What is GWP and why does it matter for fire protection?

ExxFire · 19 Jun 2026

Global Warming Potential, or GWP, is a measure of how much heat a greenhouse gas traps in the atmosphere over a set period, typically 100 years, relative to carbon dioxide. In fire protection, GWP matters because many traditional fire suppression agents are potent greenhouse gases. Businesses choosing fire extinguishing agents today face increasing regulatory pressure, environmental accountability, and the practical risk of being locked into technologies that are being phased out. The sections below answer the most important questions about GWP and fire safety.

How is GWP measured and what do the numbers mean?

GWP is measured by comparing how much heat one kilogram of a gas traps in the atmosphere over 100 years relative to one kilogram of carbon dioxide, which has a GWP of 1. The higher the number, the greater the warming impact the gas has. A substance with a GWP of 1,000 traps 1,000 times more heat than the same mass of CO2 over that period.

The 100-year timeframe is the standard reference used by the Intergovernmental Panel on Climate Change and adopted in most environmental regulations. Some assessments also use 20-year GWP values, which tend to be even higher for short-lived gases, but the 100-year figure is the benchmark most commonly cited in fire safety compliance and environmental reporting.

When evaluating fire suppression agents, GWP values give you a direct, comparable signal of environmental impact. A GWP below 150 is generally considered low. A GWP above 1,000 is considered high and is the threshold at which many regulatory frameworks begin imposing restrictions.

What GWP values do common fire suppression agents have?

Fire suppression agents vary dramatically in their global warming potential. Hydrofluorocarbons (HFCs) like HFC-227ea, widely used in gaseous suppression systems, carry a GWP of around 3,220. FK-5-1-12 (Novec 1230) has a lower but still significant GWP of approximately 1. Halon, now banned in most countries, had a GWP in the thousands, along with severe ozone-depleting properties.

Here is a comparison of common fire extinguishing agents by approximate GWP:

Halon 1301: GWP of approximately 7,140 (phased out under the Montreal Protocol)
HFC-227ea (FM-200): GWP of approximately 3,220
HFC-125: GWP of approximately 3,500
FK-5-1-12 (Novec 1230): GWP of approximately 1 (but subject to PFAS regulation)
CO2: GWP of 1, but poses asphyxiation risks in occupied spaces
Inert gases (nitrogen, argon, IG-541): GWP of 0, naturally occurring and non-toxic

It is worth noting that FK-5-1-12, despite its low GWP, is classified as a per- and polyfluoroalkyl substance (PFAS). This places it under a separate but equally significant regulatory challenge, since PFAS chemicals are being restricted across the European Union and other jurisdictions due to their persistence in the environment, regardless of their warming potential.

Why are high-GWP fire agents being phased out?

High-GWP fire suppression agents are being phased out because they contribute significantly to climate change and, in many cases, also fall under PFAS restrictions due to their chemical composition. Regulatory frameworks across Europe, North America, and Asia are progressively banning or limiting the use of fluorinated gases in new installations and, increasingly, in existing systems.

In the European Union, the F-Gas Regulation has already banned the use of HFCs with a GWP above 2,500 in most new applications, with further restrictions scheduled through 2030. This directly affects widely used agents like HFC-227ea. At the same time, the proposed EU PFAS restriction under REACH targets fluorinated compounds more broadly, which puts agents like FK-5-1-12 in the regulatory crosshairs even though its direct GWP is low.

The practical consequence for businesses is significant. Organizations that have installed high-GWP suppression systems may face rising costs for refills as regulated gases become scarcer, mandatory upgrades before end-of-life, and potential non-compliance penalties. Planning a transition now, rather than waiting for a regulatory deadline, reduces both cost and operational risk.

What are the low-GWP alternatives to traditional fire suppression systems?

The most effective low-GWP alternatives to traditional fire suppression systems are inert gases, particularly nitrogen and argon-based blends, and water mist systems. These agents have a GWP of zero or near zero, contain no fluorinated chemistry, and leave no chemical residue after discharge.

Inert gas suppression works by reducing the oxygen concentration in a protected space to a level where combustion cannot be sustained, without dropping it so low as to be immediately dangerous to people. Nitrogen, in particular, is abundant, naturally occurring, and entirely PFAS-free, making it the most straightforward path to environmentally friendly fire suppression.

Water mist systems are another option, especially in environments where water damage is tolerable. However, they are not suitable for all applications, particularly where sensitive electronics or electrical equipment are involved, since water and energized components do not mix safely.

For enclosed, equipment-focused environments such as server racks, switchgear cabinets, and battery energy storage systems, nitrogen-based suppression offers a particularly strong fit. It extinguishes fire at the source without damaging hardware, leaves no residue, and carries no GWP or PFAS concerns.

How does GWP affect the total cost of ownership for fire protection?

GWP directly affects the total cost of ownership for fire protection because high-GWP agents are subject to increasing regulatory restrictions that drive up their price, limit their availability, and create compliance costs over the system’s lifetime. Choosing a low-GWP or zero-GWP suppression agent removes this cost exposure entirely.

The financial implications of high-GWP agents include:

Rising refill costs: As HFCs and other regulated gases are phased out of production, supply decreases and prices increase
Mandatory system upgrades: Regulatory deadlines may force costly retrofits or full replacements ahead of schedule
Compliance reporting: Many jurisdictions require F-gas reporting and auditing, adding administrative burden
Reputational and ESG risk: Organizations with sustainability commitments face scrutiny over continued use of high-GWP agents

By contrast, inert gas systems based on nitrogen have no regulatory exposure related to GWP. They also tend to have simpler maintenance profiles because they do not require the same handling precautions as pressurized fluorinated gas cylinders. Over a system’s full lifecycle, this translates into a meaningfully lower total cost of ownership.

When should businesses switch to a low-GWP fire suppression system?

Businesses should switch to a low-GWP fire suppression system when their current system is due for maintenance, refill, or replacement, or when they are planning a new installation. Acting at a natural transition point avoids the cost of replacing a functioning system prematurely while ensuring the next system is future-proof against regulatory changes.

There are specific situations where switching sooner makes clear sense:

Your current system uses HFC-227ea or another HFC with a GWP above 2,500, which is already restricted under EU F-Gas rules
Your organization has ESG commitments or sustainability reporting obligations that flag high-GWP agents as a liability
You are expanding or upgrading infrastructure and want to standardize on a compliant, future-ready solution
Your suppression agent is classified as PFAS, putting it in scope for the broader EU PFAS restriction under REACH
Refill costs for your current agent have risen significantly or supply has become unreliable

For organizations protecting enclosed equipment such as electrical cabinets, ICT infrastructure, or battery storage systems, the case for switching is particularly strong. These environments benefit from targeted, object-level suppression rather than room-flooding systems, and nitrogen-based solutions are well suited to exactly this kind of application.

How ExxFire supports the transition to low-GWP fire protection

ExxFire’s combined fire detection and suppression systems are built around nitrogen, an inert gas with a GWP of zero and no PFAS chemistry. The systems are purpose-designed for closed enclosures such as server racks, switchgear cabinets, battery energy storage systems, and high-voltage equipment, making them a direct, practical replacement for high-GWP gaseous suppression agents in exactly the environments where those agents are most commonly used.

Key features of ExxFire’s approach to environmentally friendly fire suppression include:

Zero GWP and PFAS-free: Nitrogen leaves no chemical residue and carries no regulatory risk under F-Gas or PFAS frameworks
Early smoke detection: Aspirating smoke detection triggers suppression before a fire develops, protecting hardware and limiting downtime
Non-pressurized storage: The patented Cool Gas Generator stores nitrogen in a solid, non-pressurized state, reducing installation complexity and maintenance requirements
Easy self-installation: Systems are pre-engineered and do not require special certification to install, lowering TCO from day one
Certified and tested: Systems are independently validated by CNPP France and DMT, part of TÜV Nord, giving procurement and compliance teams the documentation they need

If your organization is evaluating a move away from high-GWP or PFAS-containing fire suppression agents, contact ExxFire to discuss which system configuration fits your specific environment and compliance requirements.