Patent ID: 8252098

Claim:
A filter system to create clean air intake within a defined enclosed space comprising: a defined enclosed space; an air conditioning filter which conditions the air within the enclosed space; a device for filtering nanoparticulate matter below 300 nm in size from ambient air within the defined enclosed space, said filtering device comprising: a recirculation path exiting said enclosed space and entering said enclosed space via said device for filtering nanoparticulate matter; and a bypass leading into said enclosed space via said device for filtering nanoparticulate matter; wherein said device for filtering nanoparticulate matter comprises at least one filter medium containing at least one filter material having a solid phase, and a fan or blower which blows or draws the air through the filter medium with sufficiently low air velocity in the filter medium such that the air has a long residence time in the filter medium, wherein adhesive encounters between nanoparticulate matter and the solid phase of the filter material are highly probable, this air velocity also being sufficiently low to ensure that, once adhesion has taken place, kinetic de-adhesion by the air flow is highly improbable and wherein the device for filtering nanoparticulate matter is configured such that most and/or all the air intake to the defined enclosed space occurs via the device.