Salü, in the operating instructions you should find all possible configurations or fans, fan dimensions and quantities per fan. In terms of fan quality, I can recommend the SilentWings3. But if you want to spend a little more money and want an even quieter PC, then take the Noctua NF-A12x25. Here is another video about fans: https://youtu.be/7cGdQi7Lql...