Patent ID: 7918907

Claim:
A particulate filtration device comprising: a filter media having an upstream surface and a downstream surface; an air moving device for moving air through the filter media from the upstream surface toward the downstream surface; and a cleaning assembly including a cleaning nozzle that accelerates gas toward the downstream surface of the filter media, the cleaning nozzle comprising: an inlet portion defining a converging inlet path; a throat portion defining a narrowest portion of the nozzle and a throat area; and an outlet portion defining a diverging path and ending at an exit edge that defines an exit area, wherein a ratio of the exit area to the throat area is from about 1.4 to about 1.6, wherein the inlet portion, throat portion, and outlet portion collectively create an inner surface of the nozzle, wherein the nozzle defines a centerline and an exit half angle relative to the centerline, and wherein the exit half angle is between about 10 degrees and about 13 degrees.