Patent ID: 7942952

Claim:
An apparatus for filtering particulate matter from a gas, the apparatus comprising: a collector section comprising a plurality of parallel collector plates for receiving electrically charged particles borne by a flow of the gas; an ionizer section located upstream of said collector section, said ionizer section comprising a plurality of ground blades and a set of conductive ionizer blades parallel to said collector plates, said conductive ionizer blades each having a number of sharp teeth at least along its edges, in sawtooth fashion; and a fan for drawing the gas through said ionizer section and said collector section, wherein every other one of said collector plates in said collector section is connected to ground and a remainder of said collector plates are without any electrical connection, said remainder of collector plates thereby being arranged to be charged electrically by induction from said conductive ionizer blades when said conductive ionizer blades are charged to a high voltage.