Actiflow has extensive experience in assessing and optimizing the cooling systems in data centres. We perform accurate flow simulations that indicate the effects of plenums, perforated tiles, server distribution over the racks, positioning of CRAH units, etc. Moreover, we simulate worst case scenarios in which one or more CRAH units fail. These simulations are relevant for the design of a data centre with full load, but they are also very useful during build-out. Specifically when the load is not evenly distributed in the room. In such scenarios, a good insight in the airflow through the data centre can have a large impact on cooling efficiency and costs. Based on its simulations, Actiflow advices on how to change the layout of a room to reduce costs, without the risk of breaking the agreed SLA.