The opening force is small, and it has nothing to do with the size and direction of the wind pressure in the roadway.
Two way wind separation, no need to set reverse damper;
The throttle can automatically close after the passenger car has passed
Two way sealing, small air leakage;
Smooth shutdown, safe and reliable
Anti-corrosion, moisture-proof, fire-proof, high strength and small deformation
Locking can be realized between two doors;
The system is simple and easy to maintain.