I don't think there is a fan for the profilers, and probably for the reason that you don't need one. The anti-fog coating isn't bad on the lens, gets a bit pants after a lot of wear and washing/wiping but a decent anti-fog spray will help give a bit more longevity to the lens.
Something I find helps is some kind of headband or hat to soak up the majority of the sweat from my forehead which saves it going in to the foam and adding any moisture that could cause misting. If you are having problems, buy a new lens and anti fog stuff.