3A health · Equipment terminology guide · Sources checked 23 October 2026
A hyperbaric chamber quotation needs more than an occupancy or pressure number. Chamber pressure, oxygen supply and intended use describe different parts of a system. This guide explains the terms so buyers can ask for the right evidence before comparing equipment.
What does hyperbaric oxygen mean?
The FDA describes hyperbaric oxygen therapy (HBOT) as breathing 100% oxygen inside a chamber at higher-than-normal air pressure. Its HBOT device safety letter explains this medical-device context. A pressurized cabin alone does not establish an equivalent oxygen exposure or clinical use.
The Undersea and Hyperbaric Medical Society (UHMS) distinguishes prescribed, supervised clinical HBOT from low-pressure “mild” exposures, which it describes as unproven. Do not transfer clinical HBOT outcome claims to equipment with a different pressure, breathing-gas system or intended use.
Five specifications to keep separate
| Specification | What to verify | What it does not establish |
|---|---|---|
| Chamber pressure | The exact model’s working pressure, unit and absolute or gauge reference. | A pressure value does not state oxygen concentration or demonstrate a treatment benefit. |
| Oxygen outlet | The generator’s rated flow, outlet concentration and stated measurement conditions. | An outlet percentage is not a measurement of the whole cabin atmosphere or the gas a person actually inhales. |
| Pressurization air | The separate air-flow specification and its matching cabin configuration. | An air-flow figure cannot be presented as oxygen-generator output. |
| Intended use and documentation | The exact product version, stated use and documents applicable to the destination market. | A company management-system certificate does not establish medical-device clearance for every model. |
| Electrical supply | The supplied system’s voltage, frequency and total load, confirmed for the installation site. | A listed 220 V / 50 Hz version does not establish compatibility with a US site. |
For pressure-unit examples and reference conventions, read our ATA, kPa and MPa guide. Its conversion examples do not set the operating limits of a particular chamber.
What should a US buyer request?
Start with the exact chamber and external-unit model numbers. Request their specification sheets, matched equipment list and intended-use documentation. If a seller claims FDA clearance, ask for the clearance reference and verify that it covers the exact device and use; the FDA letter links to the relevant public database.
Ask for the installation drawing, delivery-route requirements and written electrical confirmation for the supplied version. Keep the accepted equipment list with the quotation, including what is supplied, who installs it, and the training and maintenance responsibilities. These records let you compare complete systems rather than isolated headline figures.
Safety information belongs in the model documents
The FDA’s 2025 safety letter emphasizes fire prevention, trained staff, supervision and compliance with each device’s instructions, cleaning and maintenance requirements. Request the applicable instructions and safety documentation before an installation decision. A label such as “mild” is not evidence that fire and pressure hazards can be disregarded.
Common questions
Is “mild hyperbaric” another name for clinical HBOT?
No. The marketing term alone does not establish clinical equivalence. Compare the documented pressure, breathing-gas delivery, intended use and applicable device records.
Does an oxygen-concentrator percentage describe the entire cabin?
No. A generator outlet value and the cabin environment are different measurement locations. Ask which point, conditions and test method each concentration figure refers to.
Where can I compare 3A health equipment?
Use the mild hyperbaric chamber model range for equipment layouts, then the chamber buying guide for configuration questions. Request model-specific evidence for any capability or market requirement you need confirmed.
Sources and scope
FDA: Follow Instructions for Safe Use of Hyperbaric Oxygen Therapy Devices (25 August 2025); UHMS: Definition and Description of Clinical Hyperbaric Oxygen Therapy. These sources explain clinical context and do not endorse 3A health products.
This is an equipment-information guide. It does not provide a treatment protocol or personal suitability assessment. Clinical questions belong with qualified medical professionals; equipment decisions require the exact model’s documentation.
