Electrical detection uses heat detectors equipped with self-restoring, normally-open contacts which close when a predetermined temperature is reached.
In the early 20th century, carbon tetrachloride was extensively used as a dry cleaning solvent, a refrigerant and as a fire extinguishing agent.
Halon 1301 had many benefits as a fire suppression agent; it is fast-acting, safe for assets and required minimal storage space.
The European Union is currently undergoing a similar mandated removal of installed Halon systems.
But the first practical automatic sprinkler system was invented in 1874 by Henry S. Parmalee of New Haven, CT.
These include DuPont's FM-200, American Pacific's Halotron, FirePro's FPC Compound, Plumis’ Automist and 3M's Novec 1230 Fire Protection Fluid.
In-kind gaseous agents generally fall into two further categories, halocarbons and inert gases.
Not in-kind alternatives include such options as water mist or the use of early warning smoke detection systems.