In all of the videos showing the Glowforge in action I don’t remember any showing the Air Assist port. (Might be wrong). Air exists the rectangular vent behind the head and shoots rapidly toward the front of the machine. Smoke circulation is such that it completely avoids the head area and exits the left rear of the unit.
This material test uses less than 40% of the current maximum score speed. Settings will continue to evolve as the S/W changes. I used a little $50 Polaroid Cube camera for the video.