You might want to look up fans for paintball helmets. From memory, most of them run off battery, but you could probably have them to use 5v USB. http://www.amaz

You might want to look up fans for paintball helmets. From memory, most of them run off battery, but you could probably have them to use 5v USB. http://www.amazon.com/gp/aw/s/ref=is_s?k=paintball+fan http://www.amazon.com/gp/aw/s/ref=is_s?k=paintball+fan Biggest advantage being that they're specifically designed to move air down through a set of goggles.