Positive Pressure Self-Contained Breathing Apparatus (SCBA) is a self-contained open personal air breathing protective equipment. It stores compressed air through a high-pressure cylinder and forms a positive pressure environment higher than ambient air pressure in the mask through a pressure reducing valve, air supply valve and other systems, thus ensuring that users can breathe safely and smoothly in toxic, smoke, hypoxia and other dangerous air environments, and effectively prevent the inhalation of external pollutants.
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