Choosing a Portable Oxygen Concentrator Sales or Rental Inogen Sequal Airsep EverGo XPO2. To see our website and the Portable Oxygen Concentrators section, please click below: www.gosouthernmd.com We give you the facts in a very private video from an industry veteran with over 12 years experience about how to choose between a Continuous Flow or Pulse Dose Portable Oxygen Concentrator so you can make the CORRECT decision. Choosing a Portable Oxygen Concentrator Sales or Rental Inogen Sequal Airsep EverGo XPO2.3gp DeVilbiss Healthcare’s iGo International Biophysics Corporation’s LifeChoice Inogen’s Inogen One G2 The FAA previously approved these portable oxygen concentrators for use: Delphi Medical Systems RS-00400 Invacare XPO2 AirSep Lifestyle AirSep Freestyle Inogen One SeQual Eclipse Respironics EverGo A concentrator does not store oxygen. It produces and distributes it continuously. It takes the air around it, which normally contains 21 percent oxygen, and removes the nitrogen. The theoretical result is air that is 95.5 percent pure oxygen. In actuality, concentrators produce oxygen that is generally between 87 and 95 percent pure–the higher the setting, the less pure. Medicare requires the purity to be greater than 85 percent. power. Does it contain its own power? Will a car’s 12 volt DC battery power it? 110 volts AC in a motel room? All three? flow. Does it have a continuous flow setting for nighttime use? noise. Is it quiet enough to allow sleep in a motel room …