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5 Best Portable Oxygen Concentrators for Quiet Operation
By
Jonathan Reed
Updated January 21, 2025

5 Best Portable Oxygen Concentrators for Quiet Operation

Portable oxygen concentrator quiet devices are becoming increasingly popular. They help you receive oxygen therapy without an annoying buzzing noise.
Product Specialist: Emma Clark
Clinical Applications Specialist: Dr. James Bennett

Portable oxygen concentrators (POCs) are a must for anyone needing oxygen therapy. A 2019 study reports that noise and vibrations are among the disadvantages of stationary oxygen concentrators.

Thankfully, one of the positives of POCs over older models is lower noise. Quiet POCs offer discrete usage while ensuring constant and reliable oxygen therapy.

This piece highlights the best portable oxygen concentrator quiet devices. We evaluated multiple models for their sound performance, portability, and overall reliability.

 

Our Top Two Picks?

Our Top Picks?
Long Battery Life
Caire-comfort-220220
Caire FreeStyle Comfort
  • Quiet Operation
  • Long Battery Life
  • Compact
Quiet Operation
inogen-G5-220220
Inogen One G5
  • High Oxygen Flow Rate
  • Reputable Company
  • Lightweight

A Quick Look At the Quite Portable Oxygen Concentrators

caire comfort 100100
CAIRE Freestyle Comfort
$2,995
39.9 dBA
inogen G5 100100
Inogen One G5
$2,995
38 dBA
Inogen G4 100100
Inogen One G4
$3,581
40 dBA
CAIRE SeQual Eclipse 5 100100
CAIRE SeQual Eclipse 5
$3,889
48 dBA
readyo2 pro 100100
ReadyO2 Pro
$1,990
48 dBA

5 Best Quiet Portable Oxygen Concentrators

1. CAIRE Freestyle Comfort

Caire-comfort-220220
Price: $2,995

CAIRE Freestyle Comfort

  • Weight: 5-6 lbs
  • Dimension: 10’’x 7.3’’x 3.1’’
  • Battery life: Single 8 Hrs; Double 16 Hrs
  • Oxygen Concentration: 95%
  • Sound level: 39.9 dBA*
  • Altitude: Up to 10,000 feet
  • Flow settings: Pulse dose (5 settings) 1050ml/min
  • Warranty: 3 Years
Product star rate (3)
In addition to a quiet operation, it offers an impressive battery life.
Long Battery Life
FAA-approved
Low Noise Levels
Higher Price Than Other Models

Our experience with the CAIRE Freestyle Comfort model:

FreeStyle Comfort has a lower noise level of 39.9 dBA. This is the equivalent of a soft conversation, meaning this one fits right in in quiet indoor spaces. These entail offices and classrooms (during lectures, not exams).

In addition to the low volume, the battery life of between 8 to 16 hours is impressive.

The difference in timings is based on setting levels and the number of cells per battery.

We also found that it is designed for ease; its lightweight, curved design hugs the body for comfort. Smart technologies like autoSAT® and UltraSense® ensure precise oxygen delivery tailored to your activity. 

A user-friendly LCD with large fonts and a glow-in-the-dark keypad simplifies tracking. This makes it perfect for seniors with deteriorating vision. It's also FAA-approved, allowing anyone flying to use it—noise-free.

2. Inogen One G5

inogen-G5-220220
Price: $2,995

Inogen One G5

  • Weight: 4.7 lbs
  • Dimension: 7.19’’ x 3.26’’ x 8.15’’
  • Battery life: 6.5 Hrs single battery; 13 Hrs double battery
  • Oxygen Concentration: 90% to 96%
  • Sound level: 38 dBA at setting 2
  • Altitude: Up to 10,000 feet
  • Flow settings:  Pulse (6 settings) 1260 ml/min
  • Warranty: 3 Years on Unit, 1 year on power supply, battery, & Sieve
Product star rate (5)
It is ideal for users, typically in intimate settings.
Quiet operation
Compact size
Reputable Company
A bit more expensive than other models.

Our experience with the Inogen One G5 model:

If you are usually in intimate settings, like one-on-one tutoring sessions, the One G5 is the best POC. Its operation is only 38 dBA, notably quieter than a library. It is also the perfect POC for night use, where you require a silent night to rest.

Our experience using this lightweight POC—at 4.7 lbs—also demonstrated its unmatched versatility. It offers six pulse flow settings and delivers up to 1260 ml of medical-grade oxygen per breath.

Its dual power source (battery or wall power) also ensures flexibility. Extra batteries may be needed for outings exceeding seven hours. 

Another plus is that the parent company is not new to the game. Their innovation shines through in this and other advanced, user-focused designs.

3. Inogen One G4

inognG4 220220
Price: $3,581

Inogen One G4

  • Weight: 2.7 lbs
  • Dimension: 5.91’’x 2.68’’x 6.5’’ /7.2’’
  • Battery life: 2.7 Hrs Single battery
  • Oxygen Concentration: 90% to 96%
  • Sound level: 40 dBA
  • Altitude: Up to 10,000 feet
  • Flow settings: Pulse dose (3 settings) 210 ml/min, 420 ml/min, & 630 ml/min
  • Warranty: 3 Years on Unit, 1 year on power supply, battery, & Sieve
Product star rate (6)
Its compactness and supportive usage in libraries and equally quiet settings.
Independent Lab-tested
Lightweight
Compact
Shorter Battery Life.

Our experience with the Inogen One G4 model:

If you have ever heard the rustling of leaves, that is exactly what the G4’s noise levels compare to. This makes it the perfect fit for outdoor surroundings because the 40dBA sound will get drowned and become one with the environment.

Another plus we experienced is its lightweight and compact design. Even with the extended battery attached, it weighs a low 3.3 lbs. The G4 just screams on-the-go use with zero disturbance.

This unit also has advanced software adjustments that change the bolus volume (amount of oxygen). This amount is based on your breathing rate. So, if you are running, it adjusts to offer more oxygen and vice versa.

Unfortunately, for a 3-hour outdoor activity, the G4 on a single battery will not suffice. Since it caps the time at 2.7 hours, you might need an extra battery that will add two more hours to make 5 hours. 

The other perks are its simple controls, a clear LCD, and worldwide compatibility with AC/DC power supplies.

This device makes daily usage and taking shorter trips a breeze.

4. CAIRE SeQual Eclipse 5

CAIRE SeQual Eclipse 5 220220
Price: $3,889

CAIRE SeQual Eclipse 5

  • Weight: 15 lbs., Battery 3.4 lbs.
  • Dimension: 19.3’’x 12.3’’ x 7.1’’
  • Battery life: 2 Hrs (2LPM continuous flow); 5.2 hours (Pulse dose setting 2)
  • Oxygen Concentration: 90% +5.5/-3%
  • Sound level: 48 dBA
  • Altitude: Up to 10,000 feet
  • Flow settings: Continuous flow (6 settings)  from 0.5 to 3.0 LPM

    Pulse flow (9 settings)
    -Setting 1-6 delivers 16 to 96 ml/breath
    -Setting 6-9 delivers 128 to 192 ml/breath

  • Warranty: 3 Years, 1 year battery, power supplies, standard accessories
Product star rate (7)
It is best for active users needing consistent, continuous, and pulsated oxygen delivery for different settings.
Highly Customized,
FAA-approved
AC/DC Charging Compatibility
It is a heavy POC
Expensive

Our experience with the CAIRE SeQual Eclipse 5 model:

The CAIRE SeQual Eclipse 5 stands out for its adjustable oxygen delivery. With CAIRE’s autoSAT® Technology, users can customize the pulse dose to match their needs. 

It delivers oxygen with both continuous flow and pulse dose systems. In continuous flow, it operates with six settings, 0.5 to 3.0 LPM, adjustable in 0.5-liter additions. When you switch it to pulse dose, you get 9 settings.

From setting 1 to 6, you get 16 to 96 ml/breath by adjusting in 8 ml increments. From settings 7 to 9, the oxygen delivery is between 128 to 192 ml/breath with increments of 32 ml. 

Features like alterable bolus rise time and trigger sensitivity let you fine-tune the device to match your breathing pattern. A bolus rise refers to the increase in the concentration of a substance in the bloodstream, in this case, pure oxygen. 

This adjustability makes the Eclipse 5 a versatile option for users who need tailored oxygen therapy. It also works on both AC and DC power supplies.

Just like most other POCs, you also require a prescription to buy one.

5. ReadyO2 Pro

readyo2 pro 220220
Price: $1,990

ReadyO2 Pro

  • Weight: 4.37 lbs.
  • Dimension: 7.2’’×3.4’’×7.8’’
  • Battery life: 4.5 Hrs
  • Oxygen Concentration: 96%
  • Sound level: 48 dBA*
  • Altitude: Up to 16,400 feet
  • Flow settings: Pulse dose (5 settings) 200 ml-1000 ml/min
  • Warranty: 2 Years on unit, 1 year on power supply, battery, & sieve
Product star rate (1)
It offers a range of prices to fit a wide audience.
AC and DC power support
Compact and lightweight
Affordable
Quiet Operation
Limited flow settings compared to other models

Our experience with the ReadyO2 Pro model:

Starting us of on the best portable oxygen concentrator quiet devices is the ReadyO2 Pro model.

We found this device to be compact and lightweight, with an impressively low operating volume of only 48 dB. From a better perspective, this is about the same as light rainfall in a calm room. 

This is probably because of its CECA Oxygen Molecular Sieve technology. According to a 2023 study, this tech offers:

  • High oxygen purity and efficiency at 90%+
  • Reliability.
  • Low cost.

A 2023 study shows that these sieves operate at noise levels lower than 55 dB (similar to a quiet office environment). The lower numbers might be because the system uses an automatic multi-filter system. 

You’ll also be glad to know that it delivers oxygen every 4 seconds until it detects your breath, averaging about 12 to 20 breaths per minute. The copper compressor is energy-efficient but still powerful, and the LCD screen keeps you updated on oxygen flow and battery life. 

Plus, with DC charging, you can easily recharge on the go. At low noise levels, you can use it in the office, library, or even while driving without any distractions.

Quite Portable Oxygen Concentrator Comparison Chart

Each of the five portable oxygen concentrator quiet devices has its pros and cons, fitting different settings. Below is a table that shows you a comparison of the five we just looked at.

Quite-portable-oxygen-concentrator-comparsion-chart

How to Test and Choose the Right Quiet Device

Decibel Rating

When selecting a quiet POC, the first thing to do is check its decibel rating, which is noted as dB or dBA. So what is the difference?

  • dB is a straightforward measurement of sound pressure levels without accounting for the human ear’s sensitivity to sound.
  • dBA is a measurement that is modified to account for the human ear's sensitivity, filtering out some lower and higher frequencies.

Of the two, dBA is more tailored to human hearing and is, therefore, a more accurate representation of how we perceive noise. However, dB readings might differ from person to person since we might have different ear sensitivities.

A higher decibel count means a higher volume. So, anything below 50 dB is a hush device, and it will not cause any disturbance. If it falls between 70-90 dB, it's loud because it is equivalent to a loud office or a busy street.

User Reviews

Don’t stop there, though. Also, dive into user reviews on testimonials left behind by past users on trusted sites. These give you a better insight into the device's real-world usage besides what the brand offers, which can sometimes be exaggerated.

If possible, give the brand a test run. You can diverge into renting solutions before committing, which lets you test out the POC in different settings. Testing is vital because a dead-silent POC in an office might sound different from that in a library.

Maintenance Tips for Keeping Your Device Quiet

Sometimes, users come later and complain that a previously quiet POC is now making noise. So, what could be the issue?

For one, that could be improper maintenance and care.

To do it right, here are a few tips:

  • Regularly clean the exterior of the device.
  • Clear out any dust build-up in the vents because it can strain the device and cause it to increase noise.
  • Always check and replace the filters as the manufacturer recommends.
  • Inspect for any loose parts—screws and detachable components—as they might cause extra vibrations.
  • If you drop your unit and hear moving parts inside, consult the manufacturer for fixes.

Conclusion

Now, finding and maintaining a portable oxygen concentrator device should become a breeze. 

It's straightforward: check decibel levels, check user reviews, and test whenever you can.

Maintaining, cleaning, storing, replacing filters, and tightening moving parts helps. This will ensure your portable oxygen concentrator remains quiet for years.

The best part is that you have a couple of brands to select, each matching a different setting. Quiet comfort starts with smart choices and simple upkeep!

Sources

I am Dr. Jonathan Reed, a proud member of the readyO₂ team. With a background in respiratory therapy, I’m dedicated to helping those in need by answering questions and providing clarity. I strive to educate and inspire our audience by making complex topics accessible and engaging. My goal is to educate and inspire our audience, ensuring they have the information necessary to make informed decisions about their health. It’s a privilege to support individuals on their journey to better breathing and well-being.

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