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I agree that you definately want to avoid a high PO2 in the chamber. Every 
BIBS that I know of has an exhaust line so on exhalation (or in the case of 
overpressure) it is not vented to the chamber but to the outside. I am not 
aware of any other systems in use.


>From: mat.voss@t-*.de* (Matthias Voss)
>To: Isaac Callicrate <icallicrate@ho*.co*>
>CC: johnny_chri@ho*.co*, techdiver@aquanaut.com
>Subject: Re: Dr Black/ChamberHaters
>Date: Wed, 12 Dec 2001 22:23:10 +0100
>
>Take great care when using overprssure masks in a chamber with oxygen
>rich gas. The reason why is obvious.... at least avoid all sources of
>combustion, leaks, and sense environmental oxygen, have a system of
>flushing the chamberatmosphere.
>Matthias
>

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