I am searching for appropriate fans for my box, and was on the ADDA website
http://www.adda.com.tw/products/index.htm and noticed that they mentioned carrying DC blowers in a wide range of sizes and voltages. They might be worth checking out.
(I didn't because I'm looking for some really quiet fans, 120mm, ~80-90 CFM, 40 db MAX, must be able to maintain fairly good volume when pulling through a rad, ideally should have tach out, and possibly a remote thermistor speed control - suggestions welcomed)
Gooserider