Is primebook does not having FAN?

Using primebook while charging it give system temperature warning and screen brightness automatically down.

But it work perfectly while i am using in library where ac is there.

Currently, the temperature in many parts of India is quite high, which can cause Primebook to heat up during use. To protect the system, Primebook automatically lowers the screen brightness when the temperature rises. Using it in a cooler environment, like an air conditioned library, helps maintain normal performance.