Thicker fan, better properties? Phanteks has a 30 mm fan - HWCooling.net
PSA: When ordering new, quiet fans for your printer from Noctua, please note there is a small difference between NF-A4x20 and NF-A20 ... Ooops : r/3Dprinting
Buying guide fans
Our Noctua NH-U12A cools better with one fan than with two - but why?! | PC Builder's Club
Noctua NF-F12 iPPC-2000 PWM Case Fan - Newegg.com
Noctua spent four and a half years designing its quietest, strongest fan yet | PC Gamer