At a glance
Choosing a chamber means thinking beyond its price and pressure rating. You need to know how people will use it, how high-purity medical oxygen is supplied and who will look after it. FINK brings these parts together in a system planned for regular use in a fixed location.
About this guide
HBO₂ Health works with FINK Engineering on chamber sales and helps buyers worldwide work through model selection and installation requirements.
1. Built around standards for people under pressure
A hyperbaric chamber needs to do more than hold compressed air. It needs to be designed for the people inside it.
FINK designs its compact chambers to ASME PVHO-1, a standard for chambers that people use under pressure. This standard covers how chambers for human use are built, inspected and tested. For a buyer, it gives a clear basis for checking the quality of the proposed equipment. FINK Trio specifications, the ASME standard explained.
Ask for the chamber's inspection records and certificates, along with confirmation that the exact model can be supplied and used for your purpose in your country.
FINK lists Mayo Clinic, Cleveland Clinic and the US Air Force among its installations, and The Brain & Performance Centre in Dubai among its projects. That experience is useful when a project needs the chamber, building work and supporting equipment to come together. FINK's completed projects.
2. A separate oxygen supply for each user
Inside FINK's compact chambers, compressed air raises the pressure around you. You breathe high-purity medical oxygen through a mask connected to a separate supply. For the FESL installations we support, we recommend medical oxygen in cylinders, often called tanks. As one example from the FESL line, the three-seat FESL-323 (Trio) uses oxygen cylinders with an automatic system that switches between them. How FINK's home chambers work, Trio oxygen-supply features.
This arrangement also allows a person to take breaks from breathing oxygen, if their doctor prescribes them, while the chamber stays at the same pressure.
For a home or clinic planning regular sessions, the practical question is how that oxygen will be delivered, stored and replaced. Discuss this early so the supply works with your location and schedule.
A standard concentrator is not a substitute for the prescribed near-100% oxygen supply. A properly fitted mask and enough flow are also needed to deliver the intended concentration. Our medical oxygen guide explains the difference and what to check.
3. Safety features for problems that need a quick response
FINK's Trio includes a water-spray fire-suppression system, backup power and controls inside and outside the chamber to release pressure in an emergency. These give the operator ways to respond to a fire, a power cut or a session that needs to end early. FINK Trio safety features.
These features matter to anyone installing a chamber for regular use, especially at home where there may be no wider clinical team nearby. They should be demonstrated when the chamber is installed.
Safe use also depends on people. A trained operator needs to stay present throughout the session. Suitable clothing, checks before use and regular servicing are part of the routine. FDA guidance on safe chamber use.
4. A choice of one, two, three or four seats
The FINK FESL line offers four seating configurations: one seat, two seats, three seats and four seats. The three-seat FESL-323, also called the Trio, is one model in that range. For someone who can enter without a stretcher, sitting in a chair may be preferable to lying on a stretcher that slides into a tube.
The Trio has large windows and a continuous supply of fresh air. An optional chair that swivels and slides can help with getting in and out. Try the seating and entry arrangement before choosing a model, particularly if mobility is a concern. FINK Trio seating and access.
Multiple seats can also suit a clinic or hotel planning supervised sessions for more than one person. Each user still needs a suitable treatment plan, and shared sessions need compatible pressure settings.
5. Help fitting the chamber into your property
Getting a large chamber into an existing room can be a challenge. FINK offers designs that can be brought in as separate sections and assembled on site. This can help with routes where a complete chamber would be difficult to move through. The installer needs to check the actual doorways and route first. FINK Trio installation details.
The room also needs to support the chamber's weight and have space for its equipment and oxygen supply. The Trio weighs ~2,900 kg, so checking the floor is essential.
FINK offers installation, checks before first use, servicing and technical support. For homeowners and businesses, this provides a way to get help with the equipment after delivery. Before ordering, agree who will install and service it locally, what training is included and how repairs will be handled. FINK's installation and support services.
How the options compare
Two numbers decide the oxygen dose: the pressure in the chamber and the purity of the oxygen you breathe. Lower either one and the dose drops.
In 2026 the Undersea and Hyperbaric Medical Society set out what counts as hyperbaric oxygen treatment, or HBO₂. It has to be prescribed and supervised by a physician. It takes place in a hard chamber built to ASME PVHO-1 and NFPA 99, at no less than 2.0 ATA, with medical oxygen above 99% purity. UHMS position statement.
That definition is a useful test for any chamber you are considering.
| Type of chamber | Pressure | What you breathe | Meets the UHMS definition |
|---|---|---|---|
| Soft, inflatable chamber | Around 1.3 ATA | Air, or oxygen from a concentrator | No. The pressure is too low. In the US these are cleared for acute mountain sickness only. |
| Hard “mild” chamber | 1.3 to 1.5 ATA | Oxygen from a concentrator, typically 90 to 95% | No. Both the pressure and the oxygen purity fall short. |
| Oxygen-filled monoplace | 2.0 ATA and up | The whole cabin is filled with oxygen | Yes, when built to PVHO-1 and NFPA 99. One patient, lying down. |
| FINK FESL | Up to 2.0 ATA | 100% medical oxygen through a mask. The cabin is filled with air. | Yes, at 2.0 ATA with physician-prescribed and supervised treatment. One to four people, seated. |
Concentrators are a common shortcut. Even a medical-grade concentrator supplies around 93% oxygen, which is below the UHMS bar. Our medical oxygen guide explains why.
FESL chambers deliver oxygen at up to 2.0 ATA, the minimum pressure in the UHMS definition. Some emergency indications, such as decompression sickness and gas embolism, are usually treated at higher pressures in hospital chambers. The doctor prescribes the pressure for each patient.
Discuss your FINK project
Contact HBO₂ Health with your location, whether the chamber is for a home, clinic or hospitality business, how many people it needs to accommodate and your timeframe. This helps identify the right model and what your property will need. If you are also considering clinical care, HBO₂ Health can arrange a separate introduction to Dubai's Brain & Performance Centre.
Specifications and availability are confirmed per project in FINK’s written proposal.
Common questions
How many seats does the FINK FESL line offer?
The FESL line comes in one-seat, two-seat, three-seat and four-seat configurations. The FESL-323 (Trio) is the three-seat model used as an example in this guide. Tell us how many people you want the chamber to seat so we can discuss the right configuration.
Is the FESL chamber FDA cleared?
Yes. The one- to four-seat FESL chambers (FESL-310, 322, 323 and 324) are supplied under FINK's FDA 510(k) clearance K240569, granted on 21 November 2024, as prescription medical devices for the 13 conditions listed in the clearance. The FDA summary describes FINK's chamber family by compartment rather than by seat count, which is why it mentions capacities of four to 28. We send the clearance letter with every proposal.
Is more pressure always better?
No. The doctor prescribes the treatment pressure. FESL chambers deliver oxygen by mask at up to 2.0 ATA, the minimum pressure in the UHMS definition. The 2.8 ATA operating rating and 3.0 ATA design rating describe the vessel, not a treatment setting.
What costs should I allow for beyond the chamber?
Allow for delivery, import charges, room preparation and the oxygen supply. Include operator costs and training, then regular servicing, replacement items and repairs. Ask what the warranty covers and whether a technician's travel is charged separately. Comparing these costs will give you a more useful picture than comparing purchase prices alone.
Sources & further reading
- FINK Trio specifications
- the ASME standard explained
- FINK's completed projects
- How FINK's home chambers work
- FDA guidance on safe chamber use
- FINK's FDA clearance document
- Brain & Performance Centre
- UHMS 2026 position statement on terminology
- FINK FESL-310 specifications
This guide gives general information. Ask a qualified doctor whether treatment is right for you, what the risks are and what other options you have.