Gas washout vent assembly for respiratory mask

摘要

A vent arrangement for a mask includes a mask component (2390) and a vent cap (2300) provided to the mask component, the vent cap including a base wall (2335) and a dome or raised portion (2340) that extends upwardly from the base wall, the dome or raised portion including a side wall with multiple vent holes (2330) arranged along the side wall, the vent holes being open in use at least during the inhalation and exhalation phases of the user's breathing cycle.