Quote Originally Posted by bigsmoke07
you can also buy inline duct fans at home depot i think they got a 100 cfm and a 250 cfm for like 20 for lower cfm and like 35 for 250cfm cheap as fuck and im makin my own cool tube way cheaper than buyin one check this website out
http://www.icmag.com/ic/showthread.php?t=40637
You want to make sure to check the maximum heat the fan can run under. I bought a 4" fan from there and it's rated for 120 degrees. I'm not sure if that would be a problem in the long run.