Embodiments disclose a system, a method and an interface device for non-invasive ventilation, NIV, to a patient, and adapted to fit human faces having different facial geometries, characterized in that, the interface device comprises: a mask comprising: a casing adapted to form an enclosure around oral and nasal cavities of a patient; a plurality of bottom straps fixed to a bottom strap mount located at the bottom portion of the casing and a plurality of top straps fixed to a top strap mount located atop the casing; and a silicon liner or cushion adapted to fit the casing of the mask, said liner or cushion being adapted to comfortably fit facial skin of a patient, and reduce leakage of breathing gas, using Bilevel Positive Airway Pressure, BiPAP mechanism, wherein under higher positive air pressure, the liner is adapted to inflate and under lower positive air pressure, the liner is adapted to deflate.
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