The Vest® Airway Clearance System Model 105 is designed to help patients mobilize retained secretions. If secretions are not removed, the patient may have respiratory infection and may experience a reduction in lung function. The Vest® System assists patients who have airway clearance dysfunction, ineffective cough clearance, and secretion retention caused by immobility or muscle weakness to obtain airway clearance. The Vest® Airway Clearance System Model 105 showcases technology from the makers of High Frequency Chest Wall Oscillation or HFCWO. The therapy makes use of a device that gives off increase airflow speeds in order to create cough-like forces that decrease the viscosity of secretions. It helps transfer secretions found in smaller airways to larger ones where they can be removed easily through coughing.