On a point of order;
It is a common misconception that Halon, like CO2, "removes oxygen from the air."
According to the Halon Alternative Research Corporation (
www.harc.org): "Three things must come together at the same time to start a fire. The first ingredient is fuel (anything that can burn), the second is oxygen and the last is an ignition source. Traditionally, to stop a fire you need to remove one side of the triangle-the ignition, the fuel or the oxygen. Halon adds a fourth dimension to fire fighting-breaking the chain reaction. It stops the fuel, the ignition and the oxygen from working together by chemically reacting with them."
Credit to
H3R Cleanagents who put it much better than I could.