I'm currently looking for a way to turn off the fans on an STF-8300M camera. I'm using the most up to date drivers, camera firmware and the new version of Maxim DL 6.07. The setting in MaximDL for "Enable Fan" doesn't have an effect regardless whether or not its selected.
If memory serves me, the fan can also be enabled/disabled in the ST-7/8/9/10 family and STL's as well.