This small 6cm fan behaves as just like its bigger brothers, and does its work silently.
Included are as always with Noctua extension cable, using various accompanied and not only to reach help more distant ports:
Noctua provides small plug with with resistors to the speed permanently to reduce so that one - when the cooling in the appropriate case, sufficient - even quieter than can cool quiet.
Conclusion: Perfect product, easy to install and efficient and quiet as promised!