5 C above ambient sounds about right.
I have to admit, it's really nice to be able to work with the rad specs!
Why don't you just mount that rad outside? I mean, you'll never be able to live with either the heatload, or the airflow, never mind the noise!
A 120 VAC fan will be more energy efficient than a 12V DC fan, because of the ~20% energy loss in the AC to DC conversion.
Your power source is going to be a problem. If you're in an appt, you'll need to tap into the downstairs neighbour's ceiling fixtures
