An FM-200 generator vs aerosol decision comes up whenever a room needs automatic suppression without a cylinder room or a long pipe network. Both are self-contained units mounted inside the protected space, but they are different technologies. The suspended FM-200 generator is a pressurised cylinder of clean agent (HFC-227ea), designed to NFPA 2001 and refilled after discharge. A condensed aerosol generator is unpressurised, releases fine particulate to NFPA 2010, and is replaced after it operates.
AZEIDK supplies both in Saudi Arabia: the FIRESYS FM-200 suspended clean agent generator (XQQC models) and the FirePro condensed aerosol fire suppression system. This article compares them on equal terms, with sizes, an approximate equivalence and guidance on when each fits.
Key takeaways
- The suspended FM-200 generator is a steel cylinder stored at 1.6 MPa, discharging in 8 s or less per the datasheet; the NFPA 2001 limit is 10 s.
- An aerosol generator is unpressurised and works by reaction of a solid compound; it is designed to NFPA 2010 and the manufacturer’s listing.
- Clean agent leaves no residue. Aerosol leaves fine, non-conductive particulate that is cleaned up after discharge.
- FM-200 cylinders are refilled; aerosol generators are replaced after use.
- Both can be used in normally occupied spaces under the conditions of their standard, and final quantities always come from calculation, not approximate tables.
In this article
- What is a suspended FM-200 generator (FM-200 without piping)?
- What is a condensed aerosol generator?
- FM-200 generator vs aerosol: comparison table
- FIRESYS FM-200 generator sizes
- How much aerosol equals an FM-200 generator? (supplier’s approximate table)
- Cost, recharge and maintenance: what changes after a discharge?
- When should you choose an FM-200 generator, and when aerosol?
- The Saudi frame: approved design and Civil Defense requirements
- AZEIDK services for FM-200 generators and aerosol systems
- Frequently asked questions
- Conclusion
What is a suspended FM-200 generator (FM-200 without piping)?
A suspended FM-200 generator is a pre-engineered fixed unit: a storage cylinder of HFC-227ea (known commercially as FM-200) fitted with a solenoid valve, pressure gauge, pressure signal device and discharge nozzle. It hangs from the ceiling or mounts on a wall inside the protected space, so the project needs neither a cylinder room nor the pipe network of a conventional engineered system.
According to the FIRESYS XQQC datasheet, the agent is stored at 1.6 MPa, maximum working pressure is 2.5 MPa, maximum fill density is 1 kg/L, actuation is DC 24 V / 1.6 A and the operating range is 0 to 50 °C. The cylinder is steel with a red epoxy finish. Components include the QRF20/2.5 solenoid valve (3/4 in) with gauge, the QXF0.06/2.5 pressure signal device and the QPT20-X nozzle.
How does it operate?
- Smoke and heat detectors monitor the room in a cross-zoned arrangement, connected to the extinguishing control panel.
- A signal from one detector raises an alarm without discharge.
- When both detectors confirm, the panel triggers evacuation and fan shutdown, then opens the solenoid valve after a 30 s delay.
- The pressure signal device confirms discharge to the panel.
- A manual emergency release and an abort switch are provided.
To be precise: the UL and FM approvals in the supplier’s documents cover the agent, not the generator as a unit. HFC-227ea made by Hangzhou Kec Fire Chemical is UL listed as a clean agent (file EX28542) and FM Approved as “Super 227” (FM24FPUS0065), according to the UL/FM listing printouts supplied with the manufacturer’s datasheet. For general FM-200 system design and safety, see our FM-200 fire suppression system guide.
What is a condensed aerosol generator?
A condensed aerosol generator is an unpressurised canister holding a solid compound. When actuated electrically or thermally, the compound reacts and releases a cloud of very fine particles and gases that interrupt combustion chemically. There is no pressure vessel and no valve; the unit mounts on a wall or ceiling inside the space.
Aerosol systems are designed to NFPA 2010 together with the manufacturer’s listing. FirePro generators are UL listed to UL 2775 for condensed aerosol units (reference EX6960 on FirePro’s certifications page), and the CSIRO ActivFire certificate for the FirePro FP Series states a 15-year operational lifespan. The FirePro agent is acceptable under the U.S. EPA SNAP programme as Powdered Aerosol E with no listed occupancy restriction, for use in line with the NFPA 2010 safety guidelines and with adequate ventilation recommended. For FirePro applications in electrical rooms, see FirePro aerosol for electrical rooms and panels.
One design point: aerosol discharge is hot, so the manufacturer’s listing and installation manual set minimum clearances between each generator and people and combustibles. These listed clearances govern where generators can be mounted.
FM-200 generator vs aerosol: comparison table
| Item | Suspended FM-200 generator | Condensed aerosol generator |
|---|---|---|
| Agent | HFC-227ea clean agent stored as a liquid under pressure | Solid compound releasing fine particulate and gases on actuation |
| Standard | NFPA 2001 | NFPA 2010 plus the manufacturer’s listing (e.g. UL 2775) |
| Occupied spaces | Suitable at design concentrations (typically about 7%); NOAEL 9%, LOAEL 10.5% per EPA | Acceptable under EPA SNAP with no listed occupancy restriction; pre-discharge alarm and evacuation delay per design and listing |
| Residue | None | Fine non-conductive particulate, cleaned after discharge |
| Pressure / vessel | Pressurised steel cylinder (1.6 MPa storage) | Unpressurised canister |
| Discharge time in the standard | 10 s maximum for halocarbon agents (datasheet: 8 s or less) | Per NFPA 2010 and the manufacturer’s listing |
| After discharge | Cylinder refilled | Generator replaced |
| Typical applications | Server and data rooms, telecom rooms, MDB rooms, archives, high-value equipment | Electrical rooms, electrical panels and cabinets, control and telecom rooms |
| Maintenance | Monthly visual and gauge check; full inspection twice a year | Periodic inspection of generators and wiring per manufacturer; replacement at end of service life |
This residue is why aerosol is not classed as a “clean agent” under NFPA 2001. It does not mean aerosol damages equipment, but it explains why many data-hall owners and insurers prefer clean agent for the most sensitive rooms.
FIRESYS FM-200 generator sizes
The XQQC range comes in five capacities. Kilograms equal litres because maximum fill density is 1 kg/L:
| Model | Capacity | Height (mm) | Diameter (mm) | Approx. protected volume (m³) |
|---|---|---|---|---|
| XQQC6/1.6 | 6 kg (6 L) | 345±15 | 250 | 9.11 |
| XQQC10/1.6 | 10 kg (10 L) | 340±15 | 300 | 13.89 |
| XQQC16/1.6 | 16 kg (16 L) | 430±15 | 300 | 22.22 |
| XQQC20/1.6 | 20 kg (20 L) | 415±15 | 350 | 27.78 |
| XQQC30/1.6 | 30 kg (30 L) | 525±15 | 350 | 41.67 |
Protected volumes are approximate figures from the manufacturer’s table. The final number and size of units come from an NFPA 2001 agent calculation based on room volume, lowest expected temperature, altitude and the design concentration for the hazard.
How much aerosol equals an FM-200 generator? (supplier’s approximate table)
FIRESYS provides an approximate comparison between generator capacities and the aerosol mass that would protect a similar space. This table is approximate and is not a design rule; figures vary with the aerosol manufacturer and the listed design density of its product:
| FM-200 generator capacity | Approximate aerosol equivalent (FIRESYS table) |
|---|---|
| 6 L | approx. 1.4 to 2.2 kg |
| 10 L | approx. 2.6 to 3.6 kg |
| 16 L | approx. 3.8 to 4.7 kg |
| 20 L | approx. 5.2 to 6.2 kg |
The table helps with a first comparison, but final design is by calculation: NFPA 2001 for FM-200, and NFPA 2010 with the listed design density of the aerosol manufacturer. The supplier gives no equivalent for the 30 L size.
Cost, recharge and maintenance: what changes after a discharge?
Prices depend on size and quantity, but the cost drivers differ:
- FM-200 generator: after discharge, the cylinder is refilled and returned to service after inspection, so the follow-on cost is agent and refill service. The datasheet calls for a monthly visual check comparing the gauge with fill pressure, and a comprehensive inspection twice a year; nitrogen replaces the agent in simulated discharge tests.
- Aerosol generator: there is no pressure to monitor, and the long service life reduces routine intervention. But the unit is replaced after discharge, and the room must be cleaned of residue.
In both cases, success depends on enclosure tightness. If agent leaks through unsealed openings, concentration drops before the hold time ends. The door fan test is the NFPA 2001 method for verifying this on clean agent systems; see room integrity testing for gas suppression systems.
When should you choose an FM-200 generator, and when aerosol?
An FM-200 generator fits better when:
- The room holds equipment where no post-discharge cleanup is acceptable, such as server, data storage and telecom rooms.
- The owner or insurer requires a clean agent to NFPA 2001.
- You want to return the system to service by refilling rather than replacing.
- The space is normally occupied and you want a well-documented safety margin at design concentration.
Aerosol fits better when:
- The space is an electrical or panel room, an enclosed cabinet, or a control or telecom room, and cleanup after an incident is acceptable.
- You want light, unpressurised units with no periodic pressure checks.
- A long generator service life with less maintenance is a priority.
- The listed clearances from people and combustibles can be met at the mounting positions.
Both are sound solutions when designed and installed to their standard and listing. To compare other special hazard options, see special fire suppression systems.
The Saudi frame: approved design and Civil Defense requirements
In Saudi Arabia, a suppression system is approved as part of the facility’s fire protection drawings under the Saudi Fire Protection Code (SBC 801) and the requirements of the General Directorate of Civil Defense, together with the insurer’s and consultant’s requirements. NFPA 2001 and NFPA 2010 are technical references adopted by the designer, so neither system should be installed from an approximate table, only from an approved design with calculations, datasheets and component submittals.
On the environmental side, Saudi Arabia ratified the Kigali Amendment to the Montreal Protocol on 10 September 2025, in force from 9 December 2025, with an HFC freeze starting in 2028. HFC-227ea is not banned; its ozone depletion potential is zero, its GWP is 3,220 (IPCC AR4, the value given in the EPA SNAP listing) and its atmospheric lifetime is 34.2 years.
AZEIDK services for FM-200 generators and aerosol systems
AZEIDK offers an end-to-end service for both: agent quantity and unit count calculation to the right standard, supply, installation and integration with the extinguishing control panel and fire alarm, room integrity testing by our own technical team, testing, commissioning and handover, and periodic maintenance contracts.
Frequently asked questions
What is an FM-200 generator?
A pre-engineered suspended unit holding HFC-227ea under pressure, mounted inside the protected room and released by the extinguishing control panel, with no cylinder room or pipe network.
What is the difference between FM-200 and aerosol?
FM-200 is a pressurised clean agent that leaves no residue and is refilled (NFPA 2001). Aerosol is an unpressurised generator that leaves fine particulate to be cleaned and is replaced after discharge (NFPA 2010).
Can aerosol be used in server rooms?
Yes, if the system is listed and designed to NFPA 2010 and the manufacturer’s instructions; the FirePro agent is SNAP-acceptable with no listed occupancy restriction. Many owners and insurers still prefer clean agent in data halls because it leaves no residue.
How much aerosol equals a 10 L FM-200 generator?
About 2.6 to 3.6 kg per the FIRESYS approximate table. It varies by manufacturer; final design is by calculation.
Is the FIRESYS generator UL listed?
The listing in the documents covers the HFC-227ea agent (UL EX28542, FM as Super 227), not the generator as a complete unit.
What is the best suppression system for an electrical room?
It depends on room size, equipment sensitivity and whether cleanup is acceptable. Both systems can fit; the approved design, Civil Defense and insurer requirements decide.
Conclusion
Suspended FM-200 generators and aerosol generators solve the same problem, protecting an enclosed room without piping, in different ways. Choose FM-200 when a clean room after discharge and refilling are priorities; choose aerosol when an unpressurised, long-life unit suits you and cleanup is acceptable. Either way, correct calculation, room integrity and approval are what make the system work.
Deciding between FM-200 and aerosol for your room? Send us the room dimensions and the equipment inside, and we will calculate quantities and unit counts for both, with datasheets for each. Talk to the AZEIDK team
