The same specifications of "Micro 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 process control, etc. are different; second is pros and cons of user level installation location selection and use of environmental conditions such as integrated to decide. To achieve the desired quality and service life requirements, users in the selection of "Micro Cooling Fan" sometimes not to provide a set of data out by the manufacturer can guarantee the quality and life is so simple, user to their own requirements and the fan installation, use, and environment to inform the manufacturer, the manufacturer of its specifications for a comprehensive assessment before the "Micro Cooling Fan" selection, electrical performance design and material selection and other structures to achieve this condition requires, or else will not be realized.