Standard 52.1-1992 provides three important evaluation criteria:
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dust spot efficiency
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arrestance
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dust holding capacity.
Standard 52.2-1999 provides a filter’s initial efficiency as a function of particle size, as well as a numeric value that allows a user or engineer to specify a product's minimum efficiency reporting value (MERV).
Read the attached Camfil Farr overview, which fully explains the standards and how to use them. Download the PDF document.