... outside motors chain drive system motor Used for industrial roller door ,garage door,commerical door ,storage door opener Outside MotorAccessories for industrial roller door :Chain motor is ... It is mainly used for professional doors,large factory doors,garage doors and so on.Models:220V AC, 50Hz: 300 ... , 1300-3P, 1500-3P and 2000-3P Chain drive system outside motor,Garage door motor ,Roller door motor