Same specifications "Cooling Fan Manufacturer" 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; the second is the merits of the user's degree of installation location selection and use of environmental conditions, such as integrated to determine, in order to achieve the desired quality and service life requirements, users in the selection of "Cooling Fan Manufacturer" sometimes is not to provide a set of data out by the manufacturer on the can guarantee its quality and life so simple, user requirements and to their fans for the installation, use, and environment to inform the manufacturer, the manufacturer of its specifications for a comprehensive assessment before the "Cooling Fan Manufacturer" structure selection, design and material selection, electrical properties and other requirements to achieve this condition, otherwise everything will be impossible to achieve.