That seems ridiculous but it is exactly the same as using a 600+ CFM dust collector to flow 25 to 80 CFM through the throat plate of your saw. They are equivalent to designing a house that needs a giant HVAC system because the owner didn't bother to seal the cracks or close the windows. Most tools have terrible dust collection design. Only the air that flows across the slot in the throat plate matters.
not how much flow your vac or dust collector can produce. THE PRESSURE DIFFERENCE ACROSS THE THROAT PLATE IS ALL THAT MATTERS. If air is flowing into the only opening then the dust simply cannot get out. In short, create a vacuum within a sealed volume that surrounds the dust coming off the blade. So, what's the trick to capturing almost all the dust with just a shop vac? Both are required essentials to maintain a healthy environment. On the other hand, most dust collection isn't effective enough to prevent dust from building up to dangerous levels unless you also use an air filtration system. An air filtration system, no matter how powerful, will not be able to maintain good air quality unless your shop is set up with effective dust collection.
The #1 takeaway from this test is that it is essential to capture as much dust as possible at the source rather than to try to filter it from the air after it escapes. Without effective dust collection at your tools, even the best air filtration system will not maintain healthy air quality. The Shop Hacks Ultimate DIY Air Filtration System required only 15 minutes to clear the air after the initial cuts, with no more cuts being made. Without dust collection or air filtration, the dust concentration remained in the unhealthy range for over 5 hours even after just one set of cuts were made. A $500 Powermatic PM1200 air cleaner took 41 minutes to bring the air quality back into the "good" range.
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