Why do we also call the air jet sieve an air-jet sieve shaker?

Why do we also call the air jet sieve an air-jet sieve shaker? The air jet sieve is not a simple sieve mesh but an instrument that uses a negative-pressure air jet to lift particles upward to collide with a transparent cover, and then small particles are carried away for the analysis of the powder’s particle size. Clearly, in this process, the air serves to vibrate the particles, which is why it is also referred to as an air jet sieve shaker.

AIR-200 Standard Air Jet Sieve Shaker by AimSizer