This concerns the renewal of the ventilation systems and their maintenance for 4 years as part of the renovation of a cultural venue/festival hall. The ventilation dismantling work will be carried out beforehand by the construction side. The following new ventilation systems with direct evaporation units are planned: - Festival hall: Modular central ventilation unit 30,300 m3/h - Adjacent rooms: Compact ventilation unit 4,100 m3/h - Cafeteria/Foyer: Compact ventilation unit 4,900 m3/h - WC facilities: Compact ventilation unit 375 m3/h