I dont see a need for a fan. You could take that money and put it towards a nicer thermal mask. I have the Vents Cylus with 2 lenses. The stock lens rarely fogged, and when it did it was just a tiny bit around the nose. I bought a blue tinted lens a bit later... it doesnt fog at all, and I have played in every weather condition imaginable for PA. rain, snow, cold heat, humidity. Works like a charm, and I breathe hard too.
