Air cleaning device

  • US 8,211,374 B2
  • Filed: 07/19/2004
  • Issued: 07/03/2012
  • Est. Priority Date: 07/18/2003
  • Status: Active Grant
First Claim
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1. An apparatus for the treatment of air comprising a low power alternating current corona discharge ozone generator that has a power rating in the range of 4 watts to 50 watts mounted inside a chamber, the chamber being defined by an earthed casing comprising a metal or a plastics material impregnated or coated with a metallic material and having an air inlet and an air outlet, wherein the inlet and outlet are disposed in proximity to each other and the apparatus provided with a single filter mounted so that respective different portions of the filter occlude the inlet and outlet, respectively, and at least one air flow impeller formed and arranged for inducing a flow of air through said chamber from inlet to outlet in a non-rectilinear path, said ozone generator being formed and arranged for generating a restricted concentration of ozone and any other reactive species formed together therewith, within an inactivating zone contained within said chamber, through which said air flow is passed in use of said apparatus, which restricted concentration is sufficient effectively to inactivate airborne pollutant material entrained in said air flow, yet which restricted concentration decays sufficiently outside said inactivating zone so that the concentration of ozone in the cleaned air expelled from said apparatus is less than about 0.3 ppm without the use of an ozone decomposition catalyzer.

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