The size and shape of a data center can impact the ability of Computer Room Air Conditioning (CRAC) systems to adequately cool the heat loads. Larger rooms will typically require a greater number of CRAC units due to limitations on air delivery of the units. So, although a single unit may have the BTU (British thermal unit) capacity to cool a given load, it may be unable to effectively deliver the cool air if the load is spread out in a large room resulting in inadequate data center cooling.