Method and apparatus for controlling a fume hood

Details Method and apparatus for controlling a fume hood Method and apparatus for controlling a fume hood

1991-08-23

1993-08-31

Tapolcai, William E.

Ventilation

Workstation ventilator

Covered workbench chamber

454343, B08B 1502

Patent

active

052404552

ABSTRACT:
This invention relates to a fume hood controlling method and apparatus which reduces the amount of replacement air required to operate a fume hood by permitting the fume hood to operate at a relatively low face velocity in the absence of a containment affecting condition, but which is capable of detecting the occurrence of a containment affecting condition, such as the presence or movement of a user within a selected area of the face of the fume hood, and of increasing face velocity to a selected level in response to such detection. When the detected condition no longer exists, the control automatically returns the fume hood to the lower face velocity, preferably with a time delay. Maximum replacement air volume and minimum replacement air volume may also be controlled in response to such detection.

REFERENCES:
patent: 4105015 (1978-08-01), Isom
patent: 4528898 (1985-07-01), Sharp et al.
patent: 4706553 (1987-11-01), Sharp et al.
patent: 4741257 (1988-05-01), Wiggin et al.
patent: 4773311 (1988-09-01), Sharp

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