No reason why not, they are ventilation fans after all ment for ventilating heat.

They don't seem to hold their CFM rating against much of a load though, so you want to keep a pretty free flowing air source and exhaust.. Much like a computer case does..

I'm using a pair of 95cfm 120mm fans right now, i know they aren't moving 95cfm each as I have some restriction in my intake and exhaust but they are doing the job fine. Best part is they are 12v DC so you can wire them up easily with a little DC adapter from Radio shack.

Just look at the current rating on the DC adapter, if it's say a 1500ma then it'll run two .75a fans. 1amp for every 1000ma the adapter puts out.