My fans have been at 6200rpm several times. Yesterday while rendering a bit of video while I sat in a coffee shop, I was surprised to see them at 6200 because with just the low ambient noise of a nearly empty shop I couldn't hear them at all. Even in a quiet room they are not intrusive at full throttle. And picking up my MBP, they surely aren't as bothersome during normal operation as the constant HDD accessing noises a normal laptop makes. At 2500 rpm, I have to put my ear to the exhaust vents to hear the fan run, where I can clearly hear my dual fans at 2000 rpm on my MBP from 3 feet away. Also, when they are running full blast my CPU temp is running 78 to 81c, but that is the only elevated temperature and the computer is not hot. I've enclosed my MBA in a Macally leather skin which while vented in the proper locations will reduce radiant cooling. Of course no one can see my glowing Apple logo in public, but that's ok.🙄