When people start researching hyperbaric oxygen therapy (HBOT), one of the first questions they ask is:
“Do I really breathe 95 % oxygen inside the chamber?”
It’s a great question – and the answer is yes, that’s exactly what our oxygen concentrators produce.
But the real magic happens because of pressure.
When you combine concentrated oxygen with mild hyperbaric pressure, your body can absorb more oxygen overall than it ever could at normal atmospheric pressure – even compared with breathing 100 % oxygen at sea level.
Let’s take a closer look at what that means and why it matters.
1. What Our Oxygen Concentrators Deliver
All of our systems use medical-grade oxygen concentrators built to the international performance standard ISO 80601-2-69.
These concentrators work by drawing in room air, removing nitrogen, and delivering a steady stream of 93 % ± 3 % oxygen at the outlet — in other words, around 90 – 96 % oxygen purity.
That’s why we (and every manufacturer who follows the same international standard) describe them as producing up to 95 % oxygen.
It’s the same specification used in hospitals and by home-oxygen providers around the world.
When that oxygen reaches you through a high-flow non-rebreather mask, the concentration you actually breathe in — called the FiO₂ (fraction of inspired oxygen) – is typically between 60 % and 90 %, depending on how well the mask seals and your own breathing pattern.
Even though that sounds lower than the outlet number, it’s completely normal.
And here’s where the hyperbaric chamber changes everything.
2. The Power of Pressure: Why You Still Get “100% Oxygen” Benefits
Under normal conditions at sea level (1 ATA), the air around us is about 21 % oxygen.
That’s what your body is used to processing every day.
Inside a mild hyperbaric chamber, the pressure is gently increased – usually to 1.3 – 1.5 ATA.
This small rise in pressure makes a big physiological difference, because it increases the partial pressure of oxygen (ppO₂) – the amount of oxygen that can actually dissolve into your blood and reach your tissues.
At 1.5 ATA, even if you were breathing plain room air, your oxygen availability increases by about 50 %, equivalent to breathing 31-32 % oxygen at sea level.
When you add oxygen from a concentrator (say 60 – 90 % through the mask), the math becomes even more impressive:
| Breathing Condition | FiO₂ | Pressure (ATA) | Resulting ppO₂ | Equivalent at Sea Level |
|---|---|---|---|---|
| 21 % air, 1 ATA | 0.21 | 1.0 | 0.21 | 21 % O₂ |
| 60 % O₂, 1.5 ATA | 0.60 | 1.5 | 0.90 | ≈ 90 % O₂ |
| 70 % O₂, 1.5 ATA | 0.70 | 1.5 | 1.05 | ≈ 105 % O₂ |
| 95 % O₂, 1.5 ATA | 0.95 | 1.5 | 1.43 | ≈ 143 % O₂ |
So, when you’re in a mild chamber breathing oxygen from a concentrator, your body is exposed to oxygen levels that can exceed those achieved by breathing 100 % oxygen at sea level.
That’s the power of partial pressure – and it’s the key principle behind all forms of hyperbaric therapy.
This relationship is described by Henry’s Law, a well-established scientific rule that states:
The higher the pressure, the more gas (in this case, oxygen) dissolves in a liquid (your blood plasma).
3. Why “95% Oxygen” Is a Fair and Accurate Claim
Some people wonder whether saying “up to 95 % oxygen” might be misleading, because the user isn’t inhaling a constant 95 % mixture.
In fact, the claim is entirely accurate – and here’s why:
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It reflects the true output of the concentrator.
The oxygen purity leaving the concentrator is up to 95 %, verified against the international ISO standard used by medical suppliers. -
It aligns with how oxygen therapy is described clinically.
Even in hospitals, concentrator or cylinder-fed systems are referred to by the oxygen purity they deliver, not the variable fraction a patient might inhale after mixing in air through a mask. -
It’s scientifically sound in the context of HBOT.
Because of the increased pressure, the effective oxygen exposure (ppO₂) your body experiences is the key metric — and that’s where the therapy truly delivers.
In many cases, ppO₂ values in mild hyperbaric sessions exceed what you could ever achieve breathing 100 % oxygen at sea level.
So, when we say our systems deliver “up to 95 % oxygen,” that’s exactly what the equipment produces, and when combined with mild hyperbaric pressure, it provides the same physiological oxygenation your body would get from full 100 % oxygen at normal pressure – or more.
4. What It Means for Your Session
During a session, the mild chamber pressurises gradually to the target level (usually 1.3-1.5 ATA).
As you breathe through the mask, oxygen enters your lungs and dissolves into your bloodstream – not just through red blood cells, but directly into the plasma as well.
That extra dissolved oxygen is what helps:
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Improve oxygen delivery to tissues
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Support circulation and cellular repair
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Promote recovery and relaxation
Even if you’re breathing a mixture of chamber air and oxygen, your total oxygen uptake is much higher than normal.
In other words, you’re not missing out by not breathing pure oxygen – the physics of pressure ensures you’re already getting all the oxygen your body can meaningfully use.
5. In Plain English
You can think of it like this:
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The oxygen concentrator supplies high-purity oxygen (up to 95 %).
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The chamber’s pressure helps your body absorb that oxygen more efficiently.
Together, they create the therapeutic environment that makes hyperbaric therapy so effective.
That’s why the numbers on paper – 93 %, 95 %, 70 % – matter less than what’s really happening in your body:
you’re getting a safe, comfortable, and powerful oxygen boost every time you step into the chamber.
6. Quick Summary
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Our oxygen concentrators meet ISO 80601-2-69, the global standard for medical concentrators.
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They deliver 93 % ± 3 % oxygen at the outlet — up to 95 %.
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Through a mask, users typically breathe 60 – 90 % oxygen, depending on fit and airflow.
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The pressure in a mild chamber (1.3–1.5 ATA) increases oxygen absorption by up to 50 % or more.
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The combination gives your body oxygen exposure equivalent to, or greater than, 100 % oxygen at sea level.
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This is why our “up to 95 % oxygen” statement is both accurate and backed by physics — not marketing.
The Bottom Line
Our oxygen concentrators are built to deliver exactly what they promise: up to 95 % oxygen purity, safely and consistently.
The mild pressure of the hyperbaric chamber amplifies that effect, allowing your body to absorb oxygen more deeply and efficiently than ever before.