1980-12-08
1983-03-29
Makay, Albert J.
F23J 1100
Patent
active
043779697
ABSTRACT:
Laboratory fume hoods with open hood faces closed by door sash are provided with an automatic airflow control regulating the quantity of air drawn into the hood in response to movement of the door sash for maintaining a controlled velocity of air through the hood face to keep fumes within the hood while reducing energy requirements for either heating or cooling the air to maintain safe operation. The open hood face is controlled by a vertically slidable sash or window counterbalanced by a weight that is connected to the sash by a cable which moves directly proportional to the movement of the sash. This cable actuates mechanism for opening and closing a damper in the exhaust system for the fume hood. In one embodiment, the cable drives a pressure regulator which controls an air motor to rotate the damper. In other embodiments the cable may drive reduction gear to the damper or control a servo motor which drives the damper. A plurality of fume hoods may be connected to a single constant static pressure exhaust system with each hood having its own sash controlled damper to maintain an air flow velocity that will provide safe operation of each hood with a minimum energy consumption.
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Joyce Harold
Kewaunee Scientific Equipment Corp.
Makay Albert J.
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