There are a lot of great options in the quiet case fan market today. Numerous computer companies make a quiet case fan. In our experience, Nexus quiet case fans are the quietest case fans available and are also affordable and reliable. Papst is the original quiet case fan company and still makes truly silent case fans. Also, Noctua produces a high-quality, truly-silent case fan with unique features, although these case fans tend to be a bit more pricey. Noctua case fans are available through our Amazon store.