Its in a cabinet yes, on a shelf , no doors so air can escape the front, there is around 6 inches space above the fan on the box, (and plenty around the sides). The boys playstation 4 is on the shelf underneath (which does kick out some heat at times) but they're not on at the same time.
Realised I'd mounted the fan blowing air onto the box rather than away from it, don't know how much difference that would make but we'll find out as I've now got it blowing away from the box, lets see how it goes...
Couple of other questions ....
Is there anywhere in the software (woosh infinity) where I can view the temp of the CPU ? (Had a look through the menu's and cant find anything)
Also, what is the difference between standby and deep standby? reason I ask is at the moment when i put the box into standby the fan stays on so clearly power is still being supplied to the USB , but is there another layer of standby which kicks in later which will turn off power to the USB?
Otherwise I will have to turn the box off at the back when not in use.