There are only two settings on the smartexhaust switch ventilation and delay.
Fan light time delay switch.
The duration of operation time for the fan can be adjusted from 1 to 60 minutes.
Moisture can remain on the bathroom walls and in the towels for a very long time.
The fan will automatically come on once per hour for the pre set ventilation time.
Both light and fan start together.
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Installed new ceiling fan and new switches and it still does the same thing.
When the light is turned on there is an approximate 1 second delay before the light actually lights.
Delay is the number of minutes you want the fan to run after the bathroom light has been turned off.
Delay will not activate until the light fan has been on for at least 10 seconds.
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But turning the switch off turns off the light but leaves the fan running for a preset amount of time.
Any manual fan operation and delay operation will be subtracted from the pre set ventilation time for that hour.
For the rocker version simply turn the switch off again after use.
Ventilation is the minutes per hour that you want the fan to operate.
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This switch will let the ventilation system perform its primary job preventing mold and mildew.