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You take for granted that when you push that knob, that garage doors will open. They probably will, but why? You have a lot of options when it comes to the devices used to open your garage doors. Gone are the days of getting out of the car, grabbing a handle and pushing up this heavy door. Today, you have a lot of options and if you keep the in good working order, they make your life much easy. First of all, the invention of the electric motor opener was the greatest convenience ever when it comes to your Roll up Garage Door. This device is mounted to the ceiling and connected to it through a series of chains or belts. Using a pulley system, the motor activates the chain, belt or rod which moves the rollers either up or down along the tracks that run from the motor and along the sides of it.