... never drop6 imported bearing with long serviceventilator fanYWF series external rotor motors are single or 3 phase,with permanent split capacitor,2 ... ,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 ...