Al, thanks for the response. Initially I was told one thing, but then spoke with the person that runs the department. He did inform me that the higher pressure is used to run the ventilators in critical care situations – therefore making it patient respiration & answering my questions. The manifold has been in use for 20-30 years and hasn’t…

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So / The medical air cylinders are piped to the hbo chamber, and during the ( i.e air brake ) the gas is inhaled by the hbo patient: This equals not inhaled ????????????