How did the power off the power off?
In fact, the common electric door generally have two! One is the electric sensor door (sub-open and translational type), this door after the power outage only need to push to open! There is also a curtain, electric device at the top of the door, usually after the decoration is invisible, only one chain outside the ceiling. After the power outage need to manually move in a direction to slowly open the chain! The The Not common in the use of financial units, with access control. Need to password or fingerprint identification system to open, power outages are generally open, unless it is to use high-tech crack or man-made damage Caixing!
There is a clutch in the motor to pull the clutch up and the same as the ordinary door
