also. If it's in the front, usually it's blowing in. Measure diagonally from the mounting holes. 80mm is about 3 1/2 inches while 120mm is 4 inches.
