The subject innovation is a more specifically to change the waste fluid discharge path from the suction force generated from the stove hood in the burner range hood from the concentrate so as to form a waste fluid source to be related to the kitchen range hood passage.; Range hood flow path of the present design, the kitchen range hood 2 and the heating container 4 and the waste fluid discharge duct (10) along the inner wall (5) between the space between which is installed in the vertical direction, the loading of the duct place was placed in characterized in that the plate selectively opening and closing the suction port 11 and 12 is installed to be opened and closed according to the driving time range hood, comprising a driving unit for limiting opening and closing the opening and closing plate. Accordingly, assist in thermal insulating function and the same insulating function plate as to have created the new suction passage and the discharge flow path improve the suction performance with the stove hood as zoom or or than the thinner discharge passage in the design between the stove hood and the heating container space .
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