FM-200 (HFC-227ea) Clean Agent Suppression System

What Is It?

FM-200 is the trade name for a clean suppression agent based on HFC-227ea (heptafluoropropane) — colorless, odorless, and electrically non-conductive. Used as a total flooding agent against Class A, B, and C fires, it extinguishes mainly by absorbing heat as it vaporizes, with an additional chemical effect on the chain reaction in the flame zone. The system is engineered around pressurized FM-200 cylinders, pipe network, nozzles, a control panel, and detection units, all sized specifically for the protected volume through engineering calculation.

FM-200’s defining characteristic is that its design concentration can be calculated below the human-safety threshold (NOAEL: 9% by volume), which has made it a long-established choice for data centers, offices, museums, and other spaces with continuous or intermittent human presence. This does not mean the space need not be cleared during discharge; an alarm and evacuation procedure is applied on every project. Systems are designed to international gaseous suppression standards such as TS EN 15004, ISO 14520, and NFPA 2001, with components independently tested and certified by bodies such as UL, FM, and LPCB.

How It Works

When the control panel evaluates a confirmed signal from the detection units, it triggers the discharge valve for the affected zone, releasing liquid FM-200, pressurized with nitrogen in the cylinder (typically 25 or 42 bar, depending on the system), through the pipe network to the nozzles. The agent vaporizes as it leaves the nozzles and fills the space in under 10 seconds, reaching the design concentration needed to stop the fire from continuing. The operating temperature range is taken from the approval documents of the system used.

FM-200’s effectiveness depends on holding the calculated design concentration for a sufficient hold time after discharge. For that reason, the sealing level of the protected space is verified through door-fan (room integrity) testing; inadequate sealing can let the concentration drop prematurely and create a risk of re-ignition.

Where It’s Used

FM-200 is widely used in occupied spaces and spaces housing sensitive electronic equipment: data centers and server rooms, museum and archive storage, technical rooms in office buildings, electrical/telecom rooms in hospitals and hotels, and critical infrastructure areas in shopping and mixed-use centers are the primary applications.

The fact that the agent leaves no residue and does not damage electronics is precisely why it’s chosen for spaces housing systems that must keep running without interruption.

Safety

In the U.S. Environmental Protection Agency’s SNAP review, HFC-227ea is given a no observed adverse effect level (NOAEL) of 9% by volume and a lowest observed adverse effect level (LOAEL) of 10.5%. In occupied spaces the design concentration is calculated to stay below these limits. The system is nevertheless built around people leaving before discharge: the control panel first sounds an audible and visual alarm, personnel evacuate during the defined delay, and unnecessary exposure is avoided. Because the agent can form decomposition products when exposed to high temperatures in a fire, the space should not be re-entered after discharge until it has been ventilated and an authorized person has cleared it.

As an HFC compound, FM-200 carries a higher global warming potential than newer-generation agents such as FK-5-1-12; on projects where environmental criteria are a priority, this should be weighed when selecting the agent.

Safe, effective operation depends on correct pipe network design, regular pressure monitoring, and periodic room integrity testing. Commissioning and a planned maintenance schedule after installation should therefore be treated as an integral part of project scope, not an afterthought, for the system’s long-term reliability.

Regulatory Status

In Türkiye, fire protection equipment containing fluorinated greenhouse gases falls under the Regulation on Fluorinated Greenhouse Gases published in Official Gazette No. 32693 of 15 October 2024. The regulation’s list of placing-on-the-market restrictions (Annex 3) prohibits fire protection equipment containing perfluorocarbons or trifluoromethane (HFC-23); HFC-227ea is not on that list. Companies installing or servicing these systems for third parties must, however, hold a TSE Service Competence Certificate under TS 13905, the technicians must hold a Professional Competence Certificate, and fixed fire protection equipment containing 5 tonnes CO2 equivalent or more must be registered in the EKOMVET database by its operator.

The European Union applies its own, stricter F-gas legislation. For projects in EU countries, whether a new HFC-based fire protection system can be installed must be assessed separately under current EU rules. HFC-227ea is also, together with FK-5-1-12, within the scope of the EU universal PFAS restriction proposal that is still under assessment; we summarize it on our FK-5-1-12 page.

This system is one of the gas fire suppression systems GYS designs and installs. Comparisons with other agents, applications and the project process are on our home page.