Summary of Oxygen Concentrator Liter Flows

The oxygen provided by oxygen concentrators are measured in LPM (liters per minute) for continuous flow, or the equivalent thereof in ml/min (milliliters per minute) in pulse dose oxygen. Continuous flow oxygen always flows from the cannula and never stops until you shut it off. Pulse dose oxygen is released in puffs of air, often referred to as a "bollus". Many portable models only have pulse dose settings, while some also offer continuous flow in lower settings.

3 Liter/LPM Portable Oxygen Concentrators

The AirSep Focus and AirSep Freestyle are two very small yet powerful portable oxygen concentrators. Even though they're very small, they can put out up to the equivalent of 3 LPM of pulse dose oxygen. They are also ideal for those who need oxygen therapy while exercising, and those who do a lot of traveling.

4 Liter/LPM Portable Oxygen Concentrators

The Inogen One G3 and the Lifechoice Activox by Inova Labs are two more portable oxygen concentrators in the more lightweight category. Since they are a little bigger than the models previously mentioned, they are capable of having a higher oxygen output.

5 Liter/LPM Portable Oxygen Concentrators

The larger and slightly heavier models, The Inogen One G2, AirSep Freestle 5 and Invacare XPO2, have a maximum output of the equivalent of 5 LPM. The Freestyle 5 is a great portable concentrator, because it still manages to stay small while still delivering this amount in the pulse dose equivalent.

6 Liter/LPM Portable Oxygen Concentrators

These larger portable models have a total maximum capacity of 6 LPM (equivalent) – The Respironics EverGo and SimplyGo (pulse dose only), Sequal Eclipse, and the Igo by DeVilbiss. The Eclipse, for example, is one of the portable models that also features continuous flow settings up to 3 LPM. They also feature a high purity rate.

2 Liter/LPM Home Oxygen Concentrators

Our one 2 LPM stationary oxygen concentrator, is the Respironics SimplyFlo. It only has two settings, 1 LPM and 2 LPM, but if this is all you need for a few hours daily or overnight, you can enjoy the small size and light weight of this concentrator, which weighs less than 9 lbs.

5 Liter/LPM Home Oxygen Concentrators

With the 5 LPM stationary oxygen concentrators, the Respironics EverFlo, Invacare Perfecto, and AirSep Visionaire, we're getting into the larger and heavier stationary oxygen concentrators that can only be used at home, while plugged into an AC power source. These are the concentrators necessary for those who need a higher dose of oxygen.

10 Liter/LPM Home Oxygen Concentrators

Sometimes it's necessary for a patient to receive anywhere from 5 LPM to 10 LPM of oxygen therapy, and that's where the AirSep Intensity 10, The Respironics Millenium 10, and the Invacare Platinum 10 come in. These powerful stationary models often offer other features, such as the ability to run a nebulizer as well.

10 thoughts on “Summary of Oxygen Concentrator Liter Flows”

  • Jonathan A. Hines
    Jonathan A. Hines May 11, 2017 at 3:47 pm

    My wife is at end stage copd. She needs between 5 and 8 liters of oxygen depending on her activity. Do they offer machines that produce more than 10 liters ? That is as high as her machine will go.

    • Danielle Jason
      Danielle Jason May 16, 2017 at 5:58 am

      Unfortunately, we do not offer any units that produce more than 10 liters however, there is a possible solution. We can tether 2 concentrators together to produce the higher flow that your wife requires. If you'll give our Oxygen Specialists a call at 877-774-9271 they'll be able to work with you to find a solution.

  • tsubasa ozora

    My grandmother needs 6-7 ltrs oxygen so we've merged two months concentrators together At what setting does the airsep visionaire concentrator give max O2 output %? Is it 3ltr, 3.5ltr or 4ltr?

    • Danielle Jason

      Thank you for your comment. If you'll give our Customer Service Department a call at 877-303-9289, they'll be able to work with you to better understand concentrator tethering.

  • Barry Drske

    Hi. I have an InogenOne G3 and have been told by a friend in the UK that the highest setting gives only 2Lpm. Is that true? On an American site it says 1050ml. What is that equivalent too?
    Barry Drake

    • Danielle Jason

      Great question, Barry. The Inogen One G3 manual indicates that it delivers roughly 14ml per bolus per flow setting at 15 breaths per minute so approximately 210ml/min per flow setting. Depending on your model, if the settings go up to a flow setting of 5, it can deliver upwards of 1050ml.If you'd like to know more about the specifications and specifics of the machine, feel free to view the online user manual here:

  • MASiddiqui

    I am prescribed 4LPM (continuous) at what setting should I set respironics simplygo so that the pulse setting will be equivalent to 4LPM continuous.

    • Danielle Jason

      Thank you for your question, MASiddiqui. The Respironics SimplyGo can only perform up to 2LPM on the continuous flow setting. You will not be able to achieve 4LPM with your machine's continuous flow.

  • Jacky

    How do you no how many liters to run my wife's o2 at night goes from low 80s to 99 while sleeping

    • Danielle Jason

      That is something your doctor would have provided you when you received your prescription. Your prescription will indicate how much oxygen you require.


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