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Shower Extractor Fan
(self.homeassistant)
Home Assistant is open source home automation that puts local control and privacy first. Powered by a worldwide community of tinkerers and DIY enthusiasts. Perfect to run on a Raspberry Pi or a local server. Available for free at home-assistant.io
I have this setup, minus the occupancy sensor. Occasionally on really humid days, the fan kicks on by itself, but that is fine.