Halon Gas

Like, how does it work?

Edited
He is not used much if at all Thanks to our generally uninformed and cowardly Congress that, by ratifying the 1987 Protocol of Montreal first banned along the phase-out of Freon refrigerants.
Halons are / were the best fight against the fire (LPG) never developed agents not only for computer rooms, but for boats, ships, aircraft, military, public buildings and family housing . It was delivered by hand portable fire extinguishers and fire protection systems prepiped activated by the usual methods of fire detection.
Halons not smother the fire, but chemically react directly with the combustion process a bit like an anti-catalyst. A 4-1 concentration of 5% was all that was needed and there was no respiratory hazard for staff at these low concentrations. So everyone (except Brazil, China, India, Korea, Mexico, Pakistan, etc.) have had to revert to less efficient, high-pressure CO2 is indeed a poison gas.

Furthermore, the refrigerant according to start phasing out is very fast R-22, a destroyer of Oxone "infant" is used in residential air conditioner for everyone. It was supposed to be the refrigerant Freon-type one that was to be maintained, but it was subsequently added to the list of results. There was considerable opposition to its conclusions because the evidence was circumstantial, and say, "what if" predictions were highly speculative - be based on computer modeling untested. The "Warning Gorebal" fiasco was followed ten years later ..

Google your question
Halon is a heavy gas. It replaces the air in the room
The fire needs three things to survive, if you cut one of them will die!
Something that burns a fuel
Something to oxidize
And heat

works on, y in a closed room, like a computer room.
It is expensive, but causes no damage to equipment.

Hopefully this answers your question correctly

Remember, never enter a room where Halon was released until it has been fully ventilated. Death by asphyxiation is sure to follow if it did not.