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Different pores and skin garage entry doors. Basically, the doors are put into 3 acquiring chain system - screw-drive system, chain drive system and computer controlled set up. The screw drive system uses a Heavy Lifting chains mechanism which moves the time of a steel rod and it is attached to your garage roof. The most common and affordable system may be the chain drive system. Just as the name implies, it is constructed out of a chain that moves the door along a number of tracks , and it's very noisy every time you open or close the garage door. For the computer drive mechanism, much more use with regards to a computer-controlled system which is attached across the door. It is quiet and efficient. |