How LEV capture hoods work

Flextraction

When applying Local Extraction Ventilation (LEV) for airborne contamination control, it is necessary to know the boundary of the capture zone of a given LEV hood under its operating conditions. By
knowing the boundary, the working zone of the task could be kept well with within the capture zone.

In this demonstration, non-toxic theatrical smoke is used to demonstrate these zones.
https://youtu.be/Vzpaz0j5GcI