The chain-drive system has a metal chain lifting the garage door up or down along a collection of tracks. The chain-drive system is the most typical as well as normally the most cost effective system.
In jackshaft kind, it is challenging to sense when someone is being squashed under the door. There are 2 sorts of electric motors readily available, AC and also DC. Air Conditioner is extra common however DC has several advantages. It eats much less power, the rate is easily managed and also earns less noise.