||RTI International, Research Triangle Park, NC.; ETS, Inc., Roanoke, VA.; Environmental Protection Agency, Research Triangle Park, NC. National Risk Management Research Lab.
All tests were performed in accordance with the APCT Center Generic Verification Protocol for Baghouse Filtration Products, The protocol is based on and describes modifications to the equipment and procedures described in Verein Deutscher Ingenieure (VDI) 3926, Part 2, Testing of Filter Media for Cleanable Filters under Operational Conditions, December 1994. The VDI document is available from Beuth Verlag GmbH, 10772 Berlin, Germany. The protocol also includes requirements for quality management and QA, procedures for product selection, auditing of the test laboratories, and the test reporting format. Outlet particle concentrations from a test fabric were measured with an impactor equipped with appropriate substrates to filter and measure PM2.5 within the dust flow. Outlet particle concentrations were determined by weighing the mass increase of dust collected in each impactor filter stage and dividing by the gas volumetric flow through the impactor.