The principle of the positive pressure machine is to use impeller and turbocharging technology to convert the input low-pressure air into higher air pressure through two rotor devices. The positive pressure machine is driven by the engine, compresses its own air to a higher pressure, and then delivers it to the system to drive other accessories to operate. The positive pressure machine extracts the air at the rated speed of the engine and transfers the motion energy to increase the air flow of the system.