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Thread: Maintaining cruise altitude while depressurised
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Old 12th Mar 2016, 08:25
  #19 (permalink)  
Chesty Morgan
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Join Date: Mar 2002
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Proper pressure breathing kit requires you to forcibly breath out against a lot more positive pressure than is provided by airline O2 masks. The stuff on airliners, whilst it might be called pressures breathing, most definitely isn't.
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