GX20/FM-200 is a clean agent fire suppression system that protects highvalue assets from fire and the
effects of fire-fighting, allowing normal operations to be resumed quickly with no collateral damage and
clean-up costs. Kidde Fire Protection is at the forefront of new technologies in fire safety, offering a
range of state-of-the-art fire extinguishing systems.
GX-20 systems utilise FM-200, a gaseous extinguishing agent, which has emerged as the most viable
alternative to Halon 1301 on the basis of extensive trials. FM-200 is fast and effective with a low
space/weight characteristic which is also environmentally-acceptable and safe for human exposure.
Halon fire extinguishants were regarded for many years as the most effective fire suppressants for a
wide range of applications. Amendments to the Montreal Protocol of 1987 focused on the manufacture
of Halons, however, and their production has now ceased in recognition of their virulent destruction of
the ozone layer. In addition, European legislation requires that Halon systems within the EU must have
been decommissioned by the end of 2003. FM-200 has been adopted by the majority of the world’s fire
protection companies and is the most widely used clean agent fire suppressant, with tens of thousands
of systems installed across the globe.
What is FM-200?
FM-200 is a colourless, odourless gas containing only carbon, hydrogen and fluorine, thereby lacking the
ozonedepleting presence of bromine atoms. Highly penetrative and achieving an homogeneous
dispersion in the hazard zone, it acts on fires largely by physical means, lowering the temperature of the
flame and fuel to a point at which combustion reactions cannot be sustained. There is no significant
obscuration on discharge and this non-corrosive and electrically non-conductive agent causes no
damage to sensitive equipment with no post-discharge clean-up required.
The GX-20 system comprises a versatile range of cylinders, valves and related components which have
been selected for use with FM-200 and have been subject to stringent testing procedures. Flexibility,
quality and reliability make the Kidde Fire Protection GX-20 range the world’s finest in fire safety and the equipment carries third party listing through FM Global and the Loss Prevention Certification Board, plus Lloyds Register of Shipping and DNV for marine applications. Systems are UL2166 compliant.Both
engineered and pre-engineered systems are available. The pre-engineered systems offer a low
engineering/design cost option with defined maximum design parameters. Engineered systems offer
optimum designs for the defined risks with reduced pipe sizes, unbalanced flows and common room and
void protection possible.
Safety to personnel
A significant body of toxicity data has been obtained for FM-200 from over 70 studies. The US
Environmental Protection Agency and the UK Halon Alternatives Group accepts the use of FM-200 in
occupied spaces up to 9% concentration without mandated egress times and at up to 10.5% with
mandated evacuation times. Since the agent does not act by oxygen depletion in the hazard zone, it
poses no human asphyxiation threat.
A wide range of sizes is available, offering a choice of fill capacities to meet specific requirements and
ensure maximum economy in installation. Each cylinder is manufactured from high strength alloy steel.
The larger cylinders have an optional liquid level device for ease of contents monitoring and improved
GX-20 valves are designed for optimum system performance, allowing the most economical pipe sizes to
be selected, thus lowering installation costs. The fast-opening valves are available in a range of sizes and
are manufactured from tough, corrosion-resistant brass under stringent quality control standards. The
valve design enables the Kidde worldwide network of factory-trained distributors to recharge the
cylinders without the need for replacement parts. An easy-to-read gauge on the valve permits the
convenient visual inspection of the cylinder pressure.
GX-20 valves are actuated by one of the following means:
• Electric solenoid
• Pneumatic diaphragm
• Local manual release at the control head
• Manual release at a remote pull station
All related components from discharge nozzles to control heads are designed to be compatible, allowing
a complete system to be configured using FM Global and LPCB approved Kidde Fire Protection
A range of custom-designed nozzles is available, including 180° wall-mounted and 360° ceiling-mounted
System space requirements
System space and weight are usually at a premium in industrial and commercial premises. FM-200 is
stored as a liquid in nitrogen-pressurised containers at 25 bar, leading to minimal storage requirements
comparing favourably with all other viable gaseous agents.
Kidde FM-200 systems are FM Global listed, meet the criteria of UL2166 and carry LPCB design manual
and component approval.
Kidde Fire Protection systems are designed to conform to NFPA 2001 and ISO 14520 requirements. An
empirically-verified Windows™ based computer program is used to model two-phase agent flow and
ensure that the correct concentration of agent is achieved within 10 seconds throughout the protected
zones as required by the NFPA and ISO Standards.
GX-20 systems are ideally suited to the protection of high value assets from both loss by fire damage
and the accompanying catastrophic plant down-time.