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It occured to me that another issue arrises with scrubber failure
in any breather which is keyed to respiratory rate ie Odyssey, 
AGA ACSC, Fenzy, BMD SCR/4 etc.  The operation of the system is dependent 
upon a narrow relation ship between respiratory minute volume RMV and 
O2 consumption VO2.  B&E give 

K = RMV/VO2

15 <= K <= 30

However repiratory rate is effected by FiCO2.  Hence in the event
of a scrubber failure ( even partial ) one could expect K to increase
past 30.  This would lead to elevated FiO2.  Not what you want when
CO2 is also elevated!

Barrie

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