Medical apparatus, namely, automatic positive airway pressure (APAP) devices; medical devices, namely, air pressure flow generators and humidifiers specially adapted for use with artificial respiratoration apparatus; apparatus for artificial respiration; continuous positive airway pressure (CPAP) devices; medical devices for screening, monitoring, and diagnosing respiratory disorders and structural parts and accessories specially adapted for all the foregoing, namely, chin restraints, water tubs, oxygen diverter valves, tubing wrap in the nature of insulation for air delivery tubes, air tubes, and filters, all specially adapted for use with medical devices for respiratory therapy; feedback controllers specially adapted for use with medical respirators and ventilators for artificial respiration; humidifiers specially adapted for use with a respiratory apparatus for artificial respiration for medical use; medical ventilators; medical apparatus, namely, nasal continuous positive airway pressure devices; medical apparatus, namely, non-invasive positive pressure medical ventilators; medical apparatus, namely, respirators for artificial respiration and component parts and accessories therefor specially adapted for use with respirators for artificial respiration; medical apparatus, namely, humidifiers specially adapted for use with continuous positive airway pressure medical devices