Exhaust apparatus and monitoring circuit therefor

Details Exhaust apparatus and monitoring circuit therefor Exhaust apparatus and monitoring circuit therefor

1976-07-13

1977-08-02

Caldwell, John W.

Communications: electrical

Systems

Call station

55274, 55DIG34, 340236, 126299D, G08B 2100

Patent

active

040400425

ABSTRACT:
The present exhaust apparatus has a housing with a tiltable front wall and a tiltable bottom wall. The front wall carries the fan unit proper with its drive motor and filter and the tiltable bottom wall may be provided with a light. In order to monitor the operation of the fan in response to the contamination of a filter, there is provided a membrane switch which responds to a predetermined reduced pressure in a space between the filter and the exhaust fan, as well as a further circuit means which respond to the power consumption of the fan motor. The membrane switch and the further circuit means may be arranged in parallel or in series with an alarm device such as a light or a buzzer.

REFERENCES:
patent: 2074152 (1937-03-01), Mueller
patent: 2172399 (1939-09-01), Mueller
patent: 2523967 (1950-09-01), Nystul
patent: 2700362 (1955-01-01), Calling
patent: 2707879 (1955-05-01), Dwyer
patent: 3201772 (1965-08-01), Ladusaw
patent: 3505791 (1970-04-01), Breslin
patent: 3552098 (1971-01-01), Cochran
patent: 3738088 (1973-06-01), Colosimo
patent: 3811250 (1974-05-01), Fowler, Jr.
patent: 3812370 (1974-05-01), LaViolette

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