Not sure how well this will work for a computer, but I used a pair of them for intake and exhaust from a costume helmet this pat summer for Comicon.  Worked beautifully with a 9v battery for power supply.  kept helmet from fogging and made it acceptable to wear even in San Diego summer.  a little noisy when they are inside your helmet, but for a computer I'm sure the noise would be minimal. 

Question: What do you think about noise?
Answer: a little noisy when they are inside your helmet