Patent Number: 6,309,294

Title: Lab-hood vent system

Abstract: A generally closed lab hood having an opening closable by a movable door and connected to a variable-throughput suction source has a vent-control system having a sensor for detecting a velocity of flow of air into the hood and for generating an output corresponding to the detected velocity. A controller connected to the sensor and to the variable-throughput suction source receives the output and operates the suction source to set throughput of the source at a level corresponding to the output so that as the detected velocity increases the throughput of the suction source is increased and vice versa. The controller includes a sensor tube having an inner end opening into the hood and an outer end opening outside the hood and a sensor in the tube for detecting the velocity of air-flow therethrough. This tube is offset from the opening. The controller operates proportionally to set the throughput of the suction source relative to the air-flow velocity.

Inventors: Baumeister; Gregor (Krefeld, DE), Sadkowski; Manfred (Geldern, DE), Sefker; Thomas (Neukirchen-Vluyn, DE), Wedler; Sven (Neukirchen-Vluyn, DE)

Assignee: Gebruder Trox, Gesellschaft mit beschrankter Haftung

International Classification: B01L 1/00 (20060101); G05D 7/06 (20060101); F24F 11/02 (20060101); B08B 015/02 ()

Expiration Date: 10/30/2018