If its a 5v fan and you run it on 16V you will fry it in about 30 seconds or so. I have done it twice and have 2 toasted fans to show for it. You are better off getting computer fans that run on 12V.
I don't even think you would get it up to speed and it would fry.
“The modern astrophysical concept that ascribes the sun’s energy to thermonuclear reactions deep in the solar interior is contradicted by nearly every observable aspect of the sun.” —Ralph E. Juergens