- 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.
- Window configuration
- Glazing size, placement, pane type, frames, and retainers affect section layout, finished weight, reinforcement selection, privacy, daylight, and exterior appearance.
- 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.