The fan noise is acceptable for installation in a rack somewhere in the basement. Nevertheless, I replaced the two fans with Noctua NF-A4x10 FLX (40mm). Since then there has been peace and quiet ;-)

I think the Switch makes a lot of noise :-/

The fan noise can be quite annoying if you don't live above a club in Ibiza... ;-)
However, I recommend the Noctua NF-A4x20 FLX (40mm, 2 or 4 pieces), because they are 10mm longer than the A4x10 and can therefore push more air through.
And rather four pieces, because Digitec earns more that way...lol No: Because they can then run slower = quieter. The switch measures the temperatures of the components and controls the fans, which is easy to see.
Noctua NF-A4x20 FLX (40mm, 1x)

yes, has fan, relatively loud.

I want to replace them with noctua.
If necessary, I will also build a new cover with open fan holes.

(As I am operating this switch in the living area, it must be relatively quiet).

Two fans on the left side - but with little running noise.