Automatic operation apparatus for ventilating fan

Details Automatic operation apparatus for ventilating fan Automatic operation apparatus for ventilating fan

1992-10-14

1993-10-12

Bertsch, Richard A.

Pumps

Condition responsive control of pump drive motor

Having timer or delay means

417 14, 417 63, 454343, F24F 7013, F24F 1102

Patent

active

052520307

ABSTRACT:
A smoke sensor detects a smoke density in a room so as to automatically start the operation of a ventilating fan when the smoke density exceeds a predetermined value, but stops the operation of the ventilating fan when the smoke density becomes lower than the predetermined value. When the predetermined time elapses after the operation of the ventilating fan is automatically stopped, the operation of the ventilating fan is restarted to produce an air stream in the room to be ventilated in order to make the smoke density uniform in the room, thereby it is possible to enhance the degree of accuracy for detection by the smoke sensor so as to make the automatic operation of the ventilating fan appropriate.

REFERENCES:
patent: 3672128 (1972-06-01), Heffron
patent: 3826180 (1974-07-01), Hayashi
patent: 4251026 (1981-02-01), Siegel et al.

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