Fume-treating device and fume ducting system for cooker hoods

A fume treating device and fume passage of a cooker hood having a bottom fume passage and a top fume passage, characterized in that the top portion of the bottom fume passage is provided with the top fume passage and the side of the bottom fume passage is a bottom fume-suction inlet in communication with the top fume passage, a protruded platform of the bottom section of the bottom fume-suction inlet is mounted at the bottom fume passage inlet, and the fume-suction inlet is detachable which is an oil-suction framework having a pivot rod for the inclined board of the bottom fume passage, and an oil suction material is provided at the oil suction framework, the top end of the top fume passage corresponding to the top portion of a stove is mounted with a top fume-suction inlet, and two protrusions are provided to the top of the inclined board of the bottom fume passage, the protrusions and the side wall of an outlet form into an engaging slot for mounting a filter thereon, and the outlet of the bottom fume passage corresponding to the inner side of the fume passage is provided with a fume filter, and a securing frame is used to secure a ventilation fan connected to one end of a tube.