US Patent 9426903 Cooling air stack for computer equipment

A cooling system for a computer room includes a forced air system. The forced air system moves cooling air through computers in one or more rack systems in the computer room. Stacks are coupled between the rack systems and the ceiling of the computer room. Each stack may include a flexible portion between an inlet portion and an exit portion of the stack. The stacks direct cooling air exiting from exit ports on the rack systems to openings in the ceiling.