I also noticed that the fan does run but in low speeds sometimes which makes it almost silent as well. I would prefer not to heat my tablet anyway but hey I can live with that as long as it's once every now and then.
UPDATE:
After some regular use I decided to put it to the test. As I stated previously I use the maximum CPU state value of 70% when on battery. So far no fan at all and running as cool as ever.
Today I opened:
Edge 3 tabs (twitter, facebook, youtube - playing a HD video)
Movies and TV app (video paused)
Settings
Task Manager + Resource Manager
And finally I opened the Google App and went to Maps and while all the above were running I was doing some intense zooming in and out multiple times and switched from maps to sattelite images and vice versa in order to recreate what made my fan go wild the last time (minus the youtube and movies and settings and task manager
)
NO FAN at all. Device warmed up just a bit but that was it. The CPU was maxing 72% then dropping then up again everytime I was zooming in and out etc. But no fan came on and device was running brilliantly .
From my experience changing the max processor state value is tottally worth it so I encourage anyone who is interested in making his device fanless to give it a try.
P.S. 70% of 2.5 gives you a max speed of 1.75 which to me it made no difference to the performance.