"220V AC Cooling Fan" take reasonable cooling measures to improve power efficiency, reduce the amount of use, the installation of the radiator, are some of the ways to improve the reliability of the power system are commonly forced air cooling. These methods on the module power output rating. If "220V AC Cooling Fan" Under normal circumstances, the derating curve from 50 ~ 70 ℃, then add some additional measures will make the derating curve to the right, that is, without derating temperature range will be wider . If "220V AC Cooling Fan" working conditions and standard components of a particular environmental stress the same conditions, taking into account the performance parameters of the components are showing some kind of non-linear distribution should also be used derating design techniques to achieve greater safety margin.