Quiet fan?

Whas the best quiet fan for h110i ? Thank you!

110i? I couldn't find anything on that. But assuming that you made a type and meant the 100i or 110, you could go for a pair of Noctua 120mm, or 140mm. It depends on your fan specification for the radiator. If you could clarify if its a H100i, or H110, that would help.