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Noctua Nf-b9 Redux-1600 Pwm 92x92x25mm Compute Cooling Fan 12v 3pin /4pin 90mm Pwm Quiet For Case Cooling Cpu Cooler Fan - Fans & Cooling - AliExpress
![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 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](https://preview.redd.it/iowcxp3hjsh51.jpg?auto=webp&s=3ada0ae8b6e0b5df99650b5a7fecdb2c8ed3e30e)