1. The main applicable groups of the 3-liter oxygen generator and the 5l oxygen concentrator are different

　　The 3-liter oxygen generator is mainly suitable for pregnant women with mild respiratory system diseases, mild cardiovascular and cerebrovascular diseases, mild fetal hypoxia, and the third and higher populations. The 5l oxygen concentrator is mainly suitable for patients with moderate and severe diseases who often suffer from hypoxia, emergency requirements for sudden acute attacks, and oxygen inhalation for 10 to 24 hours a day: chronic obstructive pulmonary disease (COPD), chronic obstructive pulmonary disease (COPD), chronic obstructive pulmonary disease (COPD), chronic Bronchitis (old chronic bronchitis), chronic heart insufficiency, cor pulmonale, emphysema, pneumoconiosis, pulmonary fibrosis, etc.

　　2. The oxygen flow rate of the 3-liter oxygen generator and the 5l oxygen concentrator is different

　　As mentioned above, the oxygen concentration of the medical oxygen generator must be ≥90%. Limited to the current industry technology, the oxygen concentration of the oxygen generator will not actually exceed 96%.

　　For patients with acute attacks: chronic obstructive pulmonary disease, emphysema, pulmonary heart disease, chronic bronchitis, moderate to severe asthma, and other more serious patients, in the long run, many doctors will suggest that they should choose the 5-liter system Oxygen machine.

　　In normal times, the oxygen outlet flow of the oxygen generator can be selected at 2 liters/min. However, when the patient has an acute attack and has sudden wheezing, their breathing rate per minute is relatively high. At this time, we can temporarily increase the oxygen inhalation flow for emergency and relief purposes. To sum up, if conditions permit, in the long run, the supplier of oxygen concentrators recommends buying an oxygen concentrator of 5 liters and above.