My macbook air has a strange noise

My macbook air has been making a noise sometimes. I upload a video so you can listen
http://www.youtube.com/watch?v=Wum4vd7Aimo&feature=plcp
I dont think it is the fan, it doesn't sound like that... anyway, it is at 1997 RPM right now and there is this disturbing noise.
Thanks you in advance!

They are the fans. Reset the SMC > http://support.apple.com/kb/HT3964?viewlocale=en_US

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