That unit is identical to the big Harbor Freight blower, I've had one for years. I've never found it particularly noisy?
I'm curious about your setup, such as, are you going to have the blower inlet 'track' the laser head? If so, I have a little advice that probably no one will agree with
-- which is, do NOT use 6" inlet
at the source of the smoke. 4" may even be too big, but it's cheap to experiment. Me, I would run typical 4" flexible ducting suspended from above that can travel around with the gantry easily. Then I would funnel it down to 3" at the 'nozzle'. The reason is air velocity, which is what you need to draw the smoke. You'll lose some air FLOW, but not enough to hurt anything with that blower. The air will move much faster thru a 4" duct than a 6" duct, and at the nozzle the velocity will pick up even more. What this will do is draw the smoke from much farther away, as the air will be moving towards the nozzle very quickly in a narrow path, creating a very low pressure area that smoke will be drawn to. Works just like a tornado. Put a wide nozzle on, and the velocity slows down to the point the nozzle will have to be much closer to the smoke source.
I've been experimenting with this on my fiber laser. I have a 3-1/2, 4, and 5 inch nozzle tips, and the smaller I go, the farther away the nozzle can be from the work and still draw smoke. The 5" nozzle won't draw powdercoating smoke horizontally from 8" away, half the smoke just drifts up and away. But the 3-1/2" nozzle will draw the smoke easily from 12" away, and this with a 'green' HF blower AND sharing airflow with my LS900.
Could be 2-1/2" would be even better? Or maybe at that point it will start reducing the flow to the point the results diminish. I don't know, haven't got that far yet!
And a side benefit from choking air flow to increase the velocity-- the blower will have less work to do, and will use less electricity...