I am an EMT and have a concern. Some patients require high volumes of oxygen (as high as 15 liters per minute sometimes). Many times oxygen concentrators only go up to 5 lpm. It may be misleading to say 5 lpm because the machines have to operate based upon pressure rather than volume. 5 lpm is only what you'll get directly out of the nozzle. With a long hose, patients will receive about 1 lpm less per 5 or 6 feet. This is not exact, but I have witnessed this first hand. At nursing homes where they have these limited O2 concentrators, it is common practice to run a line out of each concentrator. These three lines are connected to two lines by three prong adapters. The two lines are connected to a single line nasal cannula using one three prong adapter. In this situation, is the patient actually receiving 15 lpm of O2? If a patient had three nasal cannulas in their nose simultaneously from three separate O2 concentrators at 5 lpm, would they be receiving 15 lpm of O2? Diagram __ __ --- ___ __ --- Any help on this matter is greatly appreciated, as I am not convinced the daisy chaining method is actually getting patients the oxygen they need.