^ it's just an example.
There are many laptop cooling pads available on the market. look around I guess.
if you want to wire your 12v fan from usb, it's also possible to use 2 usb to make it 10V. but u need to modify the wire. however, if u r not even sure about the usb combine cable makes 5V 1A, then I wouldn't show you how.
get a usb fan would be easier.