I have a 2-pin 40 mm axial fan as part cooling fan. I don't post a link because I would like a general answer.
It runs on 12 V and when I start it at less than 40% it doesn't start. Even if I start at 100% and then I reduce the speed, at about 30% it stops.
When I read reviews online, I see people use fan speeds down to 10%, which no fan I have ever used can achieve.
How can I pick and connect a correct fan for part cooling, so that I can freely set the speed down to 10%?