Cooling fan for tube amp?


I added the Iso-Acoustic footers under my tube amp and see that I have about 2" of clearance and wonder if I someone could suggest a small fan that I could mount on my open wood audio rack to dissipate the heat from the KT88 and 6SN7 tubes in the amp?   If this has been covered before, please point me to the proper links.  Thanks.  
whitestix
Post removed 
^ it's a link.

You could also use a PC cooling fan Blue Tacked to the chassis.
I use an Airplate T7 cabinet cooling fan. This is a pair of fans which operate by a control which selects speeds, both manually and automatically by a setting the desired  temp. 

I use mine in open space mounted behind the amp in an open cabinet. At low speed it is very hard to hear with nothing else running. Mine is set up to pull air across the amps. (two amps - two sets of fans.) Works great!

Sold by AC Infinity.
Sold by AC Infinity.  I just looked at them, few to choose from, nice looking and reasonable. Rack or stack. I have a class a, or two, that sure could benefit from this.. Thanks for the suggestions.

Regards