Changes in NFPA 2001 Standard for Clean Agent Fire Extinguishing Systems
02 March 2012
Changes in NFPA 2001 Standard for Clean Agent Fire Extinguishing Systems, 2012 Edition.
 
With reference with the changes occurred in NFPA 2001 Standard for Clean Agent Fire Extinguishing Systems, 2012 Edition kindly note that the same have an impact on the minimum design concentrations for Class A and C Hazards, precisely:

• Class A minimum design concentration (MDC) is now required to be 1.2 times the Class A minimum extinguishing concentration (MEC), as established in accordance with UL 2166 (halocarbons) or UL 2127 (inert gases) or the heptane cup burner value, whichever is higher.

• Class C minimum design concentration (MDC) is 1.35 times the Class A MEC, as established in accordance with UL 2166 (halocarbons) or UL 2127 (inert gases).

The following data shows the new volumetric minimum design concentrations (MDC) for Class A and C hazards:



The following tables show the new minimum design concentrations (MDC) by weight for Class A and C hazards:

NAF S 125® weight requirements @ 20°C:

• Class A:  0.4834 g/m³
• Class C:  0.5016 
g/m³ 

NAF S 227® weight requirements  @ 20°C:

• Class A: 0.5150  g/m³ 
• Class C: 0.5483 
g/m³ 

At these concentrations both NAF S Fire Suppressants can be safely used in normally occupied areas.
We are currently reviewing our UL Listed Design Manuals for NAF S 125 and NAF S 227 Fire Suppression Systems and the same will be submitted to UL for approval. This procedure may take a few months. In the meantime we would like to encourage our distributors and their customers to use the new design concentrations and to inform fire authorities, consultants and engineers about the changes.
These changes apply to all gaseous fire suppression systems designed in accordance with NFPA 2001:2012, however we would like to remind you once again that our systems maintain unique features. Such unique features make of NAF S Fire Suppression Systems the best options to Halon 1301 and other solutions available in the market today: the unique detoxifying additive that makes HFCs safer for humans in a fire situation and the fact that our UL Listed range of assemblies includes seamless cylinders from 5 to 120 LT pressurized at 42 bar that allow the retrofit of existing Halon 1301 systems and the design of systems with long pipe-works.

For questions please contact technicalaid@safetyhitech.com