I did the A14 and scythe "kraze" with an underclocked s7 last winter fairly quiet. Looking at spec again two A14's should provide more CFM's and lower db's. Will need adapters though.
https://noctua.at/en/products/fan/industrial
https://www.amazon.com/gp/product/B001JKNMBE/ref=oh_aui_detailpage_o06_s00?ie=UTF8&psc=1