Patent ID: 9505041
Filing Date: 2016-11-29
CPC Classification: B08B,B23K,F24F

Claim Text:
1. An extractor system comprising: a single blower having an inlet and an outlet; a single motor configured to drive the blower; a single positive pressure conduit fluidly coupled to the outlet of the blower, and configured to convey a positive pressure gas stream towards a work area; a single negative pressure conduit fluidly coupled to the inlet of the blower, and configured to convey a negative pressure gas stream from the work area, wherein the positive pressure conduit is disposed about the negative pressure conduit in an annular arrangement, and wherein a ratio of flow areas through the positive pressure conduit and the negative pressure conduit is between 4:1 and 0.7:1; and a hood coupled to receive the positive pressure gas stream and to direct the positive pressure gas stream around the work area, creating an isolated air region around the work area, and to draw airborne components from the work area into the negative pressure gas stream; wherein a flow rate of the negative pressure gas stream always exceeds a flow rate of the positive pressure gas stream, and wherein a ratio of the flow rates of the positive pressure gas stream and the negative pressure gas stream is manually adjustable by a user via an adjustment to alter an airflow from the outlet of the blower into the positive pressure conduit without altering a speed of the motor or the blower.