A chimney smoke scrubber adapted for domestic use includes a chimney cap enclosure secured atop the chimney or flue pipe of a combustion unit. A blower is connected to the chimney cap enclosure to draw smoke and combustion gases from the enclosure and deliver them under pressure to a scrubber chamber....http://www.google.es/patents/US5395408?utm_source=gb-gplus-sharePatente US5395408 - Chimney smoke scrubber
