Patent ID: 6935570

Claim:
A ventilation system comprising: a housing including: a ventilation controller; a means for electrically connecting a power source to said ventilation controller; a faceplate located on said housing; at least one switch located on said faceplate; and at least one humidity sensor in communication with, and providing data to, said ventilation controller; and an exhaust fan electrically connected to said controller, wherein said exhaust fan is remote from said housing, wherein said ventilation controller includes an integrated circuit selectively operable to provide power to said exhaust fan and wherein said integrated circuit includes means to calculate a first gradient value of humidity at a first time and a second gradient value of humidity at a second time, and means to provide power to said exhaust fan when said first gradient value and said second gradient value exceeds a predetermined threshold value, wherein the housing and the exhaust fan are contained within a room to be ventilated and wherein said at least one switch located on said faceplate includes a manual fan switch, said manual fan switch in electrical connection with said fan to bypass said ventilation controller.