What is the difference between manual, chain hoist, and electrical doors?
The difference of these doors is the way it is operated in an open and close cycle. The manual doors are operated by pulling the door and providing momentum by physical force. This type of operation is used for doors of small area (ft2). On the other hand, the chain hoist doors are operated manually but different from the manual doors in that they have a mechanism that reduces the weight, making it easier to complete a cycle by just pulling on a chain instead of building momentum. This type of mechanism is recommended for doors of medium to big area (ft2). Lastly, we have the electrically operated doors. These doors are operated by an electro mechanic operator which does the work of a chain hoist electrically. This last one operates on a signal provided by a key switch, a button station, transmitters, and/or numerical code.
