Background: the fans should replace the unpleasant whirring fan my Zyxel NSA 325. In various forums of XILENCE XPF60 is recommended. That's why I ordered this company via Amazon at let's. But unfortunately not the original fan was supplied, but an identical NoName model. This is not quieter as the Zyxel part, but did not growl so deep an unpleasant, which is why I have not sent it back.
Meanwhile, I have but to get from a dealer "around the corner" a Xilence which really quiet (almost inaudible) is.
Product is functionally useful, but since not described and not quietly only 3 stars.