Apart from providing wind protection, closure systems serve to seal off vehicle entrances that are larger than standard doors. In the closed position, they are tensioned by ratchets to create an effective barrier against wind and weather. In terms of opening action, a distinction is drawn between rolling and folding, and between upward- and side-opening systems.
The roller blind closure is used to close off vehicle entrances that are larger than standard closures. The hanging is either fully wound up at the top (open position) or unrolled and tensioned at the bottom by ratchets (closed position). Extra-long systems can be operated by means of a fixed drive motor with long telescopic articulated coupling or a travelling drive motor. Shorter units can be operated by crank handle with integral gearbox.