The fan must work hard mirroring from MBA to ATV and the computer gets very hot, solution?

I bought an Apple TV (3) for watching web tv by mirroring the screen. The picture is good but the computer gets hot, very hot. The fan on the computer is working hard and the sound of the fan interferes my TV watching. Is it normal that the fan is running as much as it does? It starts just after 3-5 minutes. Is there any solution?
My computer is a Macbook Air 13" i5 (mid 2012)

Hi Rudegar
I found this to be an interesting post... so...
I just ran a 13 min Youtube video from my Macbook Air (mid 2012) i5 on Air Play Mirroring to Apple TV3 and I didn't experience any appreciable heat nor any fan noise.
My MBA is encased in a clear Speck case, and my house temperature is about 21C (72F).
I just wonder if Hejmattias has something else going on or are we just seeing manufacturing variation?
cheers

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