You’ll need a double relay which can switch 230VAC. A three position wall switch normally switches in position two the first input and in the third position the second input. Setting the switch to the first position result in no input for the fan, because the fan is powered separate it will run at the lowest speed.
If you want to be sure there’s no 0-10V input you can post a picture of the connection board of the fan.
I recently bought a new fan (R-vent XWVS) with a 0-10V input because I also wanted to control it with Homey.
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