The AirCurve™ 10 S BiLevel Machine with HumidAir™ Heated Humidifier operates on a set, higher pressure for inspiration and a set, lower pressure for expiration. The machine’s comfort features are designed to help the user adjust to the two delivered pressures. This is a bilevel machine delivering one pressure for inhalation and one for exhalation while monitoring the length of the breaths and responding to alter the timing as needed to maintain the respiratory cycle.