... Imported durable belt Energy saving Seven strict quality test Jienuo believe that Today the quality of ... 1000E diameter, 40inchJFD-900E diameter, 35inchJFD series standard fan(with hammer)JFD-1250HE diameter 50inchJFD-1000HE diameter 40inchJFD ... strictly quality test process: noise test, vibration test, concentric performance test, fan blade turning speed test, input air test and vehicle efficiency ...