I just downloaded smcfanControl today for my MacBook Air. I did it for one reason...flash video. I just like the idea of being able to control the fan speed sooner before flash warms the machine up and the fan has to pick it up a notch just to try to cool it down. So the reason for the download was definitely more for a preventive reason. But my question is while the app is running the default is set at 2000rpm...so the fan is always running at this speed while in default...without this app is the fan always on running at least 2000rpm or is the fan completely off when the machine is cooled down enough...taking a break? The reason for asking is because I don't want to have to always run the fan...if it doesn't have to be ran.