7 Filters that meet the requirements of IEST-RP-CC001 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. IEST-RP-CC001 describes 11 levels of filter performance and six grades of filter construction. The level of performance and grade of construction required should be specified. The filter efficiency required should also be specified if it is not covered by the performance level specified in this RP (Table 3). Testing Capabilities of AAF Flanders All HEPA and ULPA filters produced by AAF Flanders are built in an ISO 7 cleanroom environment and tested in an ISO 4 cleanroom with full compliance to IEST standards. In a modern test rig, each air filter is individually tested by well-trained AAF Flanders personnel before shipment to the customer. HEPA and ULPA filters are leak tested using a challenge aerosol. The test results are documented in a test report for each individual HEPA or ULPA filter. This report gives full information about the tested air filter, test parameters (airflow, test method and aerosol), and the test results according to IEST-RPCC001, and are available for every filter when requested. Air filter labels include the identification of the air filter type, a serial number for full traceability, the test standard used, the filter class, and the nominal airflow rate at which the air filter has been classified. Strict quality procedures ensure that all HEPA and ULPA filters leaving the AAF Flanders factory are leak-free, perform according to applicable standards, and are consistent with the individual customer requirements. Air Filter Classification According to IEST-RP-CC001 Table 3: Recommended Test and Minimum Rating for Filters Types A Through K. Filter Penetration Test Last (Scan) Test1 Minimum Designated Type Efficiency Leak Method Aerosol Method Aerosol Comments Rating Penetration HEPA MIL-STD-282 Thermal DOP None None 99.97% n/a (type A) HEPA MIL-STD-282 Thermal DOP None None Two-flow 99.97% n/a (type B) leak test HEPA MIL-STD-282 Thermal DOP Photometer Polydisperse 99.99% 0.010% (type C)1 DOP/PAO HEPA MIL-STD-282 Thermal DOP Photometer Polydisperse 99.999% 0.0050% (type D)1 DOP/PAO HEPA MIL-STD-282 Thermal DOP None None Two-flow 99.97% n/a (type E)1 HEPA IEST-RP-CC007 Open Particle Open 99.9995% at 0.00250% (type F)1 Counter 0.1-0.2 or 0.2-0.3 µm HEPA IEST-RP-CC0072 Open Particle Open 99.9999% at 0.0010% (type G)1 Counter 0.1-0.2 or 0.2-0.3 µm HEPA IEST-RP-CC007 Open None None 99.97% at n/a (type H)1 0.1-0.2 or 0.2-0.3 µm HEPA IEST-RP-CC007 Open None Open Two-flow 99.97% at n/a (type I)1 leak test 0.1-0.2 or 0.2-0.3 µm HEPA IEST-RP-CC007 Open Particle Polydisperse 99.99% at 0.010% (type J)1 Counter or DOP/PAO 0.1-0.2 or Photometer 0.2-0.3 µm HEPA IEST-RP-CC007 Open Particle Polydisperse 99.995% at 0.0080% (type K)1 Counter DOP/PAO 0.1-0.2 or Photometer 0.2-0.3 µm 1 Either of the two scan test methods or an alternative method may be used for filter types C, D, F, and agreed. Designated leak details for these filter types are given in IEST-RP-CC034. 2 Filter medium tested at most-penetrating particle size (MPPS) prior to filter assembly. All filters are leak-tested but in some instances may not be tested for overall penetration. The MPPS for testing this filter type is determined from the media according to IEST-RP-CC021.
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