Company produces filters. To test their filters, at timed intervals dust is dispersed into the air. They measure diminishing flows and how long it takes the filters to clog up. Most methods they tried, unevenly dispersed the dust thus not providing good test results. Injecting small amounts of dust into the suction end of a Model 120020 3/4" (19mm) Super Air Amplifier the high velocity high volume of air flow provided a homogenous cloud of dust that evenly covered the test filter elements providing more accurate test data.