Well I've owned few DAP but never thought it got hot, at least to the point where I think a fan was needed. Warm, yes but needing fan, no. Don't know how hot it gets with special function but, especially with no ventilation on the hardware itself, it feels almost useless to me, at least, in my logic. I mean, there really isn't anything needing to be pulled out as it doesn't have vents
and blowing onto it, only coolsnthe surface and not the Boards themselves. Besides, majority of the time, you don't want to blow into it, you want to pull it out
As far as I can tell, Fiio DAPs don't have air vents either