I have a bipap. I have oxygen connected to my bipap. I have a paralyzed rt diaphragm. Asthma/COPD. Restrictive airway disease. The bipap has 2 settings. One for breathing in and the other for breathing out. My numbers are 16/12. The 12 is for breathing out. I can’t breathe out easily. The first time I tried it my numbers were 21/18. My mask blew off my face. I have the nasal pillows. We had to adjust numbers so it would stay on. You have to have a sense of humor. It takes a while to adjust to it. When I first got it my breathing was so bad that using it was the only that I could breathe easily. Like any cpap or bipap, if you never had one, it can take up to 3 months to get used to it. The sounds etc. I found the full face mask was the most uncomfortable mask to wear. You might need a chin strap so you don’t breathe out of your mouth.