I want to put this in a cold room at my home, but I don't want to have the deafening noise of 76db. I have found these fans and I seem to have trouble seeing if they would do an adequate job at cooling the rig.
https://www.aab.com.pl/product-eng-269-AAB-Cooling-Silent-Jet-Fan-12-PWM.html  -  170 m3/h  | 100 CFM
and this one
https://www.frozencpu.com/products/24861/fan-1369/Noctua_Industrial_NF-A14_140_x_25mm_PWM_Fan_-_3000_RPM_NFA14IPPC30P.html?tl=g36c435s1109&id=A69tGXEq  -  270 m3/h | 158 CFM

I can't find the CFM measurements for the stock fans.

*** JUST WANTED TO UPDATE ***

I have been mining for a month or so and I haven't had any issues with the Noctua fans, I had to get the 120mm one. Alas it was put in a relatively cool environment, maybe 68F so this could effects temps, but the chips never went past 72C.