CONTROL OF EXHAUST SYSTEMS

摘要

Exhaust capture and containment are enhanced by means of automatic or manual side skirts, a sensitive breach detector based on interference effects, a combination of vertical and horizontal edge jets, and/or corner jets that are directed to the center diagonally from corners. Associated control functions are described.

主权项

1. A fume hood comprising:
a hood portion connectable to an exhaust system and having a recess and a lower edge therearound; 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.