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p to 93% high oxygen concentration CECA molecular sieve Atomization function 7 liters adjustable large flow 48 hours continuous oxygen supply Noise reduction design Smart touch screen Intelligent voice broadcast remote control Oxygen concentration – WHO Technical Specifications stipulate output of >82% concentration of oxygen at max rated flow rate at 40 degrees C and 95% relative humidity (RH). Most high quality devices should have >90% output. Oxygen concentrators take air from your surroundings, extract oxygen and filter it into purified oxygen for you to breathe