Warren Spring & Other Wind Tunnel Test Reports

It became internationally famous in the 1980's when the U.S. EPA contracted aerosol researchers to resolve a touchy debate over PM10 ambient Inlet performance at various wind speeds and aerosols. Their work resulted in the famous "Warren Spring Hi-Vol PM10 Inlet Report" the official title of which is: "Wind Tunnel Measurements of the Collection Efficiency of Two PM10 Samplers: The Sierra-Andersen Model 321A Hi Volume Sampler and the EPA Prototype Dichotomous Sampler. Report No. LR 669 (PA)H”. This exhaustive wind tunnel aerosol test work has long been held up as an icon, even though the methodology did not exactly conform to the 40 CFR Part 53, Subpart D, EPA Standards for designating and testing an ambient particulate inlet and fractionator.

This report has been "lost" for some years, but, recently, with the realization that there are no longer wind tunnels, anywhere in the world, verified for Subpart D testing, two of the original investigators endeavored to render this and other crumbling reports available as electronic files, before they are lost forever.