Initially created in response to the rise in use of hypobaric therapy in health care facilities and hypobaric chambers for space and air flight, NFPA 99B, Standard for Hypobaric Facilities, addresses the specific hazards inherent to these oxygen-enriched atmospheres.

The standard offers provisions for facility design, construction, operation, and maintenance to safeguard against fire, explosive, implosive, and electrical dangers. Additional Annexes provide everything from information on the nature of hazards and emergency response procedures to a helpful pressure table you can utilize in your work.

NFPA 99B applies to all hypobaric facilities in which humans will be occupants or are intended to be occupants of the hypobaric chamber.

The 2024 edition has been revised to:

• Replace the terms safety director and chamber supervisor with the term safety coordinator.
• Requirements for electrical equipment with flexible cords have been expanded.
• Automatic operation of safety features has been limited to be required only upon actuation of the chamber deluge suppression system.
• References have been updated.