Fisher Hamilton, Inc.

Thomas A Grall

John M Bastian

Tony J Kopidlansky

Anthony B Castelli

Jon Zboralski

A fume hood includes a top, bottom sidewalls, front panel and a back panel that define an enclosed workspace. The fume hood also includes a movable sash for opening and closing an access opening. The fume hood also includes an air chamber having an inlet in the front panel. The air chamber includes a baffle system that evenly distributes the inlet air as the air travels through the air chamber. An unimpeded flow of air is discharged downward and away from the breathing zone of the technician and proximate to the sash to reduce the forward momentum of air trying to escape the fume hood. In an alternate embodiment, the fume hood also includes a pressure pipe for drawing a small quantity of air from the air chamber and directing a flow of air between the movable sash and the header panel. This flow of air from the pressure pipe increases the relative pressure difference between the movable sash and the header panel of the fume hood. This design reduces the amount of condition air that is exhausted from the room through the fume hood, thereby lowering the operating cost and increasing the efficiency of the fume hood.

Fume hood with air chamber and pressure pipe

A fume hood includes a top, bottom sidewalls, front panel and a back panel that define an enclosed workspace. The fume hood also includes a movable sash for opening and closing an access opening. The fume hood also includes an air chamber having an inlet in the front panel. The air chamber includes a baffle system that evenly distributes the inlet air as the air travels through the air chamber. An unimpeded flow of air is discharged downward and away from the breathing zone of the technician and proximate to the sash to reduce the forward momentum of air trying to escape the fume hood. The fume hood provides a safe environment for the technician to work by enabling the fumes to stay contained in the fume hood under all working conditions. The air passes through the air chamber when the movable sash is positioned at a minimum height above the bottom of the fume hood. As a result, the amount of condition air that is exhausted from the room through the fume hood is reduced, thereby lowering the operating cost and increasing the efficiency of the fume hood.

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Whitelaw, WI, United States of America

Thomas A Grall