ADDA Transformer Cooling Fan Specification Bearing type: Ball bearing Voltage:12/24/48V Certification:CE UL TUV ADDA Solar Cooling Fan Detailed Specification 1Frame size(mm)120X120X252Bearing typeball bearing3Rated voltage12V,24V,48V4Rated speed2900~4000RPM5Max air flow175.8CFM6maxiam pressure:12.7mmAq7Maxiam noise58.6dBA8Functionsby IC,by IC with FG, PWM,PWM+FG9safety approvalsCE,TUV,UL, ...