thanks so much for the photos.
I see the label of the fan. I know well these fans, they were on my old PC.
I I replaced with queste:http://www.amazon.it/gp/product/B002KTVFTE/ref=ox_sc_act_title_2?ie=UTF8&psc=1&smid=A11IL2PNWYJU7H
only 1350 RPM
Airflow: 74CFM / 126m? / h
max decibels: 24
Now I...