yeah just put it on the back. the flexible hose should work well for you. PC fans are really quiet, and most manufacturers give detailed specs on pc fans including cfm(how much air they move), as well as db level(how much noise it makes). here's a really good site that has awesome prices in addition to all the specs.

computer case fans
fluid69 Reviewed by fluid69 on . Stealth Grow. So I have just started a two new little projects. Im kind of new to all this stuff. I would appreciate advice and comments. First, I have turned a peice of luggage into a veg box. Second, I have turned part of my desk into another little grow box. Tell me what you think. Rating: 5