The double-panel door, System 622, from MLL Hamburg is a weather protection door made of aluminium with a free ventilation cross section of 50%. The system 622 is equipped with a sliding-water safe, Z-slat of the medium series of type 020. Fastening to the slats occurs via enclosed Frame 602. Doors from MLL Hamburg can also be manufactured individually for you on request with all other slats from the weather protection program.