... Provide 7*24 hours on-line service.Technology parameters Fan specificationsBlade Diameter mmFan speed r / mInput power kwCurrent ... process: noise test, vibration test, concentric performance test, fan blade turning speed test, input air test and vehicle efficiency ... in Beijing, Shanghai, Guangdong, Yunnan, Liaoning, Hunan, Hebe, Jiangsu, Zhejiang, and so on, more than twenty provinces and cities ...