SG,
That makes sense then, because I recall from training (non aviation related) with the use of Halon was that the area had to be evacuated, sealed and entered only with breathing apparatus or a latent time of extractor fans working (20 mins I think at the site i worked), a solution that is obviously not practical with cargo hold fires I imagine.
I cannot imagine Halon being used in the Passenger cabin ?
FYI it was a large Underground Mainframe Installation in the UK in the mid '80s.
In any event, we'd just press the big Yellow button, call the firies and go to the pub
