What are the two common types of springs used in garage doors?

The correct answer identifies the two common types of springs found in garage doors, which are torsion and extension springs. Torsion springs are typically mounted above the garage door and work by twisting to lift the door, providing a lifting force as the door opens. They are designed to handle the weight of the door and assist in its smooth operation. These springs are highly durable and are essential for heavy garage doors, making safety and efficiency a priority for mechanics and homeowners alike.

Extension springs, while not part of the selected answer, are another common type seen on garage doors. They operate by stretching, helping to counterbalance the weight of the door as it opens and closes. While the selected answer mentioned extension springs, it did not specifically name them as part of the correct pair.

It’s also worth noting that the other options mention types of springs not commonly associated with garage doors or incorrectly pair them. Compression springs are typically used in different mechanical applications rather than for lifting doors, while the single and double spring terminology does not specify the mechanisms appropriately used in the context of garage door functioning. Thus, the identification of torsion and extension springs provides clarity on the mechanisms that ensure the garage door operates safely and effectively.