Top of heatsink to bottom of stacking header = 23.215mm
Top of heatsink to mounting point of stacking header = 18.855mm
Top of heatsink to bottom of module board = 17.251
Ok, but what is the overall height of an UbiSwitch + UbiSwitch Baseboard?
The whole assembly is 37mm tall with the heatsink, without the heatsink, its 23mm.
You can run the device without the heatsink if you have airflow, or if you can mount the main chip to your chassis