In a server room, electrical room or archive, putting out a fire with water can destroy what you are trying to protect: equipment worth millions, irreplaceable data, or historic documents. This is where clean agent fire suppression systems are used, the best known being FM-200, which put out a fire in seconds without wetting or residue. But their success depends on precise design: a calculated quantity of agent, a sealed room, and correct integration with the alarm and air conditioning. This guide explains what FM-200 is, where it is used, its components, design requirements, people's safety and maintenance.
What Is FM-200?
A trade name for a clean extinguishing agent (HFC-227ea) stored as a liquid under pressure and released as a gas into the protected room, putting out the fire without leaving residue or damaging equipment, and without needing clean-up after discharge.
Where Is It Used?
- Server rooms and data centres.
- Electrical panel and control rooms.
- Telecommunications rooms.
- Archives, important documents and museums.
- Factory control rooms. Read: Requirements for factories.
Comparison With Water Suppression
| Item | Clean agent (FM-200) | Water sprinklers |
|---|---|---|
| Effect on equipment | Does not damage it or leave residue | May damage equipment and documents |
| Protection scope | A specific sealed room | Large areas |
| Room requirements | Sealing and leakage testing | No sealing required |
| Common use | Servers, electrical and archives | Most building spaces |
System Components
- Agent cylinders and their valves.
- A pipe network and discharge nozzles.
- Detectors (often with double-knock confirmation to avoid false discharge).
- A release control panel, with abort and manual release switches.
- Audible and visual alarms and a time delay before discharge so people can evacuate.
Design Requirements
- Calculating the agent quantity according to room volume and the required design concentration.
- Room integrity: the room must retain the agent long enough, so openings are sealed and integrity is tested.
- Pressure relief vents where needed.
- Integration with the alarm system and shutting down air conditioning on discharge. Read: Conventional or addressable alarm?.
- Cylinder location close by, protected and easy to access for maintenance.
The design is subject to the Saudi Fire Code (SBC 801) and recognised reference standards for clean agent systems. Read: The fire protection code.
Operating Sequence in a Fire
- A first detector sends a pre-alarm.
- A second detector confirms the fire and evacuation alarms start.
- Air conditioning shuts down and dampers close.
- A countdown allows people to leave or the discharge to be aborted manually.
- The agent is released and the required concentration is reached.
Safety for People
The system is designed for occupied spaces within set concentrations, but procedures remain strict: evacuate on alarm, do not enter after discharge before ventilation, and train staff. Read: The evacuation plan.
Maintenance
Checking cylinder pressure and weight, testing detectors and the control panel, and testing room integrity after any change to it, such as passing new cables through walls.
Frequently Asked Questions
Is FM-200 dangerous to people?
It is designed within concentrations intended for occupied spaces, with evacuation procedures and a delay before discharge.
Does it replace sprinklers?
It protects the room it is designed for; the building's other requirements are set by the code.
What happens if the room door is left open?
The agent leaks and the required concentration is not reached, so suppression is weakened.
Are there alternatives to FM-200?
Yes, there are other clean agents and inert gas systems; the designer chooses the most suitable for the room and standards.
Does the system need an approved drawing?
Yes, as part of the fire system drawings. Read: Fire system drawings.
How Abak Engineering Consultancy Helps
Abak is an accredited engineering office in Riyadh that designs clean agent suppression systems for server, electrical and archive rooms, with precise quantity calculations, integration with alarm and air conditioning, and approved drawings. See our alarm and fire-fighting systems design service, or contact us.
Regulatory information is based on the Balady platform and the Ministry of Municipalities and Housing, and procedures may be updated by the competent authority. Last reviewed: October 2026.