My friend has a PC fan that she would like to power through a wall outlet(not for a PC but for other purposes). I've found a few adapters online, but I'm not sure about the voltage. I have no clue how any of that works.
The fan she has is a 4pin molex that says the "started voltage" is 6V/7V Max.
I don't see why it wouldn't. Worst case scenario it just simply won't turn on.
If you read the feedback it appears alot of people are using this particular product to do the very same thing you are wanting to do.