As of the thermister, different
model has different speed. There's no unique thermister
standard to all items. However, the basic standard
of Thermister is, when the temperature is 25C, the
RPM is half of the max RPM speed; then the higher
the temperature, the higher the speed; then at 50C,
the RPM reaches its maximum RPM speed. As a reference
for you, following is one example of Thermister
(for model FD6025B12W11-R)