Patent ID: 6918951

Claim:
An air filter, comprising: a housing having an air inlet, an air outlet, and a stack of filter discs within the housing for removing solid particles from the air passing from said inlet to said outlet; said filter discs in the stack being formed with contacting faces having surface formations defining filtering passageways between adjacent discs for removing solid particles from the air passing through said stack of filter discs; said filter discs in the stack including electrodes spaced from each other axially of the stack and connectable to a voltage source for producing an electrical field attracting solid particles towards the discs to thereby enhance removal of the solid particles from the air passing through said stack of filter discs; characterized in that said filter discs in the stack include a first plurality of insulating discs of insulating material alone, and a second plurality of electrode discs of electrically-conductive material alone, with the electrode discs separated from each other by at least one insulating disc.