... ventilation fan were tested by ministry of agriculture ,China ,which have big wind volume. pressure exhaust fan /exhaust fan /cone fan JFD-125HE series exhaust fan ... process: noise test, vibration test, concen- tric performance test, fan blade turning speed test, input air test and vehicle efficiency ... 75380≤64350001100*1100*45074JFD-100HE10005600.75380≤64350001100*1100*41065 Industry ventilation fan