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Campana extractora caracterizada por estar formada de dos filtros uno es de "superfina" un fieltro ligero de fibras de vidrio impregnadas de resinas sintéticas y el otro filtro construido en dos partes está formado por dos jaulas de tela metálica dentro de las cuales se coloca el carbón vegetal destinado dentro de las jaulas; el aire aspirado por el extractor pasa a través de éstos filtros dejando en ellos las impurezas que el aire aspirado posee.