Anatomy of a Garage Door

Here’s the inside look of a sectional door:

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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