Air filtration assembly

Claim 1

An air filtration assembly, which comprises; (a) a support frame defining the periphery of an air-flow chamber which is open at first and second ends; (b) an air-permeable collector unit mounted within said chamber, closing the first end, said unit comprising, (i) a first web of a dielectric filter; (ii) a second web of a dielectric filter; (iii) electrode means comprising an electrical conducting grid sandwiched between the first and second webs; (iv) means connected to said grid for applying a positive electrical charge thereto; and (v) means for electrically insulating said unit from the support frame; (c) an air-permeable ionizer unit mounted within said chamber, closing the second end, said ionizer unit comprising, (i) a plurality of substantially flat blades having flat surfaces and opposed ends and positioned generally parallel to each other and spaced apart to form interposed air-flow passages between the second end and the collector unit; (ii) a plurality of insulator members with an individual insulator member on each end of each of said blades, resilient mounting means resiliently mounting each insulator member on each end of said blades so as to be resiliently movable along their length, said insulator members having a surface portion raised above said flat surface of said blades; (iii) a continuous length of electrical conducting wire mounted on each insulator member and stretched and threaded in a serpentine pattern on and between the insulator members on each blade end, said wire being spaced above said flat surface of the blade, said resilient mounting means being operable to maintain a taut condition of the wire between each insulator member; and (iv) means connected to said wire and said blades for applying a positive electrical charge to the wire and a negative charge to the blades.