By Huu Khanh Nguyen · Updated October 28, 2026 · sectional, track, low-headroom, lhr
The guide tracks of a sectional garage door for a low lintel, with a second upper track that carries the top roller so the door folds flat.
| Name | Default | Unit |
|---|---|---|
| Width | 2548 | mm |
| Depth | openingHeight + 750 | mm |
| Height | curveStart + curveRadius + 1.5 * trackWidth + ceilingGap | mm |
| Opening height | 2125 | mm |
| Track width | 51 | mm |
| Curve radius | 305 | mm |
| Curve start below the door top | 400 | mm |
| Ceiling gap | 200 | mm |
| Height of the curve start | openingHeight - curveDrop | mm |