He investigado un poco acerca del ruido del ventilador en los foros:
HiMedia HD900B Full 3D Media Streamer (Realtek 1186-based) - Page 12 - AVS Forum

"I'm thinking about this box solely for 3D iso playback. One thing that I'm worried is fan noise. Have you guys noticed any noise from the fan? Is it running all the time? Or it only runs when there is a HDD in the box? The HD900A form factor doesn't have a HDD cage and it doesn't appear to have a fan either.

--> I don't notice the fan at all from about 6-7ft away.

Vamos que dice que a 2 metros no lo oye.

Y en otro sitio:
iboum.com : Future Entertainment Technology : HiMedia HD900B

"How loud is the cooling fan? Can it be switched off if you don't use a hard disk inside the player?

-->Fan noise isn't an issue...