https://smallbusinesstips.us/the-basics-of-automatic-door-operators/
There are instances where a fully powered automated door operator may not be essential. The use of automatic door operators is common and many people do not even consider their function and operation whenever they come across them in everyday tasks.
Low-energy operators make slower, more delicate movements, which reduces chances of injury for their clients than automated operators with speedy motors to close or open doors. Systems like the ones used in conjunction with automated door operators, have been designed to be compliant with Americans with Disabilities Act (ADA) regulations and other code of conduct, which requires the doors of all public places to should be accessible for people handicapped.
The operator with low energy uses motion sensors or a an activation button that opens the door. Once the device has been activated, it opens the door. The door remains open for some time before closing the door.
meink6838s.