... service life; 3.Low noise,small power wastage rolling door opener:JD series of rolling shutters motors applied to shopping centers, warehouses, garages ... , theaters, hotels, banks, factories and other buildings, rolling shutter doors opening and closing, with electric and manual function ... .4912A13.8JD-1300-3P600130014014.4912A14JD-1500-3P800150016175.2912A14.5 rolling door opener