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the desktop fan wont do much put push dust into your laptop. i suggest buying a laptop cooler, you can get one foe 20 or 30 dollars they work really good. they sell them at alot of stores such as walmart target staple and more and you can buy online too. hope i helped. :)

the purpose of usb followers are to inspire airflow... my usb fan sits below my laptop and acts like a vaccum of the air to suck air below the laptop and makes it purely over room temperature. in any different case, my computing device reaches approximately one hundred levels