I saw an oxygen concentrator that gives out 1 litre of oxygen per minute at 90% purity but at 7 litres per minute the purity drops to 26%. What does it mean?
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Portable Oxygen Concentrator DEAL, 15% off (for $483.99), 93% Oxygen Concentration, Adjustable 1-7L Flow Rate : r/everydayblackfriday
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