@ssdnvv Noctua is mainly known as an expensive but very good quality cooling stuff company.
I bought a Noctua NF-A4x10 5V PWM and a Noctua NA-FC1. The first one is a tiny USB fan and the second object is a controller I use to set the fan speed as low as possible so I can’t hear it. You don’t need it if you don’t mind the noise. You may not need it too if you have electrical knowledge to plug the fan directly to the Mox.
Two pictures of the installation :
As you can see the fan is in the Mox case to extract the hot air from the A module (+ PoE). It fits perfectly.
The fan is connected to the controller then to a USB port from the module F behind the Mox.
I need to change few things to hide the screws and re-print few parts with a better configuration to make the whole prettier.
I must say it works as expected : inside temperature is now bellow 60°C while fully charged (USB transfer, Wifi, ethernet, etc).
So : a hole plus a fan and things are fixed !