Powerunit noise

Just received my Snapmaker 2 150. The power unit is VERY noisy. There must be a ventilator inside, that certainly not is the silent type!
What can I do about this problem – change ventilator?

One of my first Prints / Modifikations was a new Backplate for the PSU with new Fan.
Find some Templates at

In log Term: I am designing a Cabinet for my A250 (with Option to extend to a A350) with a 20x20cm compartment where i Place the PSU with 2 80mm Fans and Airguides and Display and Switch in the Front.