How I Test
Here is exactly how a number on this site gets made, on my own bench, not copied from a manufacturer's spec sheet, plus where the honest limits of that testing are.
The equipment
| Instrument | What it measures |
|---|---|
| Anemometer | Air velocity at the tool port, converted to real delivered CFM |
| Manometer | Static pressure through the actual duct run, not the collector alone |
| Laser particle counter | Fine dust concentration before and after a cut, the part a spec sheet never shows |
| Decibel meter | Noise at 8 feet, a fixed distance used for every unit |
| Scale | Captured mass in the separator and filter, for a standardized dust load |
The protocol
- Fix the tool-side setup. The same hood, port adapter, duct route, and hose length are used for every collector in a given comparison, so the collector is the only thing that changes.
- Measure airflow at the tool, not at the collector's inlet. A manufacturer's rated CFM is measured with no ductwork attached at all, which is not how anyone actually runs a dust collector.
- Measure static pressure through the real duct run, and record it alongside the CFM figure, since the two only mean something together.
- Run a standardized dust load, the same material and quantity every time, and weigh what gets captured in the separator versus what reaches the filter.
- Measure fine dust before and after with the particle counter, at a fixed distance from the tool, to see what a collector actually keeps out of the air you breathe.
- Measure noise at 8 feet, the same distance every time.
- Track filter loading over time. A collector that performs well on day one and badly after a month of use is not a good collector, so units get re-checked, not tested once and forgotten.
- Publish the raw numbers, not just a rating, so you can weigh them against what matters to you.
Where this falls short of a real lab
This is one shop, one tester, and consumer-grade instruments, not an accredited laboratory. Results are repeatable within this bench and this protocol, and they are far more grounded than a spec sheet, but they are not a substitute for an industrial hygiene assessment if fine dust exposure is a serious health concern in your specific shop. Where that matters, this site says so directly rather than overstating what a home bench test can prove.
Independence
Units are purchased at retail whenever possible. When a manufacturer sends a review unit, that is disclosed on the page, and it does not change the protocol or the verdict. See the editorial policy for the full detail.