Fume hood exhaust terminal having an ultrasonic motor drive...

Details Fume hood exhaust terminal having an ultrasonic motor drive... Fume hood exhaust terminal having an ultrasonic motor drive...

B - Operations, Transporting

08

B

B08B 15/02 (2006.01) F16K 31/04 (2006.01) F24F 13/14 (2006.01)

Patent

CA 2256985

A fume hood exhaust terminal for controlling gas flow in an exhaust duct has an electrically powered ultrasonic motor driven actuator for angularly positioning a damper in the terminal. The circuitry of the terminal includes a power failure detection circuit which includes the capability of storing sufficient power to place the damper in a preferred position until power is restored to the exhaust terminal.

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