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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 b

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.

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1. A cooling system for directing cooling air from a rack-mounted computer system, comprising: a stack, comprising: an inlet configured to couple with a rack system at an exit of the rack;a lower duct portion;an exit of the stack configured to couple with a ceiling at an opening in the ceiling, wher

1. A cooling system for directing cooling air from a rack-mounted computer system, comprising: a stack, comprising: an inlet configured to couple with a rack system at an exit of the rack;a lower duct portion;an exit of the stack configured to couple with a ceiling at an opening in the ceiling, wherein the opening in the ceiling includes a flow restriction device; andan upper duct portion configured to extend downwardly from the ceiling; andan exit duct, coupled with the exit of the stack, and configured to extend into and through a ceiling plenum above the opening in the ceiling, wherein the exit duct forms an enclosure configured to segregate exit air exiting the rack system and passing through the exit duct from air circulating within the ceiling plenum and air entering the ceiling plenum from one or more other rack systems, such that air circulating within the ceiling plenum and air entering the ceiling plenum from one or more other rack systems is recirculated and the exit air passing through the exit duct passes into ambient air outside the ceiling plenum;a flexible portion of increasing passage size coupled between the lower duct portion and the upper duct portion, wherein the flexible portion is coupled with the upper duct portion at a point below the ceiling, wherein the lower duct portion is configured to direct cooling air from the inlet to the flexible portion, wherein the flexible portion is configured to direct cooling air from the lower duct portion to the upper duct portion,wherein the lower duct portion comprises a lower duct cross-sectional area, wherein the cross-sectional area of the flexible portion increases from a first cross-sectional area where the flexible portion couples to the lower duct portion to a second cross-sectional area where the flexible portion couples to the upper duct portion, wherein the upper duct portion is above the flexible portion, wherein the upper duct portion comprises a passageway configured to direct air that is downstream from the flexible portion of increasing passage size through the opening in the ceiling, wherein the upper duct portion comprises an upper duct cross-sectional area that is larger than the second, increased cross sectional area of the flexible portion. 2. The cooling system of claim 1, wherein the flexible portion is adjustable to laterally adjust the lower duct portion of the stack relative to upper duct portion. 3. The cooling system of claim 1, wherein the flexible portion is adjustable to adjust a size of an opening of the inlet. 4. The cooling system of claim 1, wherein the flexible portion is adjustable to alter a shape of an opening of the inlet. 5. The cooling system of claim 1, further comprising at least one magnet portion configured to couple the inlet to rack system. 6. The cooling system of claim 1, further comprising at least one tab to couple the exit to the ceiling. 7. The cooling system of claim 1, wherein the flexible portion comprises a fabric. 8. The cooling system of claim 1, wherein the flexible portion comprises an expandable fabric. 9. The cooling system of claim 1, wherein the flexible portion comprises a plastic sheet material. 10. A cooling system for rack-mounted computers in a computer room, comprising: a forced air system configured to move cooling air through one or more computers in one or more rack systems in the computer room, wherein the forced air system comprises an air handling system configured to force air into the computer room through a raised floor of the computer room;one or more stacks coupled between one or more of the rack systems and a ceiling of the computer room, the stacks being configured to direct cooling air exiting from one or more exits on one or more of the rack systems to one or more openings in the ceiling, wherein at least one of the stacks comprises: a lower duct portion;an upper duct portion configured to extend downwardly from the ceiling; anda flexible portion of increasing passage size coupled between the lower duct portion and the upper duct portion, wherein the flexible portion is coupled with the upper duct portion at a point below the ceiling, wherein the lower duct portion is configured to direct cooling air from an inlet to the flexible portion, wherein the flexible portion is configured to direct cooling air from the lower duct portion to the upper duct portion, andwherein the lower duct portion comprises a lower duct cross-sectional area, wherein the cross-sectional area of the flexible portion increases from a first cross-sectional area where the flexible portion couples to the lower duct portion to a second cross-sectional area where the flexible portion couples to the upper duct portion, wherein the upper duct portion is above the flexible portion, wherein the upper duct portion comprises a passageway configured to direct air that is downstream from the flexible portion of increasing passage size through the opening in the ceiling, wherein the upper duct portion comprises an upper duct cross-sectional area that is larger than the second, increased cross sectional area of the flexible portion;a ceiling plenum above the opening in the ceiling; andan exit duct configured to extend into and through the ceiling plenum, wherein the exit duct forms an enclosure configured to segregate exit air exiting a rack system coupled to the at least one stack and passing through the exit duct from air circulating within the ceiling plenum and air entering the ceiling plenum from one or more other rack systems in the computer room, such that air circulating within the ceiling plenum and air entering the ceiling plenum from one or more other rack systems is recirculated to the computer room and air passing through the exit duct passes into ambient air outside the ceiling plenum. 11. The system of claim 10, wherein at least one of the stacks is configured to at least partially segregate the exiting cooling air from ambient air in the computer room. 12. The system of claim 10, wherein at least one passageway of the stack is configured to produce a chimney effect in the stack. 13. The system of claim 10, wherein the forced air system comprises an air handling system configured to move air in the computer room. 14. The system of claim 13, wherein the air handling system is configured to force air into the computer room through the raised floor of the computer room. 15. The system of claim 13, wherein the air handling system is configured to draw air out of the computer room through the ceiling of the computer room. 16. The system of claim 10, wherein the forced air system comprises at least one fan in at least one of the rack systems, wherein the at least one fan is configured to move air through the rack system and out through at least one exit of the rack system. 17. The system of claim 10, wherein the upper duct portion is configured to couple to the ceiling. 18. The system of claim 17, wherein the flexible portion is adjustable to align the lower duct portion of the stack with the upper duct portion of the rack system while the upper duct portion is coupled to the ceiling. 19. The system of claim 10, wherein the stack comprises an inlet portion configured to couple to the rack system and an exit portion configured to couple to the ceiling, wherein the exit is larger than the inlet. 20. The system of claim 10, wherein the forced air system comprises: an air handling system comprising a control system; andat least one temperature sensor or at least one humidity sensor in the space above the ceiling,wherein the at least one temperature sensor or the at least one humidity sensor is coupled to the control system, wherein the control system is configured to modify at least one air flow characteristic of the air handling system in response to data from at least one temperature sensor or the at least one humidity sensor. 21. The system of claim 10, wherein the forced air system comprises: an air handling system comprising a control system; andat least one humidity sensor configured to measure ambient outside air,wherein the at least one humidity sensor is coupled to the control system, wherein the control system is configured to modify at least one air flow characteristic of the air handling system in response to data from the at least one humidity sensor. 22. The system of claim 10, wherein the flexible portion defines a passageway having a rectangular cross section, wherein the rectangular cross section has a uniform length and a varying width, wherein the width increases from a first width at the first cross sectional area to a second width at the second cross-sectional area. 23. The system of claim 10, wherein the upper duct portion and the lower duct portion each comprise a rectangular sheet metal duct.