Das Weather protection grid, System 782, from MLL Hamburg, is a ventilation grid made of aluminium with a free ventilation cross section of 54%. The system 782 is equipped with a penetration safe V-slat of the heavy series of type 080, which in turn is installed in enclosed Frame 702 by means of a proven clip technology. The slats fastened with the MLL clip system are also removable afterwards for repair work on on the facade or similar purposes.