IEST updates filtration recommended practices
Two revised Recommended Practices (RPs) covering high-efficiency particulate air (HEPA) filters and ultra low penetration air (ULPA) filters are now available from the US Institute of Environmental Sciences and Technology (IEST) in Arlington Heights, IL.
IEST-RP-CC001.5: HEPA and ULPA Filters describes 11 levels of filter performance and six 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 Cleanrooms and associated controlled environments. They are also suitable for use in supply air and contaminated exhaust systems that require very high filter efficiency (99.97% or higher) for sub-micrometer (µm) particles. An expanded filter selection guide includes applications in the medical/pharmaceutical, nuclear, microelectronics, aerospace, and paint booth industries.
IEST-RP-CC034.3: HEPA and ULPA Filter Leak Tests covers equipment and procedures for leak testing filters in the factory, on site before installation, and after installation in cleanrooms and in unidirectional-flow, clean-air devices. This RP also includes methods for measuring the uniformity of the aerosol challenge approaching the filter under test. New to this edition is an appendix that provides guidance for choosing the conditions for conducting a filter leak test with an aerosol photometer as the filter is installed in the field.
These and other IEST filtration RPs may be used to define the basis of an agreement between customers and suppliers.
Also available is the IEST Handbook on Air Filtration, a collection of RPs that address filter and filter media testing, construction, performance specification, selection and application to achieve the certifiable contamination control level.
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