My bathroom fan is on a Z-Wave switch and I use one of these to check humidity and motion.
Currently I have a simple piston that simply checks when the humidity drops 1 or 2 percent, waits 3-5 minutes, and then shut off the fan. I also use the motion sensor to keep the fan running even if the humidity drops if it senses motion. For better reliability, I also have a back-up Power Allowance rule to shut off after 20 minutes. It works for the most part although I have had the fan shut off mid-shower a couple of times.
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