An In-Depth Review on the Inogen One G4 Concentrator

At a weight of just 2.8 pounds including a single battery, the Inogen One G4 Portable Oxygen Concentrator, released in May 2016, has quickly become a favorite among oxygen users that wish to maintain their active lifestyles. Producing "more oxygen per pound of weight" than other oxygen concentrators currently on the market, according to Inogen, it is designed for continuous use—even while those using it are still on the move.

Overview of the Inogen One G4

  • Pulse Dose Delivery: 1-3 flow settings
  • Wearable Technology - Only 2.8 Pounds
  • Up to 5 Hours of Power with the 8 Cell Battery
  • Designed for 24/7 usage
  • FAA Approved for Flights
  • Includes the G4 unit, 8 cell battery, custom carry bag, carry strap, AC/DC power supply, cannula and manual.
Overview of the Inogen One G4

G4 Appearance

The Inogen One G4 is a powerful portable oxygen concentrator in a small package, measuring at only 7.2 inches high by 5.91 wide and 2.68 inches deep. Nearly half the size of the Inogen One G3, it is one of the smallest oxygen concentrators available. Its small footprint makes it easy to move anywhere around the home—it fits comfortably even on a countertop—but it’s also ideal for traveling and simply being active.

It's white rectangular casing, which is accented with some light blue details on the side and at the control panel, is smooth and unobtrusive to blend in with your surroundings, and the slightly rounded corners provide a sleeker appearance. The bright LCD display screen, located at the top of the machine for easy access, offers simple controls for efficient operation.

Excellent Oxygen Equipment

I absolutely love my Inogen G4 concentrator in every way possible. I will be buying the Inogen GS-100 for home use very soon. Great on-line company to work with also.

Review by James

G4 Portability

Dimensions: 5.91" Wide x 2.68" Deep x 7.2" High (including single battery)
Weight: 2.8 pounds with single battery
Battery Life: Up to 5 hours with 8 cell battery

As one of the smallest oxygen concentrators available, the Inogen One G4 was designed to be mobile. The unit comes with a sturdy, durable black strap and a black carrying bag for better handling outside the home, but the strap can be used without the bag for even less weight. It is one of the quieter machines at only 40 decibels, similar to a quiet indoor conversation.
The unit, which offers three different pulse flow settings, can accommodate a 4-cell battery and an 8-cell battery, with the following average battery duration per setting:

Setting 1
4-cell battery: 2 hours, 40 minutes
8-cell battery: 5 hours

Setting 2
4-cell battery: 2 hours, 15 minutes
8-cell battery: 4 hours, 30 minutes

Setting 3
4-cell battery: 1 hour, 20 minutes
8-cell battery: 2 hours, 30 minutes

The Inogen One G4 is approved by the FAA to travel on most airlines in the US, and with its small size, it is ideal for traveling. For trips longer than the unit’s 5-hour operation time, the single or double rechargeable batteries can provide up to 3 or 8 hours of additional battery time and recharge in under 3 or 6 hours, respectively. The AC power supply has an auto-sensor that allows the machine to be used worldwide—no converters necessary—further proving its suitability for traveling around the globe. A DC power cable allows for use in the car, making long road trips once again a possibility.

An In-Depth Look at the Inogen One G4 Mobile Oxygen Concentrator

The innovative Intelligent Delivery Technology, available in all Inogen One portable oxygen machines, delivers oxygen within 400 milliseconds after detecting a breath to ensure that the oxygen is used efficiently within the body. The technology can also automatically adjust the level of oxygen depending on your physical activity: when sleeping, the unit delivers oxygen more slowly. When exercising or engaging in some physical activity, the Inogen One G4 delivers oxygen in shorter, smaller bursts. Together, this makes an ideal oxygen concentrate for day and night.

G4 Controls

The control panel on the Inogen One G4 is conveniently located at the top of the machine, which is completely viewable and accessible when moving around. Just four buttons—easy to press, but not so easy that users accidentally do so—are used to operate the unit, and the LCD display shows how much battery power is left and which of the three settings the machine is on.

The particle filter, which keeps dust, pet hair, and other airborne contaminants away from the delivered oxygen, is located on one of the narrower sides of the unit. The filter can be removed easily with one hand; it is reusable but should be washed weekly.

Great equipment. Perfect for traveling - car or plane.

After only 2 years, of very occasional use - intermittent use on air and car travel only - one of my double batteries is completely dead and will not charge. I have two Inogen One-g4 POCs and three double and a single battery, to ensure that in remote areas to which I travel, I have a back-up machine and batteries. I require supplementary oxygen at level 2, intermittently, for about 6-10 hours a day. I have a constant flow machine at home in the bedroom and only use the G4 - as required, away from home - car, plane, etc.

Review by Richard

G4 Videos

Inogen One G4 Pricing:

The Inogen One G4 unit comes with a single lithium-ion battery, AC power supply, DC power cable, carry strap and carrying bag, cannula and a user manual. Additional batteries and replacement columns are also available. Please call us at 877.774.9271 to explore the various Inogen G4 purchasing options available.

Inogen One G4 Summary

The Inogen One G4 oxygen concentrator is truly portable. Small, efficient and quiet, the unit takes up little to no space and is light enough to use all day long—and with a battery that can last up to 5 hours, you just might. With this long-lasting, light and durable unit, oxygen therapy users are free to do anything they want—including traveling the world.

Updated: February 10, 2020
Published: January 12, 2017

About Scott Ridl: Scott joined American Medical Sales and Rentals in 2008 as a Web Manager and Content Writer. He is a writer and designer. He is extensively trained on oxygen therapy products from leading manufacturers such as Inogen, Respironics, Chart, Invacare, ResMed and more. Scott works closely with respiratory therapists and oxygen specialists to educate the community about oxygen therapy products, COPD, asthma and lung diseases. He writes weekly columns and is passionate about educating the community on oxygen therapy and respiratory issues.

2 thoughts on “An In-Depth Review on the Inogen One G4 Concentrator”

  • Thomas Kenney

    How much oxygen does g4 deliver per burst for level 1, 2 and 3

    • Sanket Jain

      Inogen One G4 generates oxygen in an increment of 210 ml/minute per setting.
      Setting of 1: 210 ml/min
      Setting of 2: 420 ml/min
      Setting of 3: 630 ml/min

      Oxygen delivery per bolus (or burst) depends on the breath rate. However, the total amount of oxygen delivered in a minute remains the same on the same setting. For example, at the setting of 1, if the concentrator is delivering 10 bolus per minute, then one bolus will contain 21 ml of oxygen. Whereas, if the concentrator is delivering 25 bolus per minute, then one bolus will contain 8.4 ml of oxygen. In both scenarios, the total oxygen delivered in a minute is 210 ml.

      The setting of 1 to 3 on Inogen G4 is comparable to the same setting on Inogen G3.


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