"Cooling Fan Manufacturer" noise ratio is a very important parameter, unlike other such life, anti-interference ability of these needs a long time before the data to show up, the size of the noise can indeed about the customer's choice. Many "Cooling Fan Manufacturer" manufacturers also noise aspects of technological breakthroughs, the force of higher performance, lower noise. Source Technology Wind in this area has a very strong rate. Product performance, the noise ratio is marked as dba, defined as when the cooling fan running at normal speed fan generated sound size. In fact, the mass point, the size of the noise to a large extent depends on the impact of "Cooling Fan Manufacturer" apparatus. If you are too close to the cooling fan is installed outside, such as at the entrance, then abnormal air flow, the size of the sound will have a significant impact.