A combination appliance comprising - a cooking hob, which is covered by a top plate or a worktop, in particular a glass plate, having an opening or a recess formed therein, and - an extraction device, which is arranged below the top plate or worktop and comprises at least one fan for sucking air from an area above the cooking hob through the opening or recess of the top plate or worktop and for conveying the air through an air channel of the extraction device, wherein the air channel of the extraction device includes a channel section, which is arranged downstream of the opening or recess and upstream of the fan, which channel section is arranged adjacent to components, in particular electrical and/or electronic components, of the cooking hob, the channel section thereby forming a barrier for preventing the conveyed air to get in contact with the components of the cooking hob, and wherein the channel section comprises - an upper portion, particularly a top edge or top surface, abutting a surface zone of the top plate or worktop, particularly of the bottom of the top plate or worktop, and - a lower portion, particularly a bottom surface, abutting and/or being supported by a wall section, in particular a bottom wall section or a side wall section or an intermediate wall section, of the cooking hob, characterized in that a lower end surface of the channel section wall (58a, 58b, 66b) is supported by a bottom wall section of the cooking hob - by a protrusion of the bottom wall protruding from a box or a compartment defined by walls, which comprise the bottom wall and a side wall adjacent to the channel section wall (58a, 58b, 66b), or - by a circumferential edge or border of a cutout in the bottom wall. - a cooking hob, which is covered by a top plate or a worktop, in particular a glass plate, having an opening or a recess formed therein, and - an extraction device, which is arranged below the top plate or worktop and comprises at least one fan for sucking air from an area above the cooking hob through the opening or recess of the top plate or worktop and for conveying the air through an air channel of the extraction device, wherein the air channel of the extraction device includes a channel section, which is arranged downstream of the opening or recess and upstream of the fan, which channel section is arranged adjacent to components, in particular electrical and/or electronic components, of the cooking hob, the channel section thereby forming a barrier for preventing the conveyed air to get in contact with the components of the cooking hob, and wherein the channel section comprises - an upper portion, particularly a top edge or top surface, abutting a surface zone of the top plate or worktop, particularly of the bottom of the top plate or worktop, and - a lower portion, particularly a bottom surface, abutting and/or being supported by a wall section, in particular a bottom wall section or a side wall section or an intermediate wall section, of the cooking hob, - an upper portion, particularly a top edge or top surface, abutting a surface zone of the top plate or worktop, particularly of the bottom of the top plate or worktop, and - a lower portion, particularly a bottom surface, abutting and/or being supported by a wall section, in particular a bottom wall section or a side wall section or an intermediate wall section, of the cooking hob, characterized in that a lower end surface of the channel section wall (58a, 58b, 66b) is supported by a bottom wall section of the cooking hob - by a protrusion of the bottom wall protruding from a box or a compartment defined by walls, which comprise the bottom wall and a side wall adjacent to the channel section wall (58a, 58b, 66b), or - by a circumferential edge or border of a cutout in the bottom wall. - by a protrusion of the bottom wall protruding from a box or a compartment defined by walls, which comprise the bottom wall and a side wall adjacent to the channel section wall (58a, 58b, 66b), or - by a circumferential edge or border of a cutout in the bottom wall.