... 2.running out shell 3.low noise 4.stable operation 5.credible and safe FD-II 100 low noise double shaft outer rotor fan ... of motors are as following: fixed shaft, running out shell; low noise, stable operation .credible and safe, adjusting the speed stainlessly by ... joint with blade, which is better for thehorizontal double suction centrifugal fan and air-condition fan. The motor has been used ...