"220V AC Cooling Fan" heat component is determined by its power, it should be used in the design of the first small-power components, minimizing heat. Second set of components operating point, the general should choose its rated operating range, while working within this range good performance, low power consumption, the longest life expectancy. "220V AC Cooling Fan" category on the device itself, a large amount of heat, try to avoid working at full capacity design. For high-power devices should implement the principle of derating design, design appropriate to increase the degree of affluence, which is both for "220V AC Cooling Fan" to increase system stability, reliability, and reduce the heat as a whole.