Same specifications "220V AC Cooling Fan" product produced by each manufacturer and its quality has a different life, mainly from differences in each one of the structural design, electrical performance design, material selection and manufacturing process control, etc. are different; secondly that is, the extent of the merits of "220V AC Cooling Fan" user installation location selection and use of environmental conditions, such as integrated to determine, in order to achieve the desired quality and service life requirements, the user sometimes does not depend on the choice of fan manufacturers to provide a set of data out on it to ensure its quality and longevity so simple, user requirements and to own the "220V AC Cooling Fan" installation, use, and environment to inform manufacturers, manufacturers make a comprehensive assessment of its fishes selection, design and electrical properties of materials used in the specification, such as the fan structure to achieve this condition requires, otherwise everything will be impossible to achieve.