| http://www.w3.org/ns/prov#value | - a vent assembly provided to exhaust CO2-laden gas from the mask or a conduit provided to the mask, the mask or conduit including an opening delineated by a rim, the vent assembly comprising an insert attached to the mask or conduit and including a plurality of gas washout orifices, each orifice extending from an inner side of the insert to an outer side of the insert, each orifice being open in us
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