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The method used in the datacentre for cooling and recycling the air is a five-stage process. The air first passes through a filter, then a set of filter bags, a direct-expansion chilling system, an adiabatic pre-evaporative cooling system (pictured) and finally a series of fans. The direct-expansion chilling is not powered by default, but the electricity kicks in if the ambient air temperature is registered as too high. Adiabatic cooling works by drawing the air through a filter, which is cooled by water. This helps to dissipate the heat and prevent evaporation.
Under full load, the air can rush through the cooling chambers at a pressure of almost 300 pounds per square inch.