Steel sectional panel sizes
That means most doors still in service are steel sectional panels, usually a 16x7 double or 9x7 single, hung on steel vertical track with roller hardware that matches that late-80s build era. When one of those doors jumps track, the fix is usually mechanical and fast: the rollers have worked loose from the track rail, or a cable has slipped off a drum and let one side of the door drop while the other stays up.
