Prime Plus rapid doors are mainly used for external applications. The door is equipped with a spring steel wind lock in the curtain pocket that confirms silent door travel, higher wind loads, and curtain stability. External Application and compact design. Industrial rapid door designed by us are self-supporting construction with an anti-crash protection system, protects the traction unit, and enable rapid wiring and safety photocell. Rapid doors also have flexible curtains in self-extinguishing material and vertical seals made of friction-resistant semi-hard and PVC spring steel wind lock in curtain pockets to ensure silent door travel, higher wind loads, and curtain stability.