Pulmonary Modulation Technology (PMT) represents a major advance in the field of respiratory care. PMT has made available a number of new treatment modalities that were not previously possible. PMT uses a unique adjustable Dual-Area-Valve mechanism to naturally sense and respond to a patient's pulmonary requirements and to provide reliable ventilatory support and treatment. The unique PMT technology and the contained mechanism have made it possible to develop single patient, disposable, automatic, portable ventilatory support and treatment products which provide maximum reliability, quality, and cost effectiveness. PMT is very responsive to the pulmonary needs of the patient. At high frequency the technology generates oscillations approaching the natural pulmonary frequency of the patient.