- Opening width and height
- Door area and span influence section construction, reinforcement, track layout, spring sizing, material handling, and the documented configurations available for the project.
- Removal and site access
- Old door construction, damaged components, interior storage, vehicle access, finished surfaces, and the route for full-width sections shape labour and handling plans.
- Track and roller specification
- Heavier track, additional brackets, longer roller stems, different hinges, or revised fastener spacing can be part of the assembly needed for the opening.