1.The door is designed for emergency escape passage where a large number of pedestrian pass by. Such as airport, hospital, bus station, mall, hotel and other public buildings.

2.Under normal circumstances, the middle leaves move by slide way, and two fixed side panel hold on. When emergency happens, no matter where the position and statue of panels are, all the four panels could be pushed rapidly as swing door to maximize utilization of exit space.

3.Running quietly and smoothly. Whenever obstruction happens during its operation cycle, the door will rebound automatically to ensure the safety of passengers.