@s0 I have the same server, and even when the fan is not noisy (you have more than one fan?), I've been searching because it's really hot where I live.
Are these the ones you are thinking about? https://www.sunon.com/en/News.aspx?c=p&id=23819B06E55ACAEA
Has anyone done a fan replacement for an older home server? Wondering if replacing the 10-year-old fans in my HP gen8 might make it quieter or if I should chase up other options like retrofitting a different model from Sunon or similar.