A system for delivering a pressurized flow of breathable gas to a patient includes a patient interface and a flow generator mounted on the patient interface. The patient interface is configured to contact the patient's head and includes a frame and a cushion supported by the frame and configured to sealingly connect the patient interface to the patient's face and form a chamber between the frame and the patient's face. An inlet port in the frame is configured to receive the pressurized flow of breathable gas. The flow generator is configured to generate the pressurized flow and is capable of creating a pressure of about 2-40 cm H