Vahterus Oy

Oy Hydrocell Ltd.

Abb Power Oy

Markku Lampinen

Mauri Kontu

Tomi Erkki Anttila

Keijo Rauhala

A filtering method and a filter device () for removing impurities from the breathing air () in a room, an air raid shelter or a vehicle. According to the filtering method, the air to be filtered is driven through a carbon dioxide filter () by a fan (), with the result that at least a portion of the carbon dioxide and/or mold spores and other impurities in the air are trapped in the carbon dioxide filter. After the filtering, the filter is regenerated and the carbon dioxide and/or mold spores trapped in it are removed by a technique whereby air heated by a thermal resistor () is passed through the filter, this air preferably consisting of the same air to be filtered.

Filtration method and a filter device for removing impurities from the air of a limited space and an apparatus for removing carbon dioxide from the air of an air-raid shelter

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Espoo, Finland

Markku Lampinen