This thesis investigates the effects of radiant heat flux on clean agent extinguishing concentrations. This data is sought to support standards that address Class C hazards. Using the REED apparatus, performance of clean agents IG-100, IG-55, IG-541, HFC-125, HFC-227ea and FK-5-1-12 at heat flux levels of 0-40 kW/m2 was examined. It was found that clean agent extinguishing concentrations increased with an added heat flux.

An alternate method of testing with the REED apparatus was also examined. Clean agents examined in the test were IG-100, IG-55, IG-541, HFC-125 and HFC-227ea at heat flux levels from 0-5 kW/m2. It was found that clean agent extinguishing concentrations increased by 33 to 45 percent from the original testing method. The new testing method was also found to be more repeatable and less time consuming.