a deposition system for depositing a chemical vapor onto a workpiece , including a deposition chamber having a plurality of components for performing chemical vapor deposition on the workpiece . the deposition chamber includes an inner skin made of hasteloy for sealing the plurality of components and the workpiece from the air surrounding the deposition system , and an outer skin that encloses the inner skin and is separated from the inner skin by an air gap . the outer skin includes vents that create a convection current in the air gap between the inner skin and outer skin of the deposition chamber . the deposition system also has a gas panel for regulating the flow of gases and vapors into the deposition chamber , and a computer for controlling operation of the gas panel and the components in the deposition chamber .