Garage Door Fundamentals
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 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 garage door via cable winding on drums.
Extension extend along both horizontal tracks
Rear Track Hanger
Track Provides a guide for section to raise or lower the garage door.
Track Types:
Standard
Low Headroom
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
Headroom Chart
4-1/2'–10" – low headroom track
10" – standard track/extension spring
12" – standard track/torsion spring
14" or more – required for operator
