Process and device for drawing off vapors and fumes

摘要

In an exhaust hood (5) for cooking places or other kinds of sources of dust or fumes, on the front edge of hood (27) blast nozzle arrangement (26) is provided, which directs blast air (22) in the form of a wall jet approximately horizontally over the underside of hood (28) against filter (17) placed in the rear area of the hood, so that the wall jet draws the flow of fumes and carries it along. In a special embodiment of the exhaust hood, on the underside of the front wall of the hood, a downward directed swirl nozzle (38) is provided, which produces vortex flow (37) which empties into the blast air flow.