If it is desirable to control an exhaust fan based on the moisture
level in a room, this two-wire surface mount wall control makes that
possible. This control allows the setting to be adjusted from 20 to
80 percent relative humidity, with an 8 percent maximum relative humidity differential. It ought to be installed over its own
electrical box. The color is white. Suitable for use with most exhaust fans, including the Fantech and Panasonic exhaust fans offered by Energy Federation.