- Window Lite
Glazed section with various types of glass or clear acrylic to allow for light and visibility. - Sections
Steel panels reinforced with stiles interconnected with hinges and rollers. - Bottom Bracket
A structured support that provides for attachment of lifting cables. - Cable Drum
Grooved drums on the torsion spring shaft that lifting cables wind around when the door opens. - Torsion Springs
Provides the means to raise and lower the door via cable winding on drums. - Extension
Extends along both horizontal tracks. - Rear Hanger Track
- Track
Provides a guide for section to raise or lower door.
- Track Types: Standard, 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 – Typically 4 sections high
- 8 feet high – Typically 5 sections high
Gauge = Steel Thickness
- A lower number is better. 24 gauge is thicker than 25 gauge