The data sheet says continuous current of 0.8 amps for the transistor, the one there is 0.1 and I bought a new one that does 0.45 amps.
I am not exactly sure what I am talking about. It looks like it should be happy with 0.8 amps. http://uk.rs-online....istors/6254966/
Depending on the fan that transistor might need a heatsink?