Mini PC Lid Vent - RX6400 RX6500 - Lenovo Dell HP SFF - M720q M710q M920q etc...

Use tin Snips to cut out the top of the lid and glue the overhang.

I found a significant drop in CPU/GPU temp with the lid off vs on, having this vent should get the required result.

The version you need for the Lenovo Mini is: 155x140
 

I used the holes but made a flat vent, this way you can retain the original fit of the metal case