| 摘要 |
An exhaust system for evacuation of vapor and gases from an area, the system including a fan mounted on a motor, an activation circuit coupled to the motor and adapted to couple the motor to a first voltage source, a detection circuit adapted to sense the presence of moisture on a sensor surface and to generate a detection signal when moisture is sensed and to not generate a detection signal when moisture is not sensed, and a control circuit. In one embodiment the control circuit is coupled to the detection circuit and the activation circuit and adapted to generate a control signal in response to the detection signal, the control signal received at the activation circuit to cause coupling of the motor to the first voltage source after a delay programmed in to a programmable logic chip in the control circuit.
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