Patient interfaces

A respiratory mask comprising:

• a mask assembly including:
• a seal comprising a nasal sealing portion and an oral sealing portion, the nasal sealing portion configured to seal on an under-side of a patient's nose, the seal configured to provide a flow of breathable gas to a user's nose and mouth;
• a housing comprising a front and a back, such that in use the front of the housing is distal to the user's nose and mouth and the back of the housing is proximal to the user's nose and mouth,
• wherein the seal and housing form a breathing chamber;
• and
• a frame that is removably coupled to the mask assembly, the frame comprising:
• a main body defining at least one headgear connector;
• an inlet opening through which a supply of pressurized air is provided to the mask assembly;
• and
• an anti-asphyxia valve assembly in fluid communication with the inlet opening,
• wherein the anti-asphyxia valve assembly comprises a valve housing integrally formed with the frame,
• wherein the main body of the frame defines at least a portion of a gas flow passage of the anti-asphyxia valve assembly,
• wherein the housing defines a curved surface that is recessed into the front of the housing towards the back of the housing, wherein the curved surface accommodates at least a portion of the frame comprising the anti-asphyxia valve assembly, wherein the curved surface of the housing matches a curvature of a portion of the anti-asphyxia valve assembly.