As you are breathing from the Oxygen Reservoir Bag, not directly from the O2E2 Machine (or oxygen machine), the flow rate of the oxygen concentrator is not critical.
The commonly used flow rates are 5LPM and 10LPM.
However, the oxygen machine with a higher flow rate will fill the Reservoir Bag quickly. 10 LPM will fill the 900 Liter Reservoir Bag in under 90 minutes and 5 LPM will take 180 minutes (approx 3 hours).
You can keep the O2E2 machine running while you do exercise to add extra oxygen so you can reduce fill time for the next session. 10 LPM machine will add 150 liters of oxygen during a 15-minute workout session. 5LPM will add half of that (approx. 75 liters).
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