ok recieved them 2 day's ago, the guy is genuine enough.
now the problem and sadly much as i thought where the fan is sited under the HDD bay (no HDD fitted internally) i feared that it would not cool the reciever as the heat is being generated form the rear of the device ie the tuner and cpu so even with the fan running 24/7 it made absolutely no difference.
so i'm back to using the 7 inch mains powered fan blowing across the back of the unit noisy but cool
the search for the ideal answer goes on.
regards: canthackit