Heres a picture of mine, it's a small 25x25mm Laptop fan (plugs into 4th reciever channel). It blows air onto the ESC and has a switch near the transmission, so I can have it on when it gets hot rather than just on all the time. :)
That looks like a winner - Thats basically the same as Mike and I have on ours - cept we keep ours on all the time - cause ya never know when some nitro knucklehead needs a good reality check. You wanna race out Emaxx with a nitro