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Codes and standards published by NFPA are displayed as read-only under license from NFPA solely for use within this system. NFPA material may not be downloaded, printed, reproduced, or transferred.

Hazards in hypobaric facilities pose major fire safety concerns. Mitigate the risks with the 2015 NFPA 99B.

The presence of oxygen-enriched atmospheres pose specialized risks, and NFPA 99B: Standard for Hypobaric Facilities presents important requirements intended to protect against fire, electrical, explosive, and implosive hazards. The Standard also provides criteria for facility design, construction, operation, and maintenance.

Use the latest best practice for architects, designers, facility staff, maintenance professionals, and safety directors.

Reference the 2015 NFPA 99B for the latest preferred definitions, and updated references to the 2015 NFPA 99: Health Care Facilities Code. NFPA 99B's Chapter 5, Administration and Maintenance, provides requirements for the precautions and procedures to safely continue operation throughout the ongoing use of a hypobaric chamber or facility.

The Standard's Annexes provide detailed information about hazards and the fire response procedure, and also includes a useful pressure table. It's essential for manufacturers and anyone who owns or operates hypobaric facilities.

Document History

  1. NFPA (Fire) 99B

    Standard for Hypobaric Facilities, 2024 Edition

    • Most Recent
  2. NFPA (Fire) 99B

    Standard for Hypobaric Facilities, 2021 Edition

    • Historical Version
  3. NFPA (Fire) 99B

    Standard for Hypobaric Facilities, 2018 Edition

    • Historical Version
  4. NFPA (Fire) 99B


    Standard for Hypobaric Facilities, 2015 Edition

    • Historical Version
  5. NFPA (Fire) 99B

    Standard for Hypobaric Facilities, 2010 Edition

    • Historical Version
  6. NFPA (Fire) 99B

    Hypobaric Facilities, 2005 Edition

    • Historical Version
  7. NFPA (Fire) 99B

    Hypobaric Facilities, 2002 Edition

    • Historical Version
  8. NFPA (Fire) 99B

    Hypobaric Facilities

    • Historical Version