exhaust fan/ventilation fan/cooling fan BIG WIND VOLUME LOW COST, LOW NOISE, TEST BY MINISTRY AGRICULTURE OF CHINA exhaust fan/ventilation fan/cooling fan1.The ... process: noise test, vibration test,concen- tric performance test, fan blade turning speed test, input air test .Spec.The dia ... 64350001100*1100*45074JFD-100HE10005600.75380≤64350001100*1100*41065 exhaust fan/ventilation fan/cooling fan