IEST RP-CC001.6

This Recommended Practice (RP) covers basic provisions for HEPA and ULPA filters as a basis for agreement between customers and suppliers. The RP describes 11 levels of filter performance and five grades of filter construction. Filters that meet the requirements of this RP are suitable for use in clean air devices and cleanrooms that fall within the scope of ISO 14644 and for use in supply air and contaminated exhaust systems that require extremely high filter efficiency (99.97% or higher) for submicrometer (µm) particles. Supersedes previous editions of IEST-RP-CC001.