Leading-edge flexible automatic doors for easy opening and closing under a significant wind loading in large dimensions in the ultra-demanding conditions of the mining industry. They are used for truck shops, sheds, acid shops, crushing and grinding structures, large width overhead cranes, etc. Their design enables them to operate by transmitting minimum stresses to the building, on high-altitude sites subject to violent winds, negative temperatures, major snow loading, corrosive atmospheric agents, etc. and even to distribute ventilation in the galleries of underground mines!