With an internal configuration, the curtain, guide rails, and winding shaft sit behind or within the garage opening. This keeps the mechanism less visible from outside and can accommodate rectangular, chamfered, segmental, or Norman arch openings, subject to the required fitting space and confirmed measurements.

With an external configuration, the curtain, guides, and winding shaft sit in front of the opening. This can suit garages where there is insufficient room for the mechanism inside, while preserving more usable space behind the garage.