[Laos101]

careful with your voltage and amperage. the device will suck i think 3.7v or so and roughly 300 mah. dont want to undervoltage your device. also if the fan is under voltage then the process willl be underefficient.

If I were you. get a cheap adapter and use a stronger fan(s) and you will have better efficiency. of course this will take away portability. but you can always use batteries if this is an issue.

or perhaps a second usb cable?