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An electronic equipment enclosure includes a frame structure at least partially enclosed by a plurality of panels defining a compartment in which one or more electronic components are mounted and an exhaust air duct that is adapted to segregate hot air being exhausted from the compartment from cool

An electronic equipment enclosure includes a frame structure at least partially enclosed by a plurality of panels defining a compartment in which one or more electronic components are mounted and an exhaust air duct that is adapted to segregate hot air being exhausted from the compartment from cool air entering the compartment, thereby improving thermal management of the enclosure. The exhaust duct includes a lower duct section extending upward from the top panel of the compartment and an upper duct section telescoping upward from an upper end of the lower duct section. Each duct section includes four panels connected together by hinged corner fittings such that the section is collapsible. The upper duct section includes an outwardly flared portion.

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1. An electronic equipment enclosure for mounting one or more electronic components, comprising: (a) a frame structure formed from a plurality of support posts and at least partially enclosed by a plurality of panels, the panels including at least side, top and back panels defining a compartment in

1. An electronic equipment enclosure for mounting one or more electronic components, comprising: (a) a frame structure formed from a plurality of support posts and at least partially enclosed by a plurality of panels, the panels including at least side, top and back panels defining a compartment in which the one or more electronic components are mounted, wherein: (i) the compartment has a top, a bottom and a rear, and(ii) the top panel includes an opening therethrough that is rectangular in shape; and(b) an exhaust air duct, having four side panels connected by four corner fittings, extending upward from the top panel of the compartment, wherein the exhaust air duct is rectangular in cross-section and is disposed in surrounding relation to, and in fluid communication with, the top panel opening;(c) wherein the exhaust air duct is adapted to segregate hot air being exhausted from the compartment from cool air entering the compartment, thereby improving thermal management of the enclosure; and(d) wherein the corner fittings include hinges, thereby facilitating the collapse of the exhaust air duct from a use state to a flattened state. 2. The electronic equipment enclosure of claim 1, wherein each corner fitting extends substantially along the length of each of an edge of a respective panel and an edge of a respective adjacent panel. 3. The electronic equipment enclosure of claim 1, wherein the exhaust air duct is adapted to telescope in length. 4. The electronic equipment enclosure of claim 1, wherein a corner lock is coupled to one of the corner fittings and adapted to maintain the air duct panels in the use state. 5. The electronic equipment enclosure of claim 4, wherein each corner lock includes a main body, a lock plate, and a lock screw. 6. The electronic equipment enclosure of claim 1, wherein an upper edge of each air duct panel is flared outward. 7. The electronic equipment enclosure of claim 6, wherein a respective seal is attached to the upper edge of each air duct panel to limit air escaping from between an upper end of the duct section and a ceiling structure. 8. The electronic equipment enclosure of claim 1, wherein each hinge is a living hinge. 9. The electronic equipment enclosure of claim 1, wherein each corner fitting includes two finger arrays connected together by the hinge. 10. The electronic equipment enclosure of claim 9, wherein each finger array includes a pair of fingers defining a channel. 11. The electronic equipment enclosure of claim 10, wherein each pair of fingers includes a latch finger with a hook adapted to fit over a raised structure on an air duct panel. 12. The electronic equipment enclosure of claim 1, wherein each corner fitting is formed in a co-extrusion process using a first material for the hinge and a second material for the remainder of the corner fitting. 13. The electronic equipment enclosure of claim 1, wherein each corner fitting has a uniform cross-section. 14. The electronic equipment enclosure of claim 1, wherein each corner fitting includes a pair of fingers defining a panel channel in which an edge of an air duct panel is inserted and retained. 15. The electronic equipment enclosure of claim 14, wherein each air duct panel includes a plurality of raised structures along its lateral edges, and wherein the structures are engaged within the panel channel. 16. The electronic equipment enclosure of claim 1, wherein each corner fitting is formed in an extrusion process. 17. The electronic equipment enclosure of claim 1, wherein each corner fitting has a uniform cross-section. 18. The electronic equipment enclosure of claim 1, wherein each panel of the exhaust air duct is planar in form. 19. An electronic equipment enclosure for mounting one or more electronic components, comprising: (a) a frame structure formed from a plurality of support posts and at least partially enclosed by a plurality of panels, the panels including at least side, top and back panels defining a single compartment in which the one or more electronic components are mounted, wherein: (i) the compartment has a top, a bottom and a rear, and(ii) the top panel includes an opening therethrough that is rectangular in shape; and(b) an exhaust air duct, having four side panels connected by four corner fittings, extending upward from the top panel of the compartment, wherein the exhaust air duct is rectangular in cross-section and is disposed in surrounding relation to, and in fluid communication with, the top panel opening such that the exhaust air duct is in direct and unobstructed fluid communication with the interior of the single compartment;(c) wherein hot air from the one or more electronic components travels vertically, within the single compartment, through the top panel opening and into the exhaust duct without passing through the back panel of the compartment, thereby segregating hot air being exhausted from the compartment from cool air entering the compartment; and(d) wherein the corner fittings include hinges, thereby facilitating the collapse of the exhaust air duct from a use state to a flattened state. 20. The electronic equipment enclosure of claim 19, wherein the opening in the top panel is disposed toward the rear of the compartment.