An oxygen concentrator is a medical device that provides supplemental or extra oxygen to a patient with breathing issues. The device consists of a compressor, sieve bed filter, oxygen tank, pressure valve, and a nasal cannula (or oxygen mask). Like an oxygen cylinder or tank, a concentrator supplies oxygen to a patient via a mask or nasal tubes. However, unlike oxygen cylinders, a concentrator doesn’t require refilling and can provide oxygen 24 hours a day. A typical oxygen concentrator can supply between 5 to 10 liters per minute (LPM) of pure oxygen.