Guys I read online that Noctua fans are so freaking silent, so I think why isn't anyone running a asic miner from bitmain with DIY fan like Noctua fan?
I have problem with noise Bitmain miner that was repurchase from a friend, the noise is too much for me so I think there should be a Noctua fan that can work for Bitmain s19? Maybe?
As Phil said - no. The quiet fans from Noctua and other mfgrs can only move their rated airflow when there is very little back pressure eg through an uncrowded pc case.
Miners are densely packed and have a lot of internal airflow resistance meaning you need to apply fairly high pressure to move enough air through them. High pressure fans = high speed and noise.
OTH, blowers like Phil linked to deliver the needed pressure & airflow while being fairly quiet.