Patent ID: 8075774

Claim:
A filter cartridge for use in a filter housing comprising: a filter cartridge having a plurality of stacked vertical filter plates, said plurality of vertical filter plates includes a front plate, a middle plate, and a back plate; said front plate having a plurality of substantially lateral projections, whereby said plurality of lateral projections are vertically spaced from each other and abut said adjacent middle plate creating separate filtering tiers between said adjacent front and middle plates; said back plate having a plurality of substantially lateral projections, whereby said plurality of lateral projections are vertically spaced from each other and abut said adjacent middle plate creating separate filtering tiers between said adjacent back and middle plates; said front plate having a plurality of filtering apertures, said plurality of filtering apertures positioned along said vertically extending front plate; said middle plate having a plurality of filtering apertures, said plurality of filtering apertures positioned along said vertically extending middle plate; and said back plate having a plurality of filtering apertures, said plurality of filtering apertures positioned along said vertically extending back plate.