The CFJET series cyclo-filters are made with a circular structure with tangential air inlet, designed to combine the centrifugal separation effect of cyclones with the efficiency of the dust collectors. They are provided with sleeves or cartridges with a cleaning system with counter-current compressed air jets and depression operation. They combine the advantages of centrifugal separation typical of cyclones with the filtration efficiency of dust collectors and are used for the treatment of air with large concentrations of fine, coarse or filamentary materials. The particular construction makes them suitable for working with high negative pressures, coupled with fans or vacuum pumps. The ATEX versions are made of specific components and explosion-proof panels that allow installation in zone 22 and the treatment of potentially explosive powders.