Abstract: A system for pulmonary rehabilitation by the application of positive airway pressure, characterized in that the system comprises a source of pressurized air, a source of pressurized oxygen, control arrangement for enabling a control of the sources of pressurized air and pressurized oxygen, a source of sterile water, a source of heat, and an output arrangement for providing pressurized and heated air and oxygen to a patient. The system can be rendered portable by use of a mobile casing. Means can be provided for enabling an automatic following of a patient by the casing.