Counterbalance springs are how your door is actually lifted and shut. It's not the opener that in reality lifts and shuts your door. That only supplies the push to actually get the door moving. Its actually the springs, which are wound tightly when your door is closed. Since the doorway moves up, the springs unwind, which deliver the force needed to lift the doorway. Since the door closes, the excess weight with the door in reality winds the springs back up until eventually it closes completely. At this stage the springs have their total tension once more. These springs are commonly exposed and when they are under total tension, will be immensely harmful.
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