Apparatus for controlling the ventilation of laboratory fume hoo

Details Apparatus for controlling the ventilation of laboratory fume hoo Apparatus for controlling the ventilation of laboratory fume hoo

1990-09-28

1992-03-03

Joyce, Harold

Ventilation

Workstation ventilator

Covered workbench chamber

454 59, 454 62, 454340, B08B 1502

Patent

active

050922270

ABSTRACT:
Apparatus for controlling the air flow through a fume hood to maintain a predetermined average face velocity through an uncovered portion of an opening of a fume hood of the type which has at least one movable sash door adapted to cover the opening as the fume hood sash door is moved. The apparatus detects the position of each moveable sash door and calculates the size of the uncovered portion of the opening, measures the actual flow of air through the exhaust duct, and varies the flow of air through the exhaust duct responsive to door position signals and the actual flow signal for controlling a flow modulating means to maintain the predetermined average face velocity through the uncovered portion of the opening.

REFERENCES:
patent: 3811250 (1974-05-01), Fowler, Jr.
patent: 4105015 (1978-08-01), Isom
patent: 4706553 (1987-11-01), Sharp et al.
patent: 4893551 (1990-01-01), Sharp et al.
patent: 4982605 (1991-01-01), Oram et al.

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