Patent ID: 9266154
Filing Date: 2016-02-23
CPC Classification: B08B

Claim Text:
1. A fume extraction cabinet, comprising: a housing in which a working chamber is located, said working chamber having an opening at a front side and being closed by a rear wall and lateral side walls; and a plurality of air jetting devices providing a means for directing a flow of air inwardly directly from the opening into the working chamber, wherein said air jetting devices are constructed of flow-profiled parts having a hollow section and with a leading end of the flow profile pointing outwards of the working chamber and an open end of the hollow section facing inward and toward the rear wall of the housing, said hollow section of the flow-profiled parts being fluidly connected with a positive pressure air supply providing, in use, pressurized air into the hollow section and out of the open end into the working chamber, wherein at least one of the air jetting devices is positioned at a front edge of the bottom wall and at each of the side walls of the housing, the air jetting devices being configured and oriented in a manner creating, in conjunction with said positive pressure air supply, a flow of pressurized air from the open end of the hollow section into the working chamber at an acute angle relative to and away from internal surfaces of the bottom wall and side walls of the housing, the open end of each hollow section being positioned facing toward a rear wall of the housing in a manner creating a means for causing the flow of pressurized air therefrom to substantially eliminate wall friction with respect to air flowing in the working chamber and enabling air to flow inwards above the walls of working chamber and for enabling the flow of pressurized air to prevent the formation of dead air spaces in which harmful substances can accumulate at the side walls and bottom wall of the working chamber.