Industrial Clean Agent Systems are colourless gas at standard conditions, exhibiting a boiling point of -16.4 ° C. The Systems works by physical action, the molecules absorb heat so that the temperature of the flame falls to a point below which it cannot propagate, and the fire is extinguished. The Systems mix well in a protected enclosure to provide a homogenous mixture in air. The Industrial Clean Agent Systems is pressurized to achieve rapid discharge into the protected environment.