A mask configured to assist the respiration of a patient with a gas inlet port positioned to connect a gas supply to the mask and direct gas flow towards a patient's skin; a scattering chamber with an inlet port and a plurality of outlet ports, the scattering chamber inlet port fluidly connected to the gas inlet port, and the plurality of outlet ports positioned to scatter the gas flow away from the patient's skin and towards the interior surface of the mask and a region between the patient's skin and the interior surface of the mask; and an outgas collector assembly connected adjacent the scattering chamber and positioned to collect an outgas emission expelled from the patient and eject the outgas emission from the mask.
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