"The doors, tracks and openers were installed in a few hours. They look great and add so much to our exterior as well as quiet and warmer in the garage. The technicians tweaked the pad installation as we needed. They were on time, professional and courteous. I give them 5 stars. My only ding on performance was filling up our rolling recycle bin with intact noses that we had to pull out and break down. I thought the boxes would have been hauled away."
The torsion springs on steel rolling doors work the same way as other torsion springs in the garage door industry. When the door is closed, the spring is wound. The spring is secured to a spring anchor bracket on one end and to the shaft on the other. When the steel rolling door opens, the spring in the barrel supports most of the door weight. The remainder of this weight is lifted by the chain hoist or the operator.