- The F&P 850 Humidifier is capable of operating in two control modes; 37 °C, 44mg/L for invasive therapy and 31 °C, 32mg/L for noninvasive therapy. - The F&P 850 System for noninvasive ventilation (NIV) is comprised of the MR850 Heated Humidifier with the MR290 Autofill Chamber and RT Series breathing circuits with circuit step-down options. - Humidity is delivered to one of three types of Nivairo™ face masks. These are available as vented and non vented full face masks.