Same specifications "Cooling Fan Manufacturer" products produced by each manufacturer has its quality and service life is different, mainly from differences in the structural design of each one, the electrical properties of the design, material selection and process control, etc. are different; followed users install the merits degree bit Ge selection and use of environmental conditions, such as integrated to decide, 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 can guarantee its quality and longevity so simple, user requirements and to their fans for the installation, use, environment, etc. to inform manufacturers, manufacturers to make a comprehensive assessment of its only the specification "Cooling Fan Manufacturer" selection, design and material selection, electrical properties, such as the structure of the conditions to achieve this requirement, otherwise everything will be impossible to achieve.