The SmartExhaust bath fan timer introduces a simple, smart, flexible, and economic solution for exhaust ventilation requirements. It is 
designed as a replacement for the bathroom fan and light switch. By using a microprocessor to monitor and control fan operation, a precise amount of ventilation can be provided.
There are only two settings on the SmartExhaust switch – ventilation and delay. Ventilation is the minutes per hour that you want the fan to operate. Delay is the number of minutes you want the fan to run after the bathroom light has been turned off. The delay time provides additional run time of the fan to complete ventilating the bathroom after use. The SmartExhaust is so smart, you can tell it you don’t need the fan to run when you leave the bathroom. When you turn off the light, turn it back on then back off again within a few seconds it tells the SmartExhaust you don’t want the fan to continue running.
With SmartExhaust, you can earn LEED and ENERGY STAR points for enhanced exhaust ventilation and it makes standard bath fans ASHRE 62.2 compliant.