P the invention relates to a fan extractor. / p & & p & a fan extractor constituted by three rings 2, 3, 4 are assembled rigidly comprises an opening 5 in the center of which is a jet of water 6. A rotor 8 of a foam with open pores rotates at the center of the sleeve 3 which carries a snail collector 16 and of the helical grooves 18 are directed obliquely towards the collector 16 in the direction of rotation of the rotor 8. The walls of the shell 3 are frustoconical and diverge in the direction of the manifold 16. The present invention applies to dust removal of the atmospheres very highly charged with dust. / p
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