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One of the first things our respiratory specialists need to know when helping you find the ideal portable oxygen concentrator is if you are on continuous or pulse flow oxygen. Pulse flow concentrators only deliver oxygen when you breathe in while the continuous deliver all the time. Watch this video to understand more about the differences between these two types of devices. Give us a call with any questions at 1-800-520-5726 or visit us online at www.1stclassmed.com