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Garage Door Basics

Basic Terms

Window Lite
Glazed section with various types of glass or clear acrylic to allow for light and visibility.

Steel panels reinforced with stiles interconnected with hinges and rollers.

Bottom Bracket
A structured support which provides for attachment of lifting cables.

Cable Drum
Grooved drums on the torsion spring shaft that lifting cables wind around when door is opening.

Torsion Springs
Provides the means to raise and lower the door via cable winding on drums.

Extends along both horizontal tracks

Rear Hanger Track

Provides a guide for section to raise or lower door.
Track Types:
Low Headroom
High Lift
Vertical Lift
Track Components:
Vertical Track: on either side of opening.
Horizontal Track: attached to ceiling.
Radius: curved track
Standard Heights:
7 feet high - 4 sections high
8 feet high - 5 sections high

Gauge = thickness of steel
Lower is better. 24-gauge is thicker than 25-gauge.
Track Types

Critical Dimensions

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