The main challenge in understanding cooling performance in a legacy data center is the invisible transport medium (air). This seminar describes a comprehensive experimental characterization of a new data center lab. Airflow and temperature measurements are utilized to understand the facility’s performance at different operational stages. Since the facility houses a wide range of different IT equipment (servers, switches, storages, blades), it is important to understand the airflow demand of each. The IT was tested and flow characterized. The characterization data is integrated via compact models into a full CFD simulation. Measured data from the facility are used for validation.