Fire extinguishers
500.
If you have ever been in the the locker room and anyone uses phoo phoo you will know how difficult it is to breathe in a confined cockpit when you let off a powder extinguisher and you will be unable to see. You will go to sleep very quickly. Similarly with a CO2 agent.
Halon is the only cockpit approved extinguishing agent(see JAR-OPS 3.790). It can be used to put out the fire but you MUST ventilate quickly afterwards.
No agent is really human friendly so we have to settle for the least nasty.