If you cannot find your fan, you might want to have a look in Room 6 as Mr Holmes and his Year 10 pupils have been conducting wind turbine experiments using them.
The practical involves the pupils cutting out different sized paper turbines and placing them on a motor.
The fans turn each of the wind turbines, thus turning the motor which produces a different voltage value. The size of the turbine is important but because they are made of paper; the larger ones can often produce a lower voltage compared to the smaller turbines.
As a result pupils quickly learn bigger is not always better, it is the material the turbines are made from that is important.