illustration of sectional garage door anatomy
Illustration: Jason Lee
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Anatomy of a Garage Door

A sectional door, the most common variety, rolls up and down on steel tracks.

1. Torsion Spring
Counterbalances door's weight so that it can be lifted easily. 

2. Track
Guides door up to ceiling and back.

3. Roller
Rides inside track. Steel ones are noisy; nylon is quieter.

4. Hinge
Connects horizontal sections.

5. Section

6. Lock Bar
Engages with track to prevent door from opening.

7. Weatherstripping
Seals door edges against air infiltration.
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