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Because there is no convection in micro-gravity, air circulates very poorly.
Hence the need for multiple pumps and extensive ducting.
Apparently, the sleeping units each have a fan to keep the air moving - otherwise the crew can wake up gasping for air as an exhaled bubble of high CO2 content air can accumulate around the head!
Yikes!
Dean
Last edited by deanm; 22-01-2013 at 05:20 PM.
Reason: Spulling!
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