Patent ID: 8529324

Claim:
A powered air cleaning system comprising: a flow path extending through the system from an inlet to an outlet; a motor-driven fan located along the flow path to draw particulate debris laden air into the inlet and rotate it about an axis to form a rotating flow that stratifies the debris laden air with the heaviest particles in the outermost orbits of the rotating flow; an ejector port for ejecting particulate debris laden air under positive pressure from the stratified rotating flow in the system; an air filter located within the rotating flow and across the flow path upstream of the ejector port and the outlet for filtering air from the innermost orbits of the stratified rotating flow, the air filter being elongated in the direction of said axis, the motor-driven fan operating to maintain a positive air flow pressure on the outer surface of the filter so that the rotating flow about the filter causes a self cleaning action on the filter; wherein the system includes at least two components defining a portion of the flow path through the system, the at least two components being a detachable fan housing containing the motor-driven fan and a detachable filter housing containing the air filter which the at least two components are separable from the system.