A copier/duplicator machine having a hose positioned to supply air to an upper cooler section in both its open and in its closed position, the hose being collapsible to its collapsed position when the cooler section is closed and stretchable to an open position of the cooler section with the hose having a spring ratio insufficient to cause the cooler section to close from its open position. In one embodiment, the hose has a stretch ratio of at least 2.4 and a spring ratio of less than 6 ounces per inch.