Ventilators can improve the patient’s breathing status and are generally recommended for direct use by a physician in a hospital setting. Some patients are at home, treating sleep apnea syndrome, which requires a ventilator every night to improve apnea and hypoxia at night. It is not recommended to buy a ventilator online and then adjust it at home, as it involves more medical knowledge. Ventilators can cause lung and airway damage if used excessively, and their parameters are not arbitrarily adjusted by doctors in the hospital, but according to sleep monitoring indications. In case of obstruction of breathing during sleep monitoring, doctors use ventilator to do pressure titration and adjust ventilator pressure. Nowadays, ventilators usually have a chip inside the machine, and after a period of time, respiratory engineers have to adjust ventilator pressure according to the chip record parameters, so it is not safe for patients to adjust the parameter range by themselves.