The same specifications "Cooling Fan Manufacturer" products produced by each manufacturer has a different life of its quality and, mainly from differences in the structural design of each one, the electrical properties of the design, material selection and process control, etc. are different; the second is to use the merits of the degree's installation bit Ge selection and use of environmental and other conditions General to decide, in order to achieve "Cooling Fan Manufacturer" ideal quality and service life requirements of the user in the selection of the fan sometimes does not depend on the manufacturer to provide a set of data out can guarantee its quality and longevity so simple, user requirements and to own the "Cooling Fan Manufacturer" installation, use, environment and other informed manufacturers, manufacturers make a comprehensive assessment of its size before the fan selection, design and material selection, electrical properties and other structures to achieve this condition requires otherwise everything will be impossible to achieve.