How do garage doors work ? Automatic garage door, which is basically supported by a motor or opener, is something used by so many people in many parts of the world. Maybe, you are also included in one of them. Even if it is so, do you know about how do garage doors work? Or have you ever think about this in your mind? The most common thing happens is that users of automatic garage door like this only know about how to hire people to install the door and how to use it without really know about how actually the doors work. Just in case that you are curious about the way of work of the doors, here is a brief explanation can be given to you. The main topic we are going to talk about in this case is nothing else but two different types of mechanism, which are nothing else but the main parts to support the work of the door. Those mechanism types are none other but torsion spring mechanism system and extension spring mechanism system.