Air cyclone is a method used for removing particulates from an air stream, without the use of filters, through vortex separation. Rotational effects and gravity are used to separate mixtures of solids and fluids. A high speed rotating air-flow is established within a cylindrical or conical container called a cyclone. Air flows in a spiral pattern, beginning at the top of the cyclone and ending at the bottom end before exiting the cyclone in a straight stream through the center of the cyclone and out the top. Larger particles in the rotating air stream have too much inertia to follow the tight curve of the air stream and strike the outside wall, falling then to the bottom of the cyclone where they can be removed. In a conical system, as the rotating air-flow moves towards the narrow end of the cyclone, the rotational radius of the air stream is reduced, separating smaller and smaller particles from the air stream. The cyclone geometry, together with airflow rate, defines the cut point of the cyclone. This is the size of particle that will be removed from the air stream with 50% efficiency. Particles larger than the cut point will be removed with a greater efficiency, and smaller particles with a lower efficiency.