I need some quiet fans that would have enough airflow for the S5.
Nice play on words for your title 
I was expecting a fanboy thread XDLikewise... however on topic, reducing the airflow with a quieter fan, you may end up only fanning the flames.
If anything perhaps bitmain could suggest a mod for two quieter fans to replace the stock single fan which would surely increase heat dissipation across the entire miner.