- 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 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.
Extends along both horizontal tracks.
- Rear Hanger 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:
Gauge = steel thickness
- 7 feet high - Typically 4 sections high
- 8 feet high - Typically 5 sections high
- A lower number is better. 24 gauge is thicker than 25 gauge.