On 5/17/2014 5:39 AM, Kurt Ullman wrote:
As I understand it, this is akin to the major reason you're supposed
to get out of a computer room if the Halon extinguishers are
triggered. The Halon itself isn't particularly hazardous (at the
concentrations used in these systems), but the combustion byproducts
from burning plastics and etc. are really nasty. The Halon suppresses
some of the flame reactions and stops the fire, but it doesn't get rid
of the poisonous partially-combusted plastics and other decomposed
flammables.

The reason you want to get heck out of a Halon environment is that is
displaces the oxygen so you have nothing to breathe. (It works on the
"air" part of the old fire triangle).


I've taken some fire training courses. Halon is low
enough levels, that one can remain in the room. I've
seen movies of a test dump. The guy looked a bit
frieked out but was OK at the end of the movie.

There were some system using carbon dioxide, and
those displace oxygen.

Halon works on the fourth side of the triangle,
sustained chemical reaction. Actually fire
tetrahedron.

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Christopher A. Young
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