It’s more about pressure than airflow. You just need negative pressure inside the chamber, so gas escapes into your chamber through the cracks, and out the vent.

Saudis were happy to bankroll it to kill the main organisation platform behind the Arab Spring uprisings

I use a 15 year old, quarter million dollar 3d scanner at work. It’s on par with what you can get for about 5 to 8k these days.