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Detached Member
Join Date: May 2003
Location: southern California
Posts: 26,964
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They all push the O2 level from 20.8% to around 19.5%. Very, very expensive systems. Others are right, Halon is no longer allowed in new systems. Ozone depleting. You can breathe very high levels of CO2, its the O2 you can't live without.
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Hugh
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