NFPA 99, Next Edition
 MGPHO Webmaster
MGPHO Webmaster
November 17, 2025 at 5:40 pm

NFPA 99, Proposal to limit Oxygen on Upper floors

Disclaimer: Do not kill the asking Engineer for being curious.

I have heard rumors that there is a proposal out there for NFPA to limit the amount of Oxidizing gases to 20,000 cu ft. above 5th floor of a hospital. I’m curious why this is a thing when we have precautions in place such as ZVB’s, fire sprinklers, etc. Also, what’s the magic in that number?

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  • Robert Kroening

    January 27, 2026 at 11:45 am

    This is already in the 2024 version of NFPA 99.

    This requirement is for storage of oxidizing gases and does not affect the number of outlets on a floor. This new requirement brings NFPA 99 in line with other codes, like NFPA 55.

    5.1.3.3.2.5*

    The total quantity of medical gases connected to or in storage for central supply systems shall comply with Table 5.1.3.3.2.5 for each enclosure or room.

  • Carsten Lunde

    February 17, 2026 at 9:17 pm

    This is new to me but, I have been in several discussions about NFPA 99 definition vs. UFC definition of storage for Maximum Allowed Quantities MAQ of oxidizers. UFC does not recognize the “in process” definition of an E cylinder or D cylinder is a portable cylinder cart or cylinder holder affixed to a gurney, bed or wheel chair. The UFC states all cylinder volumes apply to the MAQ. This also includes manifold rooms on upper floors where the NFPA 99 fire containment for nonflammable medical gas connected to manifolds or in storage.

    Any thoughts out there about the fundamental difference of the Fire Code vs. NFPA 99 Healthcare Facilities Code in regard to oxygen, nitrous oxide and medical air cylinders in use (anesthesia machines).

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