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This International Organization for Standardization (ISO) 16890 “Understanding ePM and ISO Coarse” User Guide was created by the National Air Filtration Association (NAFA) Foundation, a NAFA nonprofit organization. NAFA is an international group of air filter distributors, manufacturers and engineers. This guide and the application of the particulate contamination removal standard ISO 16890 “Air filters for general ventilation” are intended to assist end-users and specifiers in their selection of appropriate air filtration products and understanding the ePM values in the 16890 test reporting. This guide also aims to help users understand the similarities and differences between this test and ASHRAE 52.2 and its MERV.