A modular data center comprising: a. a primary structure; b. a plurality of information handling systems arranged in a rack within the primary structure; and c. a modular fluid handling system coupled to the primary structure, wherein the modular fluid handling system comprises an air-handling unit, a mixing unit and an evaporative unit; d. wherein the air-handling unit is in fluid communication with the primary structure, wherein the air-handling unit comprises a first and a second damper (733, 734), an enclosure which is positioned over an aperture of the air-handling unit, and wherein the aperture is formed by an opening in the top of the primary structure aligns with an opening in the bottom of the air-handling unit and a fan attached to the side of the enclosure,, wherein the first damper, when modulated to an open position, allows air from within the air-handling unit to mix with air outside of the modular data center [p. 11, 1. 28-30], wherein the second damper, when opened, allows fluid communication between the air-handling unit and the mixing unit; e. wherein the evaporative unit includes at least one cooling mechanism and at least one third damper, which, when opened, allows fluid communication between the evaporative unit and the outside environment, and wherein the evaporative unit is in fluid, electrical and signal communication with the primary structure; and f. wherein the mixing unit is in fluid communication with the air-handling unit and the evaporative unit, the mixing unit including a fourth damper, which, when opened, allows fluid communication between the mixing unit and the outside environment; and g. wherein air can enter the modular data center through the mixing unit, past the fourth damper, wherein the air entering the mixing unit from the outside mixes with air entering the mixing unit from the air-handling unit via the second damper, wherein the fan pulls warm air from the mixing unit into the evaporative unit and through the racks, wherein the air is then pulled into the air-handling unit, where some of the air is expelled into the outside via the first damper and some enters the mixing unit via the second damper. a. a primary structure; b. a plurality of information handling systems arranged in a rack within the primary structure; and c. a modular fluid handling system coupled to the primary structure, wherein the modular fluid handling system comprises an air-handling unit, a mixing unit and an evaporative unit; d. wherein the air-handling unit is in fluid communication with the primary structure, wherein the air-handling unit comprises a first and a second damper (733, 734), an enclosure which is positioned over an aperture of the air-handling unit, and wherein the aperture is formed by an opening in the top of the primary structure aligns with an opening in the bottom of the air-handling unit and a fan attached to the side of the enclosure,, wherein the first damper, when modulated to an open position, allows air from within the air-handling unit to mix with air outside of the modular data center [p. 11, 1. 28-30], wherein the second damper, when opened, allows fluid communication between the air-handling unit and the mixing unit; e. wherein the evaporative unit includes at least one cooling mechanism and at least one third damper, which, when opened, allows fluid communication between the evaporative unit and the outside environment, and wherein the evaporative unit is in fluid, electrical and signal communication with the primary structure; and f. wherein the mixing unit is in fluid communication with the air-handling unit and the evaporative unit, the mixing unit including a fourth damper, which, when opened, allows fluid communication between the mixing unit and the outside environment; and g. wherein air can enter the modular data center through the mixing unit, past the fourth damper, wherein the air entering the mixing unit from the outside mixes with air entering the mixing unit from the air-handling unit via the second damper, wherein the fan pulls warm air from the mixing unit into the evaporative unit and through the racks, wherein the air is then pulled into the air-handling unit, where some of the air is expelled into the outside via the first damper and some enters the mixing unit via the second damper.