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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.
	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 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 - 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

Construction and Insulation

Insulated 2-Layer Steel	Insulated 3-Layer Steel	Non-Insulated Steel	Full View Aluminum	Specialty Applications