Ventilation – Having outlet airway – With air pump
Patent
1997-12-22
1999-01-19
Joyce, Harold
Ventilation
Having outlet airway
With air pump
34235, 454 16, F23L 1700
Patent
active
058608583
ABSTRACT:
An airflow booster fan and control device therefor, the booster fan, preferably of the centrifugal, axial flow type, adapted for in-line installation into a length of duct or at the remotely located end of the duct in an air transfer duct system. The duct system may be one which removes heated and moistened air from a clothes dryer and particularly where the duct system is remotely located from the dryer. The control device delivers electrical power to the booster fan when an air pressure signal from within the duct system in close proximity to, or within, the booster fan is sufficient, as indicative of e.g. clothes dryer operation, to activate the control device to do so. However, a time delay relay in the control device maintains the booster fan in operation after each activating pressure signal for a predetermined length of time, after which the booster fan will be shut off. If there is still air pressure buildup in the duct system, the booster fan will be reactivated for another time to shut off delay period. The control device may be mounted directly to the booster fan housing or to adjacent or remote building support structure, the only requirement therebetween being the interconnection of electric power transfer cable between an electric power outlet and the control device and between the control device and the booster fan, as well as an air pressure transfer conduit from the booster fan or adjacent duct and the control device.
REFERENCES:
patent: 3099201 (1963-07-01), Gotlieb
patent: 4352453 (1982-10-01), McNabney
patent: 4576331 (1986-03-01), Harwell
patent: 4589331 (1986-05-01), Villamagna et al.
patent: 5209697 (1993-05-01), Hurst et al.
Joyce Harold
Prescott Charles J.
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