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Thanks for many good points and yes the fan is $300+ so I for sure do not want to destroy it. Would it make sense to put a say 100 Ohm resistor in series with the Qubino to reduce the risk of overcurrent to the fan speed controller?

Anything special I need to think about electrically when using a dimmer instead of a potentiometer - i.e. an independent 0-10V source rather than the EC motors own 10V source powering a potentiometer?! I need to use connon earth I assume but in additional to that?

I need a z-wave controled potentiometer and got a suggestions that one could use a Zuno and a MCP41010 - anybody that already have tried this and can share some experiences, a schema how to connect it together etc? I need this to control an EC motor (in a fan) that has a built in potentiometer (0-10...