Name three clean agents commonly used in NFPA 2001 systems.

• A. FM-200 (HFC-227ea), ECARO-25 (HFC-125), and Novec 1230
• B. FM-200 (HFC-227ea), Halon 1301, and Inergen
• C. Novec 1230, Inergen, and FE-13
• D. ECARO-25 (HFC-125), Inergen, and FE-14

Answer: (A)

In NFPA 2001, the focus is on clean extinguishing agents that extinguish without leaving residue and that can be used in occupied spaces with acceptable safety margins. FM-200 (HFC-227ea), ECARO-25 (HFC-125), and Novec 1230 are three clean agents that are widely implemented and recognized as suitable for total-flooding systems. FM-200 is known for effective heat absorption and fast discharge, making it a common choice for protecting equipment-heavy or sensitive spaces. ECARO-25 offers another clean, low-toxicity option with favorable environmental and performance characteristics. Novec 1230 is a newer agent designed to minimize environmental impact (low global warming potential) while providing effective flame suppression and occupant safety. Together, these three represent the modern, widely used clean agents specified for NFPA 2001 systems. Other options include Halon 1301, which is being phased out due to ozone depletion concerns, and inert gas systems like Inergen, which are not categorized as clean agents in the NFPA 2001 context; FE-13 and FE-14 are less commonly used in current practice.