Guide the sections as they overlap.

Top section guides
Guide components connect the travel of the adjacent sections. The leaves remain parallel as the gate extends or retracts; they do not fold on hinges.

A large head wheel
The original D-18 close-up shows a large spoked cast-aluminium wheel at the drive head. Smaller wheels support the following sections as they travel.

Lower wind guide
The lower guide device keeps the moving section engaged with its travel line. This structural feature is not a stated wind-load certification.



