A cooling system, comprising: an inflatable air duct (226, 256) to be positioned above a cold aisle defined between two rows of electronic equipment (18a, 18b), the inflatable air duct (226, 256) to extend along a length of the cold aisle, the inflatable air duct (226, 256) to be air permeable to deliver conditioned air into the cold aisle, the electronic equipment (18a, 18b) having fans to force cool air within the cold aisle through the electronic equipment (18a, 18b) to adjacent hot aisles (22a, 22b) on opposite sides of the two rows of the electronic equipment (18a, 18b), the inflatable air duct (226, 256) to be spaced apart from the rows of the electronic equipment (18a, 18b) such that the cold aisle is in unobstructed fluid communication with the adjacent hot aisles (22a, 22b) over tops of the rows of the electronic equipment (18a, 18b), the conditioned air delivered from the inflatable air duct (226, 256) to reduce a mixing of warm air in the hot aisles (22a, 22b) with the cool air in the cold aisle, and a nozzle (230, 262) to be attached to a wall of the inflatable air duct (226, 256), the nozzle (230, 262) providing a discharge path for the conditioned air from an interior of the inflatable air duct (226, 256) toward the cold aisle, the nozzle (230, 262) to guide a discharge current of air through the discharge path, wherein the wall surrounding the nozzle (230, 262) is to be air permeable, the discharge current of air to entrain the conditioned air passing through the air permeable wall, wherein a velocity of the discharge current of air is to be insufficient to entrain ambient air above the two rows of the electronic equipment (18a, 18b). an inflatable air duct (226, 256) to be positioned above a cold aisle defined between two rows of electronic equipment (18a, 18b), the inflatable air duct (226, 256) to extend along a length of the cold aisle, the inflatable air duct (226, 256) to be air permeable to deliver conditioned air into the cold aisle, the electronic equipment (18a, 18b) having fans to force cool air within the cold aisle through the electronic equipment (18a, 18b) to adjacent hot aisles (22a, 22b) on opposite sides of the two rows of the electronic equipment (18a, 18b), the inflatable air duct (226, 256) to be spaced apart from the rows of the electronic equipment (18a, 18b) such that the cold aisle is in unobstructed fluid communication with the adjacent hot aisles (22a, 22b) over tops of the rows of the electronic equipment (18a, 18b), the conditioned air delivered from the inflatable air duct (226, 256) to reduce a mixing of warm air in the hot aisles (22a, 22b) with the cool air in the cold aisle, and a nozzle (230, 262) to be attached to a wall of the inflatable air duct (226, 256), the nozzle (230, 262) providing a discharge path for the conditioned air from an interior of the inflatable air duct (226, 256) toward the cold aisle, the nozzle (230, 262) to guide a discharge current of air through the discharge path, wherein the wall surrounding the nozzle (230, 262) is to be air permeable, the discharge current of air to entrain the conditioned air passing through the air permeable wall, wherein a velocity of the discharge current of air is to be insufficient to entrain ambient air above the two rows of the electronic equipment (18a, 18b).