NFPA 75: Standard for the Fire Protection of Information Technology Equipment

NFPA 75 — "Standard for the Fire Protection of Information Technology Equipment" — sets fire protection requirements for facilities and parts of facilities that contain information technology (IT) equipment. It applies to traditional computer rooms, data halls in hyperscale and colocation facilities, enterprise data centers, and any other space whose primary function is processing, storing, or transmitting data.

The standard is risk-analysis driven: construction requirements, detection systems, and suppression systems are all scaled to the fire risk of the specific installation. NFPA 75 works alongside IBC, NFPA 101 (Life Safety Code), and NFPA 70 (National Electrical Code). Where more than one applies to the same space, the most restrictive provision governs.

NFPA 75 applies whenever a facility contains IT equipment of sufficient value, operational importance, or fire load to warrant enhanced fire protection. That includes:

• Hyperscale and cloud-provider data center campuses.
• Multi-tenant colocation facilities and carrier hotels.
• Enterprise data centers and on-premises computer rooms.
• Trading floors, control rooms, and network operations centers with concentrated IT equipment.
• Records storage, tape libraries, and archival rooms that interconnect with IT equipment areas.

The standard also addresses ancillary spaces — battery rooms, UPS rooms, mechanical and electrical service rooms, tape storage, and office areas — that share construction or systems with IT equipment rooms.

NFPA 75 is risk driven. It calls for a documented fire risk assessment of the IT equipment area, and that assessment is the basis for the level of protection applied: room construction, detection, suppression, and ongoing maintenance. The 2024 edition frames this under Chapter 4, Fire Protection Approaches, which allows either a prescriptive path or a performance-based design. Factors typically weighed:

• Business impact of equipment loss or downtime.
• Value of data and equipment at the site.
• Fire load from construction materials, furnishings, and packaging.
• Surrounding occupancy and adjacent risks.
• Redundancy available through off-site backup or failover sites.
• Continuity of operations commitments to customers or regulators.

These considerations drive downstream decisions: whether the IT equipment room needs more than its minimum one-hour separation, whether gaseous suppression is warranted, and how aggressive the detection threshold should be. That includes the strictness applied to firestop details on every penetration through the rated envelope.

NFPA 75 requires IT equipment rooms to be separated from other occupancies by fire-resistance-rated construction. The 2024 edition sets a minimum of one-hour-rated construction, with three-quarter-hour-rated opening protectives (doors) called for in that barrier. Higher ratings apply where the adjacent occupancy or other provisions require them, including two-hour separations for battery systems and IBC occupancy separations. Walls, floors, and ceilings forming the enclosure have to maintain their rating continuously, which is where firestop enters the picture.

The standard also addresses:

• Separation between IT equipment rooms and battery or UPS rooms.
• Separation between IT equipment rooms and records storage.
• Separation between IT equipment rooms and mechanical or electrical support spaces.
• Raised floor construction and combustibility limits on materials below the raised floor.
• Ceiling and suspended ceiling assemblies.

NFPA 75 limits how much fuel is allowed inside the IT equipment area. It restricts the materials and equipment permitted in the space using the combustible, limited-combustible, and noncombustible material classes, controlling what can be brought in and in what quantity, and it reaches the materials below a raised floor as well as the combustible packaging and records kept in the room.

Abandoned cable is a specific target. Cable no longer identified for future use has to be removed rather than left to accumulate, because unused bundles add fuel and smoke load with no operational benefit and complicate the firestop fill at every penetration they pass through.

For data center cabling, more than one code applies. NFPA 75 caps the combustible material load in the room and requires a listed firestop system wherever cabling penetrates a rated wall or floor. The National Electrical Code adds the cable's own fire rating (plenum-rated versus riser-rated) and the wiring methods for IT rooms (Article 645), along with its own sealing rules for electrical and communications penetrations (Articles 300, 770, 800, and 820). For the penetration-sealing side, see the firestop requirements below and our firestop product selection guide.

Any penetration through a fire-resistance-rated assembly bounding an IT equipment room has to be sealed with a through-penetration firestop system tested to ASTM E814 / UL 1479 or an equivalent method. NFPA 75 reinforces the IBC baseline and adds IT-specific considerations:

For operational workflow — how to survey, document, and remediate firestop across an active data center — see the NFPA 75 firestop compliance guide for data centers.

NFPA 75 addresses detection, suppression, and special extinguishing systems for IT equipment areas. Common elements:

• Very Early Warning Fire Detection (VEWFD) systems, typically air-sampling smoke detection.
• Clean-agent gaseous suppression (NFPA 2001) for rooms where water discharge would damage critical equipment.
• Pre-action sprinkler systems as an alternative or supplement to gaseous suppression.
• Portable fire extinguishers appropriate to the hazards present.
• Emergency power-off (EPO) and ventilation controls.

For clean-agent gaseous suppression specifics, see NFPA 2001.

Portable extinguishers in IT equipment rooms should be clean-agent (Halotron) or CO2, not dry chemical. ABC dry-chemical extinguishers are Class C rated and will put out an electrical fire, but the monoammonium phosphate residue is corrosive to electronics and can destroy servers, switches, and storage arrays that survived the original fire. For IT equipment rooms, the right agent is clean-agent or CO2 rather than dry chemical, precisely to avoid this secondary damage. Halotron is listed under ANSI/UL 711 and typically rated 2-A:10-B:C — covering paper, flammable liquids, and energized electrical from one cylinder. CO2 is listed under ANSI/UL 154, rated 10-B:C (no Class A), and is the cheaper per-pound option for purely electrical rooms. Other clean agents (HFC-236fa / FE-36, Halotron BrX) are functionally equivalent but specified less often; for those, see our Fire Extinguisher Selection Guide for Server Rooms and Data Centers.

NFPA 75 specifies which detection and suppression systems are required, but their installation, acceptance testing, and periodic inspection, testing, and maintenance follow the referenced installation standards: NFPA 72 for detection and alarm, NFPA 25 for water-based systems, NFPA 2001 for clean agent, and NFPA 10 for portable extinguishers. There is no standalone NFPA 75 maintenance schedule; the recurring compliance calendar is set by those component standards, and on the passive side by firestop re-inspection after every cable change.

Chapter 11 of the 2024 edition covers the utilities serving the IT equipment area: HVAC, power, and disconnecting means. Where air ducts or air-transfer openings pass through the fire-rated separation barrier, NFPA 75 requires automatic fire and smoke dampers so the barrier keeps its rating even where air has to move through it.

NFPA 75 addresses disconnecting means for the IT equipment area, and it requires power to the protected equipment to be disconnected when a total-flooding gaseous suppression system discharges, unless the risk considerations call for continuous power. The familiar room-level EPO button, though, is primarily an NEC Article 645.10 provision, and it is conditional: it applies only when the designer elects the Article 645 alternative wiring allowances, such as power whips under a raised floor. Build to standard NEC wiring methods and the Article 645 EPO need not apply.

NFPA 75 does not end at prevention. Chapter 12, Emergency and Recovery Procedures, addresses planning for an incident and restoring operations afterward. Annex B, "What to Do in the First 24 Hours for Damaged Electronic Equipment and Magnetic Media," gives practical guidance on salvaging equipment and media exposed to smoke, corrosion, and water, and Annex C covers business-interruption and risk considerations.

This is the part of the standard that makes the portable-extinguisher choice matter beyond the fire itself. A dry-chemical discharge leaves corrosive residue across energized boards, the exact recovery burden the standard's first-24-hours guidance is written to reduce, and the reason the standard of care for IT rooms is a clean-agent or CO2 extinguisher.

The current edition is NFPA 75-2024, approved as an American National Standard in December 2023. Earlier editions were published in 2020, 2017, 2013, 2009, and 2003.

What changed in the 2024 edition:

• Stationary lithium-ion energy storage requirements moved out of NFPA 75 to NFPA 855, which governs energy storage system installation. NFPA 75 kept its lithium-ion UPS provisions, including the new off-gas detection below.
• New off-gas detection requirements for lithium-ion UPS, aimed at catching electrolyte vapor before thermal runaway (conventional flammable-gas sensors do not substitute).
• New requirements for immersion-cooling equipment (Chapter 8).
• A new Annex F, "Performance Test Procedures for Early Fire Detection Systems," drawn from optional tests in NFPA 76.

Most jurisdictions adopt NFPA 75 by reference in their local fire code, and the adopted edition usually lags the current one by a cycle or two. Check with the AHJ to confirm which edition governs a specific project. When a hyperscale operator or large insurer imposes its own internal fire-protection standard, that internal standard often references the current edition regardless of local adoption lag.