The backup power supply can be opened or lifted the shutter door when the power supply is cut off, to avoid some emergencies and higher safety factor.

https://ztfiredoor.com/10350.html

rolling shutter doors and windows,roll top shutter door,ac motor  rolling shutter door,rolling shutter door panel,rolling shutter doors and windows,garage rolling shutter door,rolling shutter sliding door,ac motor  rolling shutter door,aluminium rolling shutter door,garage rolling shutter door,fast electric rolling shutter door,rolling shutter doors and windows,aluminum profiles rolling shutter door,ac motor  rolling shutter door,steel rolling shutter door,garage rolling shutter door