... series external rotor motors are single or 3 phase,with permanent split capacitor,2,4 or 6 poles.The voltage of single phase motor is ... ,evaporators,exhaust fans,air heaters.The insulation class of motors is B.All motors have thermal protector in the winding.The service ... more than 40,000 hours.Most of external rotor motors have passed CE,ROHS,UL and approval.All our fan ...