... quality and reasonable price 2.tight structure and small volume 3.Low noise&small vibration external rotor fan motor1. ... DeliveryPackaging Detail:FOAM BOXDelivery Detail:30DAYSSpecificationsTight structure and small volume,Wide range of speed adijustment,smooth starting&low current ... starting and low current starting and smooth speed adjustment.3,Low noise&small vibration4,High running reliability.5, ...