The largest parts of a Clopay garage door are the glazed windows and steel panels. Other parts include a bottom bracket, lifting cables, cable drums, torsion springs, extension springs, rear track hangers and tracks.
The glazed windows, which can be glass or acrylic, are usually placed along the top of the garage door to ensure a greater degree of privacy. Homeowners can choose from a rectangular row of windows, a customized design or elect to go without them. Alternatively, some garage door designs have frosted glass, and the windows are extended beyond the first row.
Sectioned steel panels that are connected with hinges and rollers are the most common design. Usually divided into sections of four, they fold up and back when the garage door opens. Wood doors are also an option, usually made of redwood, western red cedar or hemlock. Custom-designed doors are available for larger garages, sometimes with five or more panels.
The lifting cables are attached to the bottom bracket and travel around the cable drums. The torsion springs raise and lower the garage door by governing the direction the cables move on the drums. The extension springs, rear track hangers and the tracks all support the garage door as it moves up or down. Tracks are available in standard or low-headroom styles.