A building for a data center (or server farm) includes a chimney structure that interfaces with the environment and one or more housings coupled to the floor and the chimney structure. Each housing includes one or more racks with multiple servers, and each server includes a computer fan that can change speed or reverse direction. The building also includes one or more filters between the one or more housings and the environment, and one or more walls operable to lie between the one or more filters and the environment. Yes. [Selection] Figure 5A
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