Abstract: Embodiments of the present invention provide a device, system and method for providing mask assemblies for use in the treatment of respiratory conditions and in assisted respirations. In an embodiment of the invention, a respiratory mask assembly can include a mask shell assembly, an inlet connector, a mask cushion and an adjustable forehead support. The mask shell assembly can include a central shell body with an inlet aperture for receiving a delivered amount of gas, and a rear mating edge. The inlet connector can include at least one non-circular exhalation port and can be rotatably disposed around the inlet aperture of the central shell body. The mask cushion can have a front mating edge for attaching it to the central shell body. The adjustable forehead support can have an extension bar, at least one forehead pad, and at least one locking tab that can be coupled to the central shell body.