text: Power supply safety standards for home medical devices - Battery Power Tips
  Automatic CPAP features are essential due the expected use by untrained operators. The device reacts to the patient's breathing breath-by-breath and the machine's reading of these reactions eliminates the need to adjust settings by at-home healthcare operators. In addition, the CPAP machine offers climate control, which automatically adjusts humidity and temperature of the delivered air. Humidity and temperature measurements provide optimum comfort and protect the patient from condensation in the mask and tubing.
  The at-home environment may contain a variety of electromagnetic noise emitting devices that could interfere with the functioning of medical equipment and sensors. Home medical devices must meet stricter requirements than traditional medical equipment to limit potential interference their own emissions. For example, traditional medical equipment must meet CISPR 11 class A emissions, while home medical equipment must meet the stricter class B limits.