Belt-drive openers are similar in design to chain-driven models, except a reinforced belt is what pushes or pulls the trolley. The belts may be made of fiberglass, polyurethane, or steel-reinforced rubber.
Pros: Belt-driven openers are just as reliable as chain-driven openers but quieter.
Cons: The negative for belt-driven openers is that they cost about $30 to $60 more than chain-driven units.
Chain-drive openers include a chain—similar to a bicycle chain—that pushes or pulls a trolley (carriage) that connects to a metal bar, called a J-arm, that is affixed to the garage door.
Be Aware: If your garage is situated under a bedroom, the noise generated by metal-to-metal contact and vibration may be a nuisance. If the garage is detached, it probably isn’t. Newer chain-driven units with DC motors and soft start-and-stop technology are significantly quieter than older units.
Jackshaft openers, unlike the other systems, mount on the wall beside the garage door. A 24-v DC motor drives pulleys and cables that turn the torsion bar and raise the garage door. When the motor is reversed, cable tension is loosened and the door lowers.
Pros: This system is reliable and quiet. In addition, it keeps the ceiling free for overhead storage and is well-suited to garages with high or low ceilings.
Cons: Jackshaft openers are more expensive than most other types of openers.
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