Air Assist for Laser Cutter V2

In addition to my first version of an Air Assist, here is a improved version.

with my first nozzle the Air came from one direction and when i cut in the opposite direction of the Airflow there was again visible fume.

with the new design, there are three nozzles.
the airflow meet about 4mm above the cutting surface and blow as one prependicular onto the cutting area. Air Assist was designed for a 2" Lens. I think 2,5" will also work, but 1,5" I think the it is to big. When i get my Lens-Ki