If you are looking for cheap, maybe try these

Newegg.com - MASSCOOL FDC12025S1M 120mm Case Fan - Case Fans

78cfm, 4 dollars.

Yate Loon High Speed 120mm Fan (40dBa, 88CFM)

88cfm, 4 dollars.

Newegg.com - Scythe DFS123812-3000 "ULTRA KAZE" 120 x 38 mm Case Fan - Case Fans

133cmf, 10 dollars.


Get like 2 or 3 of those, or half a dozen, who cares, wire them all up to a single ac adapter and there you have cheap cooiling, which may be good for your application. But the cheap inline fans from HD will probably work pretty well too.

Pros: Moves a blizzard of air, has a 4 pin molex type connector with a plug on the other side so you don't have to give up a connection just to hook it up, and a standard 3 pin for motherboard connection.
Cons: L-O-U-D. One of these is like having a small vacuum running, 2 of them is quite unpleasant db wise.
Other Thoughts: It dropped everything in my case a good 10C with just 1, and -15C with 2 of them. So I have no complaints as to what it does, but if quiet is your goal, or even reasonably quiet - get something else.

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Sounds like a quality 4 dollar part to me. I used to have a 110cfm 120mm fan on one of my computers years ago, but it was so loud already that it didn't make much more noise then it did already.

should i mount the fan in between the hole on the box and the exhaust hose or at the end of the exhaust tubing