Are you looking for the fan specs or suggestions on where to find fans? I have a similar P/S, and it looks like it's a 70mm fan. If someone doesn't jump in with details, opening up the power supply might reveal a label on the fan that indicates what voltage it runs on, and you could measure how thick the fan is. Once you have that, Amazon, eBay, Mouser, or DigiKey should all have something that would work. Assuming it runs on 12V, it should be pretty easy to find a computer case fan that fits.