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[PSUBS-MAILIST] Rebreathers relief pressure



Hello Psubers!
 
I have one dumb question to ask, maybe i´ve got some wrong concepts about rebreathers / life support... 
I´ve been on this list for some time, but as this is my first e-mail to the group, i think you will forgive me for this basic question. ;)
 
Here it goes:
 
How is the pressure in a 1 atm sub controlled using a rebreather inside the sub? Does it have an over pressure relief? How is this gas that is coming out the rebreather system purged from the pressure hull, so that there isn't an increase in cabin pressure?
 
 
Fabrício Soares