Ventilation system with RLT-devices 4x ALKO AT4 16x12 Built 2003, exhaust air 11,000 m3/h, 350 Pa external pressure, 3/0.9 kW, various rectangular pipe parts, possibly fire-extinguishing device, all pipe parts running in the building, partly wall-throughs, partly exterior passageways, external passageways must be closed, with other parts standing on the garage ior lying