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what is the difference between FM200 and Halon 1301 total flooding system?
http://www.google.co.uk/search?sourceid=navclient&aq=hts&oq=&ie=UTF-8&rlz=1T4SKPT_enGB409GB409&q=what+is+the+difference+between+FM200+and+Halon+1301+total+flooding+system
What do the TDS (Tech Data Sheets) from DuPont say?
[edit] Or, I guess someone might will do your work for you.
One remarkable thing about Halon 1301 I learned in my Navy days is that it is temporarily breathable allowing time for escape.