A chain drive garage door opener is considered a 'classic' garage door opener. A trolley is pulled back and forth along a track, and a draw-bar connects the trolley to the door. Despite their low cost, chain drives are still found on heavy-duty operators because of their strength. As chain drive operators are noisy, they are best suited for detached garages.
A screw drive garage door opener is driven by a steel threaded rod. An electric motor moves the trolley and door attached to it with the help of the rod. This type of opener is popular because of its simplicity. Screw drive garage door openers are the easiest to maintain for DIYers.
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