Brushed radiator fans are usually single speed, with basic on/off function. There is no internal controller or electronics. Simplicity at its best. They don’t last as long but they are relatively ...

Well, I'm using Noctua fans which are damned well made. I was originally going with Redux fans, but I found them too noisy, so I'm going to return them in favour of NF-S12A PWM which come with a 1:2 ...