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Inogen One G3 Certified Pre-Owned portable oxygen concentrator – side view

Inogen One G3 Certified Pre-Owned – top view showing LCD display and controls

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Inogen One G3 (Certified Pre-Owned)

The Inogen One G3 — five pulse settings up to 1,050 mL/min, whisper-quiet at ≤39 dBA, 4.8 lb, up to ~10 hours on a 16-cell battery. A genuine, proven Inogen concentrator, Certified Pre-Owned, FAA-compliant & FDA-cleared.

Rated 5 out of 5 based on 2 customer ratings

(2 customer reviews)

From US$1,150 – US$1,250

Free shipping in the continental U.S.
Included in the price. No surprises at checkout.

✓ 1-Year Warranty by American Oxygen · plus immediate certified-unit swap if a covered issue arises — no 30-day factory wait.

Battery Option

Clear

Call (786) 755-8063

FAA compliantFDA clearedGenuine Inogen1-Yr Warranty by AO

5pulse settings (1–5)

1,050mL/min max output

4.8 lbwith single battery

up to 10h16-cell, setting 1

5pulse settings (1–5)

1,050mL/min max output

4.8 lbwith single battery

up to 10h16-cell, setting 1

5 pulse settings (1–5) · up to 1,050 mL/min · 4.8 lb
Up to 10h of battery (16-cell, setting 1)
FAA-compliant for air travel · FDA-cleared (prescription required)
Genuine Inogen unit · Certified Pre-Owned · 1-Year Warranty by American Oxygen

FAA compliantFDA clearedGenuine Inogen1-Yr Warranty by AO

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Brand: Inogen
SKU: IS-300
Category: Portable Oxygen Concentrator

Description
Reviews (2)

The proven Inogen, Certified Pre-Owned

The concentrator patients have relied on for years — at a lower price

The Inogen One G3 built Inogen's reputation: five pulse settings, whisper-quiet operation, and reliable oxygen therapy for daily life and travel. Certified Pre-Owned, it's a genuine G3 our technicians inspected and restored to manufacturer standards — and if a covered issue ever comes up, we swap it for another certified unit right away.

Genuine Inogen device. FAA-compliant for air travel and FDA-cleared. Prescription required. 1-Year Warranty by American Oxygen.

Why the Inogen One G3

Whisper-quiet, five settings

At ≤39 dBA the G3 is quiet enough for offices, flights and quiet homes, with five pulse settings for everyday oxygen needs.

Proven, reliable, everyday

The Inogen One G3 has a long, dependable service record you can lean on — five pulse settings for everyday oxygen needs, now Certified Pre-Owned at a lower price.

Immediate certified-unit swap

If a covered issue arises, we replace your G3 with another certified unit right away — no 30-day factory wait that new units often require.

Certified Pre-Owned, warranty by AO

A genuine Inogen G3 that passed full inspection, cleaning and diagnostic testing, backed by a 1-Year Warranty by American Oxygen.

Battery runtime by setting

Battery	Setting	Runtime
Single (8-cell)	2	~4.7 h
Double (16-cell)	1	up to ~10 h

Per-setting runtimes are American Oxygen estimates; Inogen publishes only the setting-1 maximum. Actual battery life varies with breath rate, altitude and battery age.

Details

Technical specifications

Flow type	Pulse dose only (no continuous flow)
Flow settings	5 (settings 1–5)
Max oxygen output	1,050 mL/min (5-setting version)
Oxygen concentration	90% ±5.5% / –3% across settings
Weight	4.8 lb with single battery (double-battery weight not published by Inogen)
Dimensions	8.25 (H) × 3.0 (W) × 8.75 (D) in with single battery; 7.25 in tall without battery
Battery options	8-cell (single) or 16-cell (double)
Battery life	Up to ~4.7 h single / up to ~10 h double (16-cell)
Sound level	≤39 dBA
Connectivity	No Bluetooth / app (earlier Inogen model)
Power	AC 100–240V · DC 13.5–15.5V vehicle adapter
Air travel	FAA-compliant · FDA-cleared
Warranty	1-Year Warranty by American Oxygen + immediate certified swap
Condition	Certified Pre-Owned — factory-tested & restored

Warranty & condition

1-Year Warranty by American Oxygen · plus immediate certified-unit swap if a covered issue arises — no 30-day factory wait.

In short

The Inogen One G3 Certified Pre-Owned is a genuine, pulse-dose portable oxygen concentrator with five flow settings (1–5), up to 1,050 mL/min, whisper-quiet operation (≤39 dBA) and about 4.8 lb of weight. With a 16-cell battery it runs up to roughly 10 hours, and it's FAA-compliant for flights. Certified Pre-Owned means a previously used unit that American Oxygen inspected, cleaned, reconditioned and tested to manufacturer standards, backed by a 1-Year Warranty by American Oxygen — with an immediate certified-unit swap if a covered issue arises. Prescription required.

Frequently asked questions

What does “Certified Pre-Owned” mean for this G3?

It's a previously used, genuine Inogen One G3 that our technicians inspected, cleaned, reconditioned and factory-tested to meet manufacturer standards — not a sold-as-is used unit. It ships with a 1-Year Warranty by American Oxygen, plus an immediate certified-unit swap if a covered issue arises.

How long does the battery last?

On the single battery, up to about 4.7 hours; on the 16-cell double battery, up to about 10 hours. Runtime varies with your breathing rate, altitude, temperature and setting.

Can I fly with the Inogen One G3?

Yes. This unit is FAA-compliant for commercial flights. Airlines typically ask for battery capacity equal to about 150% of your total flight time, so plan spare batteries accordingly.

What happens if it needs warranty service?

Because it's Certified Pre-Owned by American Oxygen, we can replace your G3 with another certified unit right away if a covered issue arises — avoiding the 30-day factory wait new units often require. Coverage is a 1-Year Warranty by American Oxygen.

Should I choose the G3 or the G4?

The G4 is smaller and lighter (about 2.8 lb, 3 settings) — best if minimal weight is the priority. The G3 is a bit larger but offers five settings and longer runtime options — a good fit if you want more flow range and battery life. Our team can help you match your prescription to the right one.

Do I need a prescription?

Yes. Portable oxygen concentrators require a prescription. Our team can help you complete your order once you have it.

Not sure this is your setting? We'll help you choose.

Talk to a specialist — we'll confirm the right concentrator and flow for your prescription.

Call (786) 755-8063

2 reviews for Inogen One G3 (Certified Pre-Owned)

5.0

Based on 2 reviews

100

100%

Rated 5 out of 5

Peter J. – 15 June, 2022

Good as new. Thank you
Rated 5 out of 5

Fred Johnson – 10 September, 2019

Best purchase I have ever made! Easy to use, and practically it doesn’t need any maintenance. I use it every day and it gives me the freedom I was looking for.