Is it normal for BH550 to behave like this?

Is it normal for BH550 to behave like this?

My new BH550 arrived today. When I power on the amp, the cooling fan runs (very loudly) at full speed for about 20 seconds or so and stops. After that, the fan doesn’t start again.

So is this a normal behavior?

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Source: http://forum.tcelectronic.com