A data center is disclosed that includes a container; a server; a rack installed within the container and storing the server; and a curtain fixed to at least one point of the rack or the container and separating an internal space of the container between a cold side and a hot side; wherein the rack is configured to enable the circulation of air from the cold side to the hot side. The curtain is fixed by a removable clamping mechanism. The data center further includes a modular refrigeration unit configured to attach to the container and direct cold air into the cold area. At least one prop is positioned below a bottom of the housing and connected to a container bottom, the prop is configured to absorb vibration of the container or housing.