Andersia Tower is one of the tallest buildings in Poznań, located in the heart of the business district. It offers 19 floors of modern office, hotel, and retail space, with breathtaking views of the city. With its convenient location and numerous amenities, such as a conference center, swimming pool, and underground parking, Andersia Tower is an ideal place for conducting business. The smoke ventilation duct leakage test evaluated their condition, which is crucial for ensuring fire safety and preventing the spread of smoke within the building. The replacement of the central unit with a Fan Wall system significantly improved energy efficiency, reducing energy consumption, while also increasing the reliability and flexibility of the system.