TFM-04 Fire Extinguisher License – A (FEL-A) Practice Test

Clean agent systems extinguish fires mainly by absorbing heat and interrupting the chemical reactions in the flame, which makes them effective for many common fire hazards. But when the fire involves reactive chemicals or metal hydrides, the extinguishing agent can react with the metals or reactive compounds, producing dangerous byproducts such as hydrogen gas or corrosive halogen acids, and may even worsen the situation. This kind of chemistry can lead to additional hazards or re-ignition, so clean agent systems are not used for fires involving reactive chemicals and metal hydrides.