There is no single best clean agent. FM-200 (HFC-227ea) and FK-5-1-12 (formerly sold as 3M Novec 1230) suit occupied rooms where cylinder space is tight, inert gases suit owners who want zero global warming impact and have room for more cylinders, and carbon dioxide (CO2) belongs in normally unoccupied hazards because it is lethal at extinguishing concentrations. This clean agent comparison explains how each works and how to choose on a Saudi project.
Key takeaways
- NFPA 2001 covers halocarbons (HFC-227ea, FK-5-1-12) and inert gases (IG-541, IG-55 and others); CO2 systems follow NFPA 12, and aerosols NFPA 2010.
- Fike’s published design concentration ranges for normally occupied spaces: 6.25 to 10.5% for HFC-227ea and 4.5 to 10% for FK-5-1-12, with 5 minutes maximum exposure; other manufacturers publish their own. CO2 above 17% can kill within a minute.
- Global warming potential (GWP), per the US Environmental Protection Agency (EPA): 3,220 for HFC-227ea, under 1 for FK-5-1-12 and zero for inert gases.
- 3M completed its exit from manufacturing per- and polyfluoroalkyl substances (PFAS) at the end of 2025. FK-5-1-12 is still supplied by others; confirm that any refill agent is accepted under your system’s listing.
- Whatever the agent, the room decides the result: sealing, relief vents and a door fan test are part of the design.
In this article
What counts as a clean agent, and where CO2 fits
A clean agent is an electrically nonconducting extinguishant that leaves no residue when it evaporates, so it suits server rooms, control rooms and archives, where water or powder could do more harm than a small fire. NFPA 2001, the Standard on Clean Agent Fire Extinguishing Systems, covers two families: halocarbon agents and inert gases.
CO2 also leaves no residue, but CO2 systems follow a separate standard, NFPA 12, because extinguishing concentrations are lethal. Condensed aerosols, such as FirePro systems, follow NFPA 2010, and water mist is another alternative for some hazards. Our NFPA 2001 standard guide explains what the standard requires.
How each agent works, side by side
HFC-227ea, sold under names including FM-200, is a colorless, odorless liquefied compressed gas. FK-5-1-12 is a clear liquid at room temperature that boils at 49°C and discharges as a nonconducting gas. Both are halocarbons, which extinguish mainly by absorbing heat, at about 4 to 12% by volume.
Inert gases, nitrogen, argon or blends of them, extinguish by lowering oxygen. IG-541 is about 52% nitrogen, 40% argon and 8% CO2, and the EPA advises that its design concentration should give no more than 5% CO2. Inert gases cannot be liquefied, so they are stored as high-pressure gas and need far higher concentrations than halocarbons; one review (Robin, 2012) cites extinguishing concentrations of roughly 40 to 70% by volume, and the listed design manual sets the actual value. CO2 also lowers oxygen, at a minimum total flooding design concentration of 34%.
| Criterion | HFC-227ea (FM-200) | FK-5-1-12 | Inert gases (IG-541, IG-55, IG-100, IG-01) | Carbon dioxide |
|---|---|---|---|---|
| Standard | NFPA 2001 | NFPA 2001 | NFPA 2001 | NFPA 12 |
| How it extinguishes | Mainly absorbs heat | Mainly absorbs heat | Lowers oxygen | Lowers oxygen |
| Storage | Liquefied gas | Liquid | High-pressure gas | Pressurized, to NFPA 12 |
| Normally occupied spaces | 6.25 to 10.5%, 5 minutes maximum (Fike) | 4.5 to 10%, 5 minutes maximum (Fike) | Up to 43% (12% oxygen) for 5 minutes, or 52% (10% oxygen) for 3 minutes (CSE, 2018) | No: above 17% can kill within a minute |
| Cylinder space | Compact | Compact | Largest | Large, at 34% or more |
| GWP (EPA) | 3,220 | Under 1 | 0 | 1 |
| Supply and policy | A hydrofluorocarbon (HFC) under the Kigali Amendment | 3M exited at the end of 2025; other makers supply it | No HFC or PFAS constraints | Safety rules dominate |
Confirm figures against your system’s datasheet and the adopted NFPA 2001 edition.
Which agent suits which room?
This is a starting shortlist, not a design rule; the risk assessment, the consultant and Civil Defense make the final call.
| Room or hazard | Usual shortlist | What decides it |
|---|---|---|
| Server room or data center that staff enter | Halocarbon or inert gas | Cylinder space, noise near hard drives, pressure tolerance and owner policy |
| Small telecom or control room with no spare space | Halocarbon | Fewest cylinders |
| Archives, record rooms and museum stores | Halocarbon or inert gas | No residue on documents; inert gas if the owner wants zero GWP and space allows |
| Electrical rooms and switchgear | Clean agent, aerosol or water mist | Hazard size, occupancy and the consultant’s risk assessment |
| Normally unoccupied industrial spaces | Inert gas or CO2 | CO2 only with NFPA 12 safeguards: time delay, supervised lock-out, alarms and signs |
Space, room pressure and discharge noise
Concentration drives size. Halocarbons need a compact cylinder bank; inert gases need many more high-pressure cylinders, a larger storage room and a floor loading check.
Every discharge briefly changes room pressure, which light partitions, ceilings and glazing may not withstand; inert gas systems in particular have been challenged by over-pressurization. Size relief vents from the agent, discharge rate and the room’s leakage and strength, for example with the Fire Suppression Systems Association (FSSA) PRG-03 guide.
In data centers, Siemens notes that conventional gas extinguishing nozzles often exceed 130 dB and that hard disk drives are sensitive to the sound pressure of inert gas discharges, so ask how the design limits it.
Environmental status and agent supply
HFC-227ea (FM-200)
HFC-227ea is listed in Annex F of the Kigali Amendment to the Montreal Protocol, which limits HFC production and consumption in steps; Saudi Arabia deposited its acceptance on 10 September 2025. Since 1 January 2025, Regulation (EU) 2024/573 has barred new fire protection equipment that contains or relies on HFCs from the EU market unless required to meet safety requirements, while the EPA still lists HFC-227ea as acceptable. On Saudi projects, confirm current national requirements with the consultant and Civil Defense, ask the consultant to also check environmental import clearance with the National Center for Environmental Compliance (NCEC), and plan lifetime refills; our FM-200 system guide has more detail.
FK-5-1-12
3M’s 2025 annual report confirms that its PFAS manufacturing exit is complete, and Fike notes that 3M discontinued Novec 1230. Other manufacturers offer this fluoroketone under their own names, such as Fike’s SF1230, which Fike describes as UL listed and FM approved. Confirm any refill agent is listed for your system, as our FK-5-1-12 (Novec) system guide explains.
Inert gases and Saudi conformity
Inert gases have zero GWP and sit outside HFC and PFAS controls, which suits owners with strict environmental policies.
The Saudi Standards, Metrology and Quality Organization (SASO) Technical Regulation for Fire Control Materials and Equipment covers firefighting substances, lists ISO 14520 parts for agents including FK-5-1-12 and the IG inert gases, and requires a certificate of conformity from a notified body through the SABER platform; complete firefighting systems are outside its scope. Design follows the Saudi Fire Protection Code (SBC 801), mandatory in its 2024 edition since 30 June 2025, and Civil Defense requirements. Good practice is to specify agent, cylinders, valves, nozzles and software as one listed system.
Step-by-step: choosing a clean agent system
- Define the hazard and whether the room is normally occupied.
- Survey the room: volume, voids, openings, air conditioning ducts and walls.
- Check space and floor loading for the cylinder room, especially for inert gas.
- Shortlist agents on occupied-space limits, pressure tolerance and noise sensitivity.
- Check lifetime refill availability and any owner or insurer policy on HFCs and PFAS.
- Ask bidders for the listed calculation, cylinder count, vent sizing and door fan test plan.
- Compare whole-life cost, including sealing, vents, refills and maintenance.
- Agree the releasing panel, detection, interlocks and approvals route with the consultant and Civil Defense.
Common mistakes and what drives cost
Common mistakes
- Choosing on agent price and leaving out the cylinder room, vents and sealing.
- Specifying CO2 for a room that people enter.
- Refilling an old Novec 1230 system with any FK-5-1-12 not accepted under its listing.
- Copying the design concentration or agent quantity from another project.
What drives cost
- Net volume, design concentration and the agent, which set agent quantity, cylinder count, storage space and refill cost.
- Pipe length, nozzles and selector valves for shared cylinder banks.
- Room sealing and relief vents, often missing from early quotations.
- The releasing panel, detection and interlocks, plus lifetime refills and maintenance.
How AZEIDK helps
Through our special fire suppression solutions, AZEIDK studies the hazard on site, provides technical selection of systems and equipment, and supplies, installs, tests and commissions gas suppression systems, integrated with the fire alarm system where required, with maintenance support. Our team brings more than 16 years in the Saudi market and over 10,000 projects and facilities supported.
Brands AZEIDK supplies include American Fire Control (AFC), whose range with us includes an FM-200 gas suppression system for server rooms and critical facilities; Context Plus, including the EP203/CON automatic gas extinguishing control panel; and FirePro condensed aerosol systems. See also our news on clean agent suppression for critical facilities.
FAQ
Which is better, FM-200 or FK-5-1-12?
Neither wins everywhere. Both are NFPA 2001 halocarbons, both need few cylinders, and both can protect normally occupied rooms within their exposure limits. FK-5-1-12 has a far lower GWP, while HFC-227ea is controlled under the Kigali Amendment. The room, the owner’s environmental policy, the listed system and long-term refill supply decide.
Is FM-200 banned?
Not everywhere. The US EPA still lists HFC-227ea as acceptable for total flooding, while since 1 January 2025 the EU has prohibited placing on the market fire protection equipment that contains or relies on HFCs, except when required to meet safety requirements. Saudi Arabia has accepted the Kigali Amendment, so check the current national position with your consultant and Civil Defense, and have the consultant also check environmental import clearance with the NCEC.
Can an existing Novec 1230 system still be refilled?
In many cases, yes, but not with just any agent. 3M has exited PFAS manufacturing, and other manufacturers now supply FK-5-1-12. Confirm that the refill agent is accepted under your system’s listing, and it is good practice to use a filler the system manufacturer authorizes. Agree the refill route with your maintenance contractor in advance.
Is it safe to stay in the room during a clean agent discharge?
No one should stay. Halocarbon and inert gas systems can protect normally occupied rooms within the exposure limits, but occupants should leave on the pre-discharge alarm. NFPA 2001 (2025 edition), as amended by tentative interim amendment (TIA) 25-1, requires an egress time study to verify that the maximum exposure time limits are achieved. Re-enter only after the room is ventilated.
Can CO2 be used to protect a server room?
Not if people enter it. CO2 total flooding uses design concentrations of 34% and more, while exposure above 17% can cause unconsciousness and death within a minute, and the EPA found that most reported incidents occurred during maintenance on or around the CO2 system. For staffed server rooms, a halocarbon or inert gas system to NFPA 2001 is the recommended route.
Choosing a clean agent for a sensitive room? Send us the room drawings and a short description of what it protects, and we will compare the options on your actual enclosure. Contact the AZEIDK team
