Electric thermostatic fan blowing air OUT of the engine bay?
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Just looked back at pictures of your engine bay and bonnet and there are no convenient vents. Perhaps you could vent it out of the wheel arches?
I seem to remember the original Minilites were designed to suck air across the brakes. I am guessing sucking warn air across the brakes is not ideal so perhaps some flexi ducts (
http://www.i-sells.co.uk/ducting-flexible-hoses) positioned at the top of the arch out of sight?