That's what I did...I run a 1000mA variable power supply and connected them to 3 Princess auto fans...and run them at the voltage that makes the least noise while providing enough air.
Still ended up being too loud for me so I bought some good fans at
www.ncix.com and they push 3x the air at half the noise. In my opinion, other than their tiny size, the PA fans are a temporary solution if noise or lack thereof is important to you.