I wanted to upgrade my stock part cooling fan to a pair of noctua 40mm fans and when I did a test run they barely push any air through the ducts compared
Quiet 12V NOCTUA Fan on 24V Creality Ender 3 - YouTube
Noctua Nf A12x25 Black | Noctua Cooling Fans | Noctua Fan 40x40x20 | Noctua 50x10mm Fan - Case Fans - Aliexpress
Best 3D Printer Fan - Noctua NF-A4x10 FLX and Noctua NF-A4x20 FLX - YouTube