- Required design pressure
- The project's inward and outward pressure criteria shape which complete door assemblies are suitable, including their reinforcement, tracks, hardware, and attachment details.
- Section construction
- Single-skin, insulated, and composite-core sections differ in weight and structure. The chosen profile and thickness affect the door package and counterbalance requirements.
- Headroom and ceiling obstructions
- Low ceilings, beams, ducts, lighting, heaters, storage racks, and sloped roofs can change the lift arrangement, rear supports, and installation access.