The Pettelaarpark in 's-Hertogenbosch (the Netherlands) offers space for several companies, with space for 420 cars in the parking garage. Axial fans are used in this underground parking garage. These ensure a continuous basic ventilation of at least 10,140 m3 air/h. For the complete air mixing, nine jet fans have been installed in the parking garage also. These ensure that there is always fresh air supply.