XGS87W Fan noise - Console Commands and fan change possible?

Hi,

i have installed a XGS87W by my mother. It was my first Desktop Series. Normaly i install only DE and EE. I did not expect that the smallest desktop edition using a fan.

The XGS is installed in the living room by my mother, because there is the DSL Router. 

Is there a console command to reduce the fan speed? Is it possible to change the fan? (Without loosing guarantee?) Maybe Noctua?

Thanks for help.