Patent ID: 9011215
Filing Date: 2015-04-21
Classification: B08B,F24C,F24F

Abstract:
1. A fume hood comprising: a hood portion connectable to an exhaust system and having a recess and a lower edge therearound, the hood portion being configured to cover a fume source, the recess having a vent through which fumes are drawn from the recess, the vent being positioned on a rising side of the recess and being covered by a grease filter, the recess being configured to create a buffer zone to help insure that transient or fluctuating surges in a convection plume from the fume source do not escape a steady exhaust flow through the vent; and a jet generator located at said lower edge and configured to generate a combination of first and second jets at said lower edge thereof, said first jets being relatively horizontal in direction and forming a planar jet and said second jets being relatively vertical in direction and forming a planar jet, said first jets being directed toward said hood portion recess; wherein the initial velocities of the horizontal jets are between 2 and 3.5 times the initial velocities of the vertical jets.