Another commonly used counterbalance system for roll-up garage doors is what type of spring?

A torsion spring is a type of spring that is designed to store and release rotational energy. In the context of roll-up garage doors, torsion springs are mounted horizontally above the door and are crucial for counterbalancing the weight of the door. When the door is closed, the spring is wound tightly, storing energy. As the door is opened, the energy stored in the torsion spring helps to lift the door, making it easier for the user to operate. This system allows for smooth and controlled movement, significantly reducing the effort required to lift the heavy door.

In contrast, compression springs are designed to resist axial compressive forces and are not practical for a vertical door lifting application. Leaf springs, although they can bear loads, are generally used in situations where bending is involved, not suitable for the rotational mechanism needed for garage doors. Gas springs operate through gas pressure and are typically used for applications requiring a gentle lifting force rather than the heavy lifting required by garage doors.