fan controls

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Hello, I have a sleeping sound machine that uses a Fan to create white noise. It has a 3 position Switch, "off", "high speed", and "low speed". Essentially, these settings are either too loud or too quiet. I would like to remove the 3 setting Switch and replace it with a Potentiometer to...

Hi there! Is it possible to use the yellow wire of this kitchen hood controls to power a relay to control a remote fan motor? I would like to keep the remote fan running on with any of the different speeds of the Exhaust fan. Thanks