Inogen One G4 Oxygen Concentrator

Inogen One G4 Portable Oxygen Concentrator

Oxygen Therapy at home and on a Go with the Inogen One G4 Portable Oxygen Concentrator

Inogen One G4 is a light and compact portable oxygen concentrator for home use, at work or during travel. If you undergo regular oxygen supplementation therapy, then the Inogen One G4 Oxygen Concentrator is for you! Inogen One G3 enables you to have your normal oxygen therapy anytime and anywhere as you need. The latest model of Inogen One Portable Oxygen Concentrators, the Inogen One G4 is the state of art device.      

Inogen One G4 works from its double 8 cell battery pack for up to 6 hours, giving you time to enjoy your chosen activities away from home, including when travelling on different types of transport (i.e. car, bus, ship or aircraft).  

Inogen One G4 is light and compact with slimline outline. It is easy to use and light to carry. Inogen One G4 dispenses pulsed concentrated oxygen flow of up to 3 litres per minute via nasal cannula.  Weighing just 1.27 kg when fitted with single battery, the Inogene G4 is the lightest concentrator on the market.   

Please note that the Inogen One G4 is not intended to be life sustaining or life On supporting. It is intended to provide oxygen therapy by delivering supplemental oxygen via nasal cannula.

Using the Inogen One G4 Portable Oxygen Concentrator

Inogen One G4 is battery powered with a choice of battery sizes – the standard single battery (i.e. 4 cell battery) has up to 3 hours of operation time when fully charged and a double battery (i.e. 8 cell battery) gives up to 6 hours of operation time from fully charged. The batteries recharge, when the battery is installed in the Inogen One G4 unit and the device is connected to AC or DC power source. Recharging time is circa 3.25 hours for a single battery and 6 hours for a double battery.

When used with AC power source, the concentrator automatically adapts to input voltage of between 100 V - 240 V (50-60 Hz), making the Inogen One G4 usable throughout the world. The DC power cable is designed to connect directly to cigarette lighters in cars or to auxiliary DC power supplies.

Easy to use and reliable, the Inogen One G4 Portable Oxygen Concentrator dispenses oxygen anytime and anywhere at the turn of a button. There are 3 oxygen flow control settings that can control the flow easily with control buttons (+ and -) from 1 – 3 litres per minute. Operating in the normal mode, the G4 concentrator delivers fixed volume of oxygen defined by the oxygen flow setting you have selected.    

Equipped with Breath Detection Alert Mode (i.e. automatic mode), the Inogen One G4 gives audible and visual warning signals, if no breath is detected for 60 seconds, whilst continuing to deliver oxygen at a fixed rate of 17 bursts of oxygen per minute (i.e. 17 bolus per minute) until breathing is detected. Upon detection of breathing, the device switches back to the normal mode and dispenses oxygen upon inspiration via the nose at a fixed volume of oxygen determined by the oxygen flow setting (i.e. settings 1 – 3 / 1 – 3 litres per minute) selected by the user.  

When the nasal cannula is positioned on your face and you breathe through the nose, the Inogen One G4 senses the onset of your inhalation and dispenses a burst of oxygen precisely at the time of your nasal inspiration. Thereafter, the Inogen One G4 senses each of your breaths and continues to deliver oxygen in perfect harmony with your breathing. As the Inogen One G4 senses and monitors your breathing patterns throughout its operation, it delivers oxygen accordingly, even if your breath becomes irregular. 

Display screen displays information about flow setting, power status, battery life and errors detected. There is backlight for easy reading, which illuminates the screen for 15 seconds, when on/off button is pressed. A yellow indicator light and a beep indicate changes in operating status or an arising condition that requires your action.

Caring for your Inogen One G4 Portable Oxygen Concentrator

Inogen One G4 is easy to maintain. No special maintenance - other than weekly cleaning of particles filter - is required. Weekly cleaning of particle filter ensures ease of air flow. To clean the particle filter, simply follow the instructions in the user manual.

You will also need to replace the output filter that protects the user from inhalation of small particles each time the device is to be used by a different user.

If you are using the DC input cable and the concentrator does not power up, you may need to replace the fuse located in the plug. 

User manual enclosed with the Inogen One G4 is comprehensive, but easy to understand and illustrated. It also contains advice on using the G4 concentrator on different types of transport and how to maintain the unit.  Should you have any further questions, please do not hesitate to contact us. You should also contact us before embarking on replacing of any parts or performing filter changes. You can call us for free on the Freecall number 0808 168 5522. International customers, please call + 44 1835 864866.  

The Inogen One G4 is a Class 2a Medical Device (CE 0473). Inogen One G4 carries 3 years warranty on the main unit and 1-year warranty on the battery. Expected life for the Inogen One G4 Oxygen Concentrator is 5 years and the batteries are expected to work for 500 full charge/discharge cycles. The sieve beds (metal columns) have expected life of 1 year.  Made in USA by Inogen, Inc.

Please contact us for advice or to order replacement parts on Freecall 0808 168 5522 (+ 44 1835 864866 international).  

Inogen One G4 Portable Oxygen Concentrator specifications

  • Model: G4
  • Warm up time: 2 minutes
  • Noise: 40 dBA (on setting 2)
  • Oxygen concentration: 90 - 3% / + 6% at all settings
  • Flow control settings: 3 settings: 1 to 3 litres per minute
  • AC Power Supply: AC input: 100 to 240 VAC/ 50 – 60 Hz; Auto-Sensing 1.0A
  • DC Power Supply: DC Power Cable: DC Input: 13.5 – 15.5 VDC, 10A Max.
  • Rechargeable Battery: Voltage: 12.0 to 16.8 VDC
  • Battery Duration: Up to 3 hours with single battery; Up to 6 hours with double battery  
  • Battery Charging Time: Up to 3 hours for a single battery; Up to 6 hours for a double battery 
  • Dimensions:  15.01 (L) x 6.8 (W) x 16.3 (H) cm / Weight: 1.27 kg with single battery 
  • Environmental conditions for use: 5 to 40° C; 0 to 95% non-condensing humidity, Altitude 0 to 3048 metres
  • Environmental conditions for shipping and storage: - 25 to 70° C; 0 to 95% non-condensing humidity, Altitude: 0 to 3048 metres
  • Class 2 a Medical Device (CE 0473)
  • 3 years warranty on the main unit; 1-year warranty on the battery

Warnings, cautions and contraindications

  • Inogen One G4 is an oxygen supplementing device and is NOT intended for life support or to sustain life!
  • As Inogen One G4 is powered by rechargeable batteries, you should ensure that you have an alternative source of oxygen, in case of power cuts or mechanical failure.
  • To ensure safe installation and operation, you must read user manual in its entirety prior to first use and retain the manual for future reference.
  • You must always follow all recommendations, warnings, cautions, pre-cautions and contraindications listed in user manual. 
  • The device produces concentrated oxygen gas that accelerates combustion. You must use it with extra caution to prevent any possibility of fire. You must not use it when smoking, near open flames, radiant heaters, aerosols, petroleum, oils, etc.
  • Use only water based lotions and salves that are compatible with concentrated oxygen.
  • Do not leave nasal cannula on fabrics, upholstery, bedding or clothing, when the oxygen concentrator is on as this can make materials flammable. Always turn off the concentrator, when not in use.

Inogen One G4 Portable Oxygen Concentrator – your smallest and lightest companion in oxygen therapy at home and on a go!  

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UK Shipping Schedule and Costs

UK delivery speed and cost are selectable in the Checkout. All orders are shipped in plain discreet packaging.

  • UK Regular Delivery (£4.50 + VAT):
    Delivery in 2 - 3 working days. Orders must be received before 2 pm (Monday – Friday).
  • UK Next Day by Courier (£7.50 + VAT):
    Next Day Delivery by Courier for orders received before 2 pm on working days (Monday to Friday) - expect delivery on next working day (Monday to Friday).  
  • UK Free Delivery Option for online only orders of £50.00 excluding VAT or more:
    UK Free Delivery Option for online only orders of £50.00 excluding VAT or more is free and takes approximately 5 - 6 working days. Purchases shipped with Free Delivery cannot be tracked!
  • UK Saturday Delivery (£13.50 + VAT):
    Saturday Delivery applies only to the UK Mainland Only. Saturday Delivery Orders must be placed before 2 pm on the Friday. Orders received after 2 pm on Friday will be delivered on Saturday next week.    

Overseas Shipping Schedule

  • Overseas deliveries take approximately 7 - 14 working days depending on destination.
  • Shipping costs depend on the type of goods and the delivery address.
  • Cost of shipping is shown in the Checkout prior to the completion of the purchase.
  • VAT is removed automatically from all purchases for deliveries outside the EU.  
  • Customs Fees or Import Duties may be charged in the country of destination outside the EU. If such charges apply, they are the customer’s responsibility. Custom Fees or Import Duties do not apply to deliveries to EU countries.  



Dimensions:  15.01 (L) x 6.8 (W) x 16.3 (H) cm / Weight: 1.27 kg with single battery  


Inogen One G4 kit consists of 1 oxygen concentrator unit, 1 x battery (as selected Single or Double), AC and DC power supply units, nasal cannula, carry bag with shoulder straps and user manual. CE 0473, 3 years’ warranty on the main unit, 1-year warranty on the battery.  

Please note that the AC power supply cannot be used to recharge the Inogen One G4 battery on an aircraft.       

Please note: As oxygen concentrators, should be used only when recommended or prescribed by a doctor, we will require a declaration of your condition and need for oxygen at home at the time of purchase. This will simultaneously entitle you to a VAT relief. You will be able to complete this online at the Checkout.   

UK customers please note: Deliveries to UK addresses can take up to 7 working days. Please select Free Shipping Option at the Checkout.