How many degrees of cpu, the fan start to increase rpm?

Hi guys, i have a mac mini late 2012 i5 processor. The fan is constant about 1800 rpm also when the mac is hot.
So, i am worried. How many degrees of cpu, the fan start to increase rpm?
There is a method to know if the fan working?

I have been using > http://www.crystalidea.com/macs-fan-control on my 2010 Mac Mini for several years. I use the Sensor-base algorithm to control the CPU/GPU temp's. With a lower setting of 148F (64.5C) and an upper setting of 194F (90C), the exhaust fan speed slowing ramps up from 1800rpm to around 2200rpm and the Mac Mini never goes over 160F (71C) even under a heavy load.
I don't worry about damaging the fan using only slightly elevated speeds, besides the fan in the Mac Mini is cheap and easy to replace compared to a logic board. One thing to be aware of when using any fan control-ware is the risk of greater dust accumulation. Base on that and the fact that it is dusty here in the late summer and fall, I open, check and clean inside my Mac Mini a couple of times a year.

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I have a new Macbook pro, about 2 months old, and at times running video, the fans starts and does not stop. how do you get it to stop.

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Your fan(s) will run at high speed (i.e., loudly) while video is playing, and you can't get around that.
If your fans are not slowing down within 2-4 minutes after CPU- and/or GPU-intensive usage ends, and the application that was showing the video is still running, Quit that application. (In fact, if you're accustomed to Windows, you may not realize that simply closing a Mac application's window does not quit the application. You still need to use the Quit command in the application-name menu. There will always be a bright dot beside or below the application icon in your Dock for each application that is open.) Quit the ones you aren't using, and see whether that allows the fans to slow down without restarting the machine. If that doesn't do the trick, reset the SMC:
http://support.apple.com/kb/HT3964?viewlocale=en_US&locale=en_US

I have a new Macbook Air and for the last few days the fan had run continuously, this is the first time it has ever run, and now it won't stop, the fan starts up as soon as I turn it on. The computer is not hot.Any ideas on how I can fix this please ?

I have a new Macbook Air, 6 months old, and for the last few days the fan had run continuously, this is the first time it has ever run, and now it won't stop, the fan starts up as soon as I turn it on and the computer seems to running more slowy.The computer is not hot but I am worried it may burn out,.Any ideas on how I can fix this please ?

Hello dwb,
Here is the screen shot, just the top half, there are another 10 pages, but I guess this should enough for you to have an idea of waht is going on, bit small I am afraid. No, I don't have any apps setup to run when I open my computer, the kernel, varies between 290 and 305 per cent ish.
Would that PRAM thing help ? I think it may be the computer itself, well something inside, as this the first time that the fan has ever started running since I have this computer, even when I have 3 or 4 apps running.
Thank you again for your advice,
Regard,
Beauty of Bath

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