Hello, type 2 respiratory failure is mainly accompanied by severe CO2 retention, low blood oxygen, and difficulty breathing. Bi-level ventilator can effectively discharge CO2, greatly reduce the number of hospitalizations, and improve the patient's life. Quality. At present, the ventilators with good curative effect, high comfort, reliable and stable quality are mainly imported brands. We recommend the ResMed brand, the inventor and technology leader of ventilators, the world's number one brand. You can go to its designated dealer. Go and find out, there are many models with different prices, there will be professional fitting personnel to choose the most suitable model for you, I hope it will be helpful to you!