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The working principle of a pressure fan is mainly based on the motor driving the gear to rotate, and then compressing the gas to achieve the blowing function. Specifically, when the motor drives the driving shaft to rotate through a coupling or pulley, the gears installed on the driving wheel will drive the gears on the driven wheel to rotate synchronously in opposite directions. This rotation creates a space between the casing and the rotor, where gas enters through the inlet and is compressed before being squeezed out of the outlet by the rotor. At the same time, the other rotor rotates to the opposite position of the first rotor at the beginning of compression, forming a new space with the other side of the casing. After entering this space, new gas is also compressed and urladdad .