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Choosing the Best Portable Oxygen Concentrator: Sound Level

by | Dec 13, 2012 | Learn | 26 comments

We’ve covered a lot of ground with our series on choosing the best portable oxygen concentrator. We began with the oxygen flow, then discussed the size and weight, followed by the battery power. Now we’re wrapping up the series with an often-overlooked factor–the sound level.

Here’s the low-down on the official sound levels as provided by the manufacturers:

DeVilbiss iGo Portable Oxygen Concentrator
Continuous and Pulse Flow Units

SeQual Eclipse 3 – 41 dBA

DeVilbiss iGo – 40 dBA

Oxlife Independence – 40 dBA

Invacare Solo2 – 42 dBA

Respironics SimplyGo – 43 dBA

Inogen One G2 and G3 Portable Oxygen Concentrators
Pulse Flow Only Units

Inogen One G2 – 38 dBA

Inogen One G3 – 42 dBA

Respironics EverGo – 43 dBA

Invacare XPO2 – 46 dBA

AirSep FreeStyle – 41 dBA

Inova LifeChoice – 46 dBA

But what does it mean? Well, the dBA is the decibel measurement. Keep in mind that this is an exponential rating system, so a difference of 5 decibels is noticeably louder.

Also, the average decibels of a quiet home is 40 dBA. Therefore, you’ll find that most units, particularly the larger, continuous, and pulse flow models, are a low hum, not much louder than your refrigerator when it kicks on, and much quieter than the average dishwasher.

The pulse-only models is where you’ll find a wider range of decibel ratings. The Inogen One G2 is noticeably the quietest portable concentrator on the market today. The new Inogen One G3 has a quiet motor like the G2, but it has a loud purging sound; so every fifteen seconds you hear *tsshh*. While this doesn’t bother some people at all, others find it personally distracting, and they feel uncomfortable with the unit when out in public, particularly in quiet places, like church or the theater.

While it is perhaps not the greatest concern when choosing a portable oxygen concentrator, it is often a factor for many. Think about your personal hearing sensitivity and the places you plan to use your portable oxygen concentrator. Would a higher noise level bother you? Would it distract others around you?

Use this information to help you find the best portable oxygen concentrator for you.


  1. john O'Callaghan

    I have hired a devilbliss home oxygen concentrator,and it is very noisy,one cannot possibly have it in the bedroom overnight..is there an almost silent one on the market?,which is best to buy outright or hire..this heavy machine I have would not allow anyone to sleep with it anywhere near a bedroom..your help will be appreciated

    • Allison Waters

      It seems that most people who rent a home oxygen concentrator from a local homecare company usually are given an old concentrator that is about 50 pounds and 50 decibels. If that is what you were given, then you will be pleased to learn that there are smaller and quieter units available. There are several units that are 39-40 decibels: Respironics EverFlo Q, Invacare Perfecto2 W, and the AirSep VisionAire.

      Whether it is best to rent or purchase a unit is a personal decision; however, with units available starting at around $600, it seems that purchasing would be the most economical. Here is one source that provides good prices and gives you a nice comparison of the models available – Home Oxygen

      • Don Sessler

        I have one of the old and noisy concentrators. It sits in my dining room downstairs with 2 ea 40 ft tubes running to it. One goes up to my bed upstairs and one stays downstairs. Only one tube hooked up at a time, of course. This keeps the noise away from my bedroom.

  2. Marylouwaitt

    Hi Allison, I’m a newby. What do you think of Activox portable oxygen concentrator? My oxygen provider is pushing that. They don’t carry the Inogen One G3 .

    • Allison Waters

      The Activox is a nice unit – small and lightweight and provides up to Setting 3 pulse. However, it does have more service issues than the Inogen One G3. As long as your provider is helpful in providing a loaner/replacement unit if/when the unit needs service, then you should do well with the Activox. If you are purchasing a unit, then you may want something more reliable.

  3. Jenny

    Hi I live in South Africa

    Need your advise I am on oxygen 24/7 have a airsep new life elite at home for general and sleep. Need a portable only have choice of Airsep Freestyle or Inogen 2 which would you suggest my setting on my home one is 3lpm and 4 for exercise.

    thanks Jenny

    • Allison Waters

      Since the AirSep FreeStyle only goes up to setting 3, and the Inogen One G2 goes up to setting 6, the Inogen One G2 would best meet your oxygen needs of 4 LPM for exercise.

  4. Mary

    Hi Allison,

    Thank you for providing this dialogue. I am new to this and am trying to get back to a more normal life. Could you compare the Freestep with the Inogen 2 or 3? I am often in meetings so the noise is an issue for me, but I also am hopeful that as life stabilizes a bit I will engage in more travel. I am not ready to be stationary so the quality and light weight of the portable concentrator are important to me.

    Thank you for engaging in this discussion. So often the response has been, this is all that we carry.


    • Allison Waters

      The Inogen One G2 is by far the quietest. The AirSep FreeStyle would be average. And the Inogen One G3 is noisy (it has a rather loud purging sound every 15 seconds). If you can handle the extra weight of the Inogen One G2, I would highly recommend it for your noise concerns. It is also a good, dependable unit.

      • catherine paquette

        I have Inogen one G2 it is very heavy. If I had to carry it a lot It would not be the one for me. They sent me Inogen one G3 OMG it was was so loud I was amazed they tell people is it very quite. I am very disappointed in the Inogen one products. I am looking for another company that doesn’t lie to their customers.

        • allison

          The Inogen One G3 is definitely louder than the G2. However, newer units are quieter than the original ones. If your unit is particularly loud then you probably have an older unit. The first 2 digits of the serial number indicate the year it was manufactured.

  5. Christine Kelm

    Hello, I am new to all of this and trying to find a portable, continuous flow machine for my 81 year old mother. We are looking for a machine that is as quiet as possible, a battery life of at least five hours and/or has the ability to charge in the car, and as light as possible.

    Thank you.

    • Allison Waters

      I cannot provide a direct answer without knowing the flow setting your mother requires. If 2 LPM, then the Philips SimplyGo is the smallest unit available, although no the quietest. Larger units, such as the SeQual eQuinox and SeQual Eclipse 5 will provide up to 3 LPM and be quieter (the eQuninox is the quietest). Battery times depend on the flow setting, although on continuous flow you would need at least 2-3 batteries to get 5 hours.

  6. Ann

    Hi there, my husband has become oxygen dependent and they delivered a unit that is so loud, it is unbearable. It is an invacare platinum 10. My husband requires 2 liters at rest and 6 if he is moving around which he doesn’t do. What would be the quietest unit to meet his needs?

    • Allison Waters

      Unfortunately, with a prescription of 6 LPM, a high capacity concentrator is necessary and they are all loud. If the doctor will reduce the oxygen requirement to 5 LPM while active then a smaller and quieter concentrator can be used, such as the Respironics EverFlo Q or the AirSep Visionaire, which are both much quieter than the Invacare Platinum 10.

  7. Sylvie Brown

    Which concentrator is the quietest: the LifeChoice ActivOx or the Inogen One G3?

    • allison

      The new High-Flow Inogen One G3 is the quietest, following by the Activox and the old Inogen One G3.

  8. Nina Ursitti

    When comparing the motor sound only (not the purge/pulse sound) how does the Inogen G2 compare with the G3? Do the 38 vs 42 decibels above refer to the pulse sound (not background motor)? We just had a G3 delivered yesterday ( a 2016 model) and are disappointed in that respect. My husband needs setting 5 when walking. The background motor sound is quite loud and distracting to both of us, even on the lower settings. You say they both have a quiet motor so that seems to infer that the do not differ in that respect (background motor sound) but I could be misinterpreting. Appreciate your insight !

    • Allison Waters

      All the way around, the G2 is noticeably quieter than the G3. Both the motor and the purging sound are quieter with the G2. If the extra weight isn’t an issue, I’d recommend exchanging the unit for a G2. And with flow settings up to 6, it provides a little bit more oxygen in the event that your husband needs it.

  9. Dee Lieber

    I’m looking for a portable, continuous flow unit to use a few times per year when I’m at altitude. Setting is 2 LPM and I’m prioritizibg quiet over size since I use it almost only while I sleep. Which units would you suggest I consider? Thanks so much! I’ve rented big units for years and think it’s time to get my own and it’s very confusing!

    • Allison Waters

      The quietest unit available is the Inogen At Home. This is a home concentrator that is somewhat travel-sized – it is 18 pounds. An even smaller home concentrator is the Philips SimplyFlo, which is 8.5 pounds but noticeably noisier. Since you need oxygen only at night, choosing a travel-sized home concentrator would be less expensive than a portable concentrator.

      If you want a true portable concentrator, meaning one that runs on DC and battery power in addition to AC power, then the GCE Zen-O and the Philips SimplyGo both provide up to 2 LPM continuous flow and both weigh about 10 pounds. Of the two, the Zen-O is quieter.

  10. Terry Minadeo

    Thanks for the information. Can you inform me on the GCE Zen o portable concentrator noise level? My needs are continuous, nocturnal at 2 lpm.

    Thanks again,

    Terry M.

    • Allison Waters

      The manufacturer has only provided the noise level at pulse setting 2; it is 42 dBA.

  11. Torsten

    Hi Alison

    I have an Philips Simplygo Oxygens concentrator , first time user.
    For night time use, how far away can I position the unit from the bed I.e. what is the max length of oxy tubing without loosing efficiency/effectiveness?

    • Allison Waters

      The manufacturer recommends that the SimplyGo be used with cannula tubing up to 30 ft.

  12. Don James

    I’m on oxygen and i bought an inogen g3 but it didn’t supply enough oxygen to keep my oxygen levels high enough during sleep. So I sold that unit and bought a SimplyGo which has both pulse and continuous flow. Only the continuous flow setting of 2 generated enough oxygen to raise my oxygen levels, the highest pulse setting could not. Pulse numbers are not equal to continuous flow numbers. A continuous flow setting of 2 provides more oxygen than a pulse setting of 6. What I needed was continuous flow at 2 which a year later is starting to not be enough. Jenny’s current machine only provides constant flow so I’m concerned that no portable will provide her the equal of what she is getting now. Maybe her doctor has ok’d less oxygen for travel or exercise? None of the Inogens provide continuous flow oxygen. I realize this is 8 years later but may apply to other posts.