... device Provide 7*24 hours on-line service.Technology parameters Fan specificationsBlade Diameter mmFan speed r / mInput power kwCurrent AAir ... close, windproof, rainproof and dustproof 5. Newly punch forming fan blade, reasonable angel and reach the max.air flow, ... test process: noise test, vibration test, concentric performance test, fan blade turning speed test, input air test and vehicle efficiency ...