Bilevel machines, often referred to as BiPAP, deliver two distinct air pressure levels—higher during inhalation and lower during exhalation. This setup supports a more natural breathing rhythm during sleep, especially when a single pressure level isn’t enough.

They’re commonly used in cases where breathing support needs to be more flexible or when higher pressure settings are required. Depending on the model, additional features may include humidification, backup respiratory rates, or detailed therapy data.