Well, if it were a sine wave, it would be around 17V. However, if the 'transformer' is an SMPS, then goodness knows what waveform it is (so the peak could be anything from 12V upwards), and goodness knows how a simple multimeter would interpret the waveform. Such issues could, indeed, explain the OP's measurements.
I suppose so - but the concept of the 'power output' of a fan is an interesting one which, if taken literally, has nothing directly to do with the amount of electrical power consumed (other than establishing a lower bound for the latter, since Mr Physics doesn't like efficiencies >100%!)!
Fair enough, but (assuming you're still using it) are you sure that the cable that used to go from the output of the transformer to the 12V fan is suitable for mains voltage? What sort of cable is it, and does it have an 'earth'?found the transformer, have removed it wired in a junction box and can report all is working perfectly! Thanks for all your help, couldn't have gotten there without you
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