Abstract: The invention relates to an air extraction device (2) comprising an intake opening (4), a downstream air duct for an air flow (L), said air duct extending in a first section through a rotatingly driven fan wheel (6) radially outward and extending in a second section downstream of the outlet openings (5) of the fan wheel (6) such that the air flow (L) is deviated in an approximately axial direction to the fan wheel (6), and runs into an exhaust opening (8). The second section has a lateral wall (10) that is arranged opposite to the outlet openings (5) of the fan wheel (6) at a distance thereto. The aim of the invention is to improve the capacity of the air extraction device. For this purpose, the second section comprises a through-flow compartment (12) arranged in the plane of rotation of the fan wheel (6) which compartment is arranged downstream of the outlet openings (5) of the fan wheel (6), which is radially limited by the lateral wall (10) and in which no air guideways are arranged.

Abstract: The present invention relates to a fume extraction hood (2) having an exhaust opening (4) for leading away exhaust air (A) and an inlet opening (6) for feeding inlet air (Z), disposed adjacent to the exhaust opening (4). In order to achieve an inlet air guide, by means of which cooking vapors can be effectively captured and fed to the exhaust opening, the invention proposes that the inlet opening (6) is disposed and implemented so that the inlet air flow (8) flowing out of the inlet opening (6) in a direction oriented opposite to the flow direction of an exhaust gas flow (10) flowing into the exhaust opening (4), and the exhaust air flow (10) is deflected sideways via an extraction path (F).

Abstract: An exhaust hood having a first fan wheel sucking in and transporting away room air. A second fan wheel sucks in external air and is arranged axially displaced relative to the first fan wheel. Guide vanes are arranged externally about the first and second fan wheels. The guide vanes are embodied as a cavity and form venting passages. A first air flow exiting from the first fan wheel and a second air flow exiting from the second fan wheel are guided past each other, separate from each other, through the guide vanes and are directionally deflected by the guide vanes. Walls of the guide vanes form a surface for heat exchange between the first and second air flows.