Wind tunnel testing is required by USEPA for evaluating Particulate Matter samplers. In the past, most wind tunnel studies employed mono-dispersed aerosols as test particulate matter. Compared to the mono-dispersed aerosols, using poly-dispersed particles have two primary advantages: (1) better simulation of the performance of samplers in the real world and (2) significantly reduced experimental time and cost. A new wind tunnel testing protocol has been developed to use poly-dispersed particles. This paper will discuss dispersion of the test particulate matter, sampler/filter quality assurance, sample analysis, and data processing. The sampling protocol was employed to test SA241 PM10 and a Low-Vol TSP inlets (top half of SA241 inlet without the impaction plate and water excluder sections). Initial results of sampler cut point and slope will be presented.