I used 120mm fans in my previous build, worked fine. However the enthusiasts seem to have moved to 140mm. Fits all the normal size cases and moves either more

I used 120mm fans in my previous build, worked fine. However the enthusiasts seem to have moved to 140mm. Fits all the normal size cases and moves either more air for the same RPM, or the same air at less rpm. My favorite thing about them is the pitch of the hum is just a bit lower.