Patent ID: 7708813

Claim:
A filter media for an active field polarized media air cleaner comprising: a first pad of filter material; a second pad of filter material; a first air permeable screen disposed between said first pad of filter material and said second pad of filter material, the resistivity of said air permeable screen being greater than the resistivity of said first pad of filter material and greater than the resistivity of said second pad of filter material; a conductive center screen disposed adjacent to said second pad of filter material; a third pad of filter material disposed adjacent to said conductive center screen; a fourth pad of filter material; a second air permeable screen disposed between said third pad of filter material and said fourth pad of filter material, the resistivity of said second air permeable screen being greater than the resistivity of said third pad of filter material and greater than the resistivity of said fourth pad of filter material; a pad of mixed triboelectric material comprising fibers from different parts of the triboelectric scale; said pad of mixed triboelectric material being disposed adjacent to said fourth pad of filter material; and a fifth pad of filter material disposed adjacent to said pad of mixed triboelectric material, wherein said fifth pad of filter material is less dense than said pad of mixed triboelectric material.