There are several different parts to a door, and it is important to understand the functions of each one. The parts of a door include: The frame – The frame is the structure that supports the panels of the door. It is usually made from steel or aluminum. The panels – The panels are the sections of the door that open and close. They can be made from a variety of materials, including wood, fiberglass, or steel. The springs – The springs are what help to open and close the door. There are two types of springs – torsion springs and extension springs. Torsion springs are located above the door, while extension springs are located below the door. The opener – The opener is the device that opens and closes the door. It is usually mounted to the ceiling or overhead.