REPLACED 04/01/2016 by IEST RP-CC001.6: HEPA and ULPA Filters, Includes Errata (July 2017)

This document is no longer being maintained as an IEST Recommended Practice and is for historical reference only. It may contain outdated material and has been superseded by a new version or another Recommended Practice.

IEST RP-CC001.5 covers the basic provisions for HEPA and ULPA filter units for applications requiring extremely high filter efficiency (99.97% or higher) for submicrometer particles. The RP provides performance information for 11 filter types, defines six construction grades, and includes a handy Filter Selection Guide that lists typical applications for each filter type.

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