Ventilation controller

Details Ventilation controller Ventilation controller

1991-06-06

1993-06-01

Joyce, Harold

Ventilation

Means combined with window

With air pump

236 44C, 454256, F24F 1100

Patent

active

052154980

ABSTRACT:
An affordable ventilation controller comprises a low cost and very stable carbon dioxide sensor and a remote-controlled louvered suction fan equipped with an air filter. The ventilation controller operates independently of any existing heating or cooling system that might be present in a closed room. The carbon dioxide sensor measures accurately the gas concentration level in parts-per-million (ppm's) as a ventilation index. When a predetermined ventilation index is exceeded indicative of bad ventilation, a remote-controlled suction fan equipped with a louver and an air filter is activated to draw in fresh air from the outside in order to regulate the CO.sub.2 concentration and provide good ventilation. However, if an exceedingly high concentration of CO.sub.2 is sensed, the controller inhibits the control signal to the suction fan, since such a high level might indicate the presence of a fire.

REFERENCES:
patent: 2131295 (1938-09-01), Persons
patent: 3249038 (1966-05-01), Johnson
patent: 4257319 (1981-03-01), Kucharczyk
patent: 4437608 (1984-03-01), Smith
patent: 4742761 (1988-05-01), Horstman
patent: 4755473 (1988-07-01), Nishino et al.
patent: 4776385 (1988-10-01), Dean
patent: 4819551 (1989-04-01), Vole
patent: 4911065 (1990-03-01), Van Becelaere
patent: 4928583 (1990-05-01), Taylor et al.
patent: 4960041 (1990-10-01), Kiser

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