Inogen One G4 Portable Oxygen Concentrator

Brand/Manufacturer: INOGEN
For Questions, Please Call...
Item # Desc Pkg Price
IS-400-NA G4 With 4 Cell Battery $135.60
IS-400-NA8 G4 With 8 Cell Battery $196.10


If you have any questions on this product, Click Here to reach out to our staff Respiratory Therapist.

Inogen One G4 Oxygen Concentrator is used by patients requiring supplemental oxygen. It supplies a high concentration of oxygen and is used with a nasal cannula to channel oxygen from the concentrator to the patient. Inogen One G4 delivers the independence of a portable oxygen concentrator in one of the smallest, lightest and quietest packages available to the oxygen user. It provides flow settings from 1-3. Inogen One G4 may be used in home, institution, vehicle and various mobile environments.

Inogen One G4 Oxygen Concentrator Includes

  • AC power supply
  • DC power cable
  • Lithium ion battery up to 3 hours run time
  • Carry strap
  • Carry bag

Inogen One G4 Portable Oxygen Concentrator Features

  • Pulse dose delivery system with three flow settings 1, 2, 3
  • Duration of single battery is up to 3 hours and requires 3.25 hours of recharge with AC or DC power
  • Duration of double battery is up to 6 hours and requires 6 hours of recharge with AC or DC power
  • Unbelievably compact and lightweight
  • 40% lighter and half the size than Inogen One G3
  • Ultra-quiet operation
  • Intelligent oxygen delivery
  • Dramatically increases independence for most users 24/7
  • Designed to meet the clinical needs of greater than 85% of patients
  • Can easily be carried over the shoulder, worn on the hip or belt, or carried in a convenient backpack
  • Equipped with standard intelligent delivery technology to ensure the unit detects the breath to deliver the oxygen with incredible accuracy
  • Single battery system is used
  • Can be charged using a charged battery or by plugging it into the AC or DC power supplies
  • Provides freedom of oxygen anytime anywhere by allowing it to be charged at home or on the go
  • Has an upgraded LCD screen and large push buttons to make operating the machine easy
  • Low maintenance required

Inogen One G4 User Manual

Important Parts:

Inogen One G4 Oxygen Concentrator

What to buy with Inogen Oxygen Concentrator?

How to use Inogen One G4 Oxygen Concentrator?

Inogen One G4 User Interfaces

  • Display: This screen displays information regarding flow setting, power status, battery life and errors.
  • Indicator Lights: A green light indicates breath detection. A yellow light indicates either a change in operating status or a condition that may need response (alert). A flashing light is higher priority than non-flashing.
  • Audible Signals: An audible signal (beep) indicates either a change in operating status or a condition that may need response (alert). More frequent beeps indicate higher priority conditions.
  • Backlight: A backlight will illuminate the screen for 15 seconds when the on/off button is briefly pressed.

How to Operate Inogen One G4 Portable Oxygen Concentrator?

  1. Place the Inogen One G4 in a well ventilated location. Air intake and exhaust must have clear access. Locate the Inogen One G4 in such a way that any auditory alerts may be heard. Always operate the Inogen One G4 in an upright position.

  2. Operating Inogen One G4

  3. Ensure particle filter is in place. Do not operate the Inogen One G4 without the particle filter in place. Particles drawn into the system may damage the equipment.

  4. Operating Inogen One G4

  5. Install the battery. Insert the Inogen One G4 battery by sliding battery into place until the latch returns to the upper position.

  6. Operating Inogen One G4

  7. Connect the Power Supply. Connect the AC input plug to the power supply. Connect the AC power plug to the power source and connect the power output plug to the Inogen One G4. The green LED on the power supply will be illuminated and a beep will sound from the concentrator.
  8. Connect the nasal cannula tubing to the nozzle fitting. Nozzle fitting is located on the top of the Inogen One G4. Use of a single lumen cannula up to 25 feet in length is recommended to ensure proper breath detection and oxygen delivery. Additional titration may be needed to ensure proper oxygen delivery when using a particular cannula.

  9. Operating Inogen One G4

  10. Turn on your Inogen One G4 by pressing the ON/OFF Button. A single short beep will sound after the Inogen logo is displayed. “Please Wait” will appear while the portable concentrator starts up. The display will indicate the selected flow setting and power condition. Following a brief start-up sequence, a warm up period up to 2 minutes will initiate. During this time period the oxygen concentration is building to but may not have reached specification. Additional warm up time may be needed if your Inogen One G4 has been stored in extremely cold temperatures.
  11. Set the Inogen One G4 Concentrator to the flow rate prescribed by your physician or clinician. Use the + or – setting buttons to adjust the Inogen One G4 to the desired setting. The current setting can be viewed on the display.
  12. Position the nasal cannula on your face and breathe through your nose. Inogen One G4 will sense the onset of inhalation and deliver a burst of oxygen at a precise time when you inhale. The Inogen One G4 will sense each breath and continue to deliver oxygen in this manner. As your breathing rate changes, the Inogen One G4 will sense these changes and deliver oxygen only as you need it. A green light will flash each time a breath is detected. Make certain that the nasal cannula is properly aligned on your face and you are breathing through your nose.


  • This device is not intended to be life sustaining or life supporting.
  • Under certain circumstances, the use of non-prescribed oxygen therapy can be hazardous. This device should be used only when prescribed by a physician.
  • Additional monitoring or attention may be required for patients using this device who are unable to hear or see alerts or communicate discomfort. If the patient shows any signs of discomfort, a physician should be consulted immediately.
  • Inogen One G4 is not designed or specified to be used in conjunction with a humidifier, nebulizer or connected with any other equipment. Use of this device with a humidifier, nebulizer or connected with any other equipment may impair performance and/or damage the equipment. Do not modify the Inogen One G4 Concentrator. Any modifications performed on the equipment may impair performance or damage equipment and will void your warranty.

Precautions to take while using Inogen Oxygen Concentrator

  • The device produces enriched oxygen gas, which accelerates combustion. Do not allow smoking or open flames within 10 feet of this device while in use.
  • Do not submerse the Inogen One G4 or any of the accessories in liquid. Do not expose to water or precipitation. Do not operate in exposed rain. This could lead to electrical shock and/or damage.
  • Do not use oil, grease, or petroleum-based products on or near the Inogen One G4.
  • Never leave the Inogen One G4 in an environment which can reach high temperatures, such as an unoccupied car in high temperature environments. This could damage the device.

Inogen One G4 Specifications

Height7.2" (Includes Single Battery)
Oxygen FlowPulse dose delivery system
Three flow settings 1, 2, 3
PowerAC Power Supply 100-240V, 50-60Hz  (auto sensing to allow worldwide use)
DC Power Cable: for mobile use in car
BatteryDuration (single battery): Up to 3 hours
Recharge up to 3.25 hours with AC or DC power
Duration (double battery): Up to 6 hours
Recharge up to 6 hours with AC or DC power
Noise Level40 dBA (At flow setting 2)
Operation Simple control functions and easy-to-read LCD display
Use Designed for 24/7 use
Weight 2.8 lbs. (Includes Single Battery)

Inogen G4 Warranty

3 Years Warranty

Customer Reviews


ItemName - now     10/20/2021

  Your question will show here once it will get approved.

UserName - now     10/20/2021

  Your Answer will show here once it will get approved.



Enrique Herrera     05/02/2019

Does it works at 4000 meters.?..?


Customer Care    05/09/2019

"Inogen One G4 Portable Oxygen Concentrator can work upto 3048 meters. "



Marjorie J Schnapp     05/22/2017

is there an advantage in buying the 8 cell battery?


Customer Care    05/23/2017

Inogen One G4 Oxygen Concentrator with One Double Battery (8 cell battery) weighs only 4 lb (concentrator, batteries, carry case and cart). The battery Duration is up to 6 hours (fully charged batteries at pulse flow setting 2) and the battery Recharge Time is up to 6 hours.



Illiana     04/13/2017

How should I clean the case?


Customer Care    04/14/2017

You may clean the outside case using a cloth dampened with a mild liquid detergent (such as Dawn) and water.



Shailley     04/13/2017

How to use it with AC Power?


Customer Care    04/14/2017

For operation of the power supply using an AC power source, follow these instructions:

  • Connect the AC input to the power supply.
  • Connect the AC power plug to the power source and connect the power output plug to the Inogen One G4. The green LED will be illuminated, indicating the power supply has input power.



Karen     11/22/2016

Do you have a carrying bag in a color other than black?


Customer Care    11/23/2016

Inogen One G4 Oxygen Concentrator carry bag is available in Black color only.



Doyle     11/20/2016

what is the max/min air flow on Inogen one g4


Customer Care    12/14/2016

Please refer to below chart for max/min air flow on Inogen one g4.

Flow setting Flow Rate               (ml/min +/- 3%) 10 BPM                    (ml +/- 10% or 3ml) 17 BPM                    (ml +/- 10% or 3ml) 25 BPM                            (ml +/- 10% or 3ml)
    min nominal max min nominal max min nominal max
1.0 210 18.0 21.0 24.0 9.4 12.4 15.4 5.4 8.4 11.4
2.0 420 37.8 42.0 46.2 21.7 24.7 27.7 13.8 16.8 19.8
3.0 630 56.7 63.0 69.3 33.4 37.1 40.8 22.2 25.2 28.2


{{x.ShortDescription}} ...

What is HPFY’s return policy?

Customer satisfaction is our top priority. We stand behind our products. If the merchandise you received is defective or not what you expected it to be, and you wish to return the item, please submit a return request in the My Account section of our website, contact our Customer Service department at (866) 316-0162 / (203) 616-2850 or email us.

  1. Merchandise must be returned within 30 days of the receipt of your order. Returns are not accepted after 30 days.
  2. Items (including parts and accessories) must be returned in new, unused, and resalable condition in its original packaging.
  3. Before returning any product, the buyer must obtain a Return Authorization Number (RA#) from a customer service representative. With your RA# you will receive a prepaid return shipping label.
  4. Orders returned without obtaining an RA# will be entitled to receive only "In-Store Credit" that can be used towards future purchases.
  5. Return orders are subject to a 20% restocking fees.
  6. All custom orders and hygienic items are non-returnable. Refer to the “Non-Returnable Items” section for further details.
  7. Returns will be reviewed and inspected before issuing credit. Please allow 3 to 4 weeks for processing. The credit will be applied to your original method of payment.
  8. If the return is the result of a defective product or shipping error, we will refund the entire purchase amount and return shipping costs.

Which products are Non-Returnable?

Due to the hygienic nature of some items, they are non-returnable. The items listed below are non-returnable:

  1. All hygienic items.
  2. Opened personal care items.
  3. Anything opened, used, or tried on.
  4. All customized items.
  5. Besides these, items that have the “non-returnable” phrase on the website.

We reserve the right to make adjustments due to errors, changing market conditions, product discontinuation or typographical errors in advertisements. Images on the site may not always reflect the actual product. Footrests or leg-rests are not included with wheelchairs unless specified.

How do I receive a return authorization number?

You can submit a return request by logging into your account. You will receive the Return Authorization Number (RA#) details in the email within 2-3 business days.

  • Login to your account
  • Go to “order history”
  • Click on “return order”
  • Fill out the return form and Submit it

If you do not have an email address, we will make other accommodations for RA# Details. Write the RA# on your label affixed to your package prior to shipment.

How long does it take to receive a refund?

Please allow 3 to 4 weeks to process the returns. Once the item is received, and inspected, your refund will be processed and automatically applied to your credit card or original method of payment.

Is there any Restocking Fees?

  1. 20% restocking fees will be applied.
  2. Outbound shipping cost is non-refundable.
  3. For orders that qualified for free shipping, $8.99 will be deducted from the refund if the product is returned.

Inogen Accessories

{{'Buy ' + x.Name}}
${{ x.OurPrice | currency: "" : 2}}
Please enter your and your friend's email address below.
Fields marked with * are compulsory

Submit Cancel
The selected product information along with Reward Dollar coupon code has been successfully emailed to you and your friend.

Thank you for using