Just a thought..
Check out
http://www.qwikflow.comThey have a 5V and 12V 25 x 25 x 10 mm DC fans.
of course that was just one of the first google results i got.. you can pretty much pick up any 25 x 25 mm DC fans u can get...
I d put two fans at each end of the tube in blow-suck (sounds dirty.. i know.. :-D ) to provide for a little more ventilation and cooling..
Just my 2 cents..
Oh and congrats on what i see is an upgrade to the old Aoyue iron..
Ersa??
:-)