... device 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 ... the good reputation and trust of customers. Aonuodi Exhaust Fan JFD-1250E for Greenhouse/Industrial/Poultry with CE certificate