Is oxygen produced in the oxygen making mechanism pure oxygen?

We usually require patients with chronic obstructive pulmonary disease to receive oxygen at low concentration, inhaling oxygen below 35%. Oxygen concentration is related to oxygen flow. It can be known by conversion relation that the oxygen concentration of 3.5 liters per minute is 35%. In the family, the oxygen concentration produced by the oxygen maker is above 90%. By adjusting the oxygen flow, the oxygen concentration in the patient can be reduced to less than 35%, and it will not be pure oxygen. Low flow and low concentration of oxygen can achieve the goal of treatment.