Exhaust fan

hi, just have a question: as soon as i open my macbook pro the exhaust fan turns on. its not loud or anything in fact the only way to hear it is to put your ear to the macbook but i just wanted to know if its normal.i have istats widget thats showing me that all temps are normal and exhaust fan running about 2000 rpm. i checked activity monitor and nothing unusual there and i also did ram and power management resets. again i just want to make sure that its normal for the fan always be on.
thanks

I recommend using the iStat Pro dashboard widget to monitor the exhaust fan speeds. The two in my i5 MBP are only audible when they reach ~4000rpm which usually happens when both physical cores are at >90%. With one core at 100% they both stay at ~3400rpm and the cpu at 71C.

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