ASTM_F_1471_-_09.pdf

Designation:F147109Standard Test Method forAir Cleaning Performance of a High-Efficiency ParticulateAir Filter System1This standard is issued under the fixed designation F1471;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the procedure and equipmentfor measuring the penetration of test particles through high-efficiency particulate air(HEPA)filter systems using a laseraerosol spectrometer(LAS).This test method provides thecapability of evaluating the overall effectiveness of HEPAfiltersystems consisting of one or two filter stages.1.2 The aerosols used for testing have a heterodisperse sizedistribution in the submicrometer diameter range from 0.1 to1.0 m.1.3 The purpose for conducting in-place filter testing by thistest method is in the ability to determine penetration ofmulti-stage installations,without individual stage tests.Particlepenetration as low as 108can be measured by this test method.Also,the LAS provides a measure of penetration for discreteparticle sizes.1.4 Maximum penetration for an installed HEPA filtersystem is 5 104for one filter stage,and 2.5 107for twostages in series is recommended.NOTE1Acceptance penetration criteria must be specified in theprogram,or owners specifications.The penetration criteria suggested inthis test method is referenced in Ref(1).21.5 The values stated in SI units are to be regarded as thestandard.1.6 This standard does not purport to address all of thesafety problems,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.Specific precau-tionary statements are given in 9.6.2.Referenced Documents2.1 ASTM Standards:3F328 Practice for Calibration of an Airborne Particle Coun-ter Using Monodisperse Spherical Particles(Withdrawn2007)42.2 Military Standard:MIL-STD 282 Military Standard Filter Units,ProtectiveClothing,Gas Mask Components,and Related Products:Performance Test Method53.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 dilutera device used to reduce the aerosol particleconcentration to eliminate coincidence counting is in the LAS.3.1.2 dilution ratiothe ratio of the undiluted aerosol par-ticle concentration entering the diluter to the diluted portion ofthe particle concentration.Because diluters have inherentparticle losses that may vary according to the particle size,thedilution ratio may not be constant with respect to size.3.1.3 laser aerosol spectrometer(LAS)a precision particledetector that allows single particle counting and sizing by theamount of scattered light from individual particles,where thesignals can be grouped into categories corresponding to par-ticle size.3.1.4 penetrationthe number of particles passing throughthe filter stage,to the number of particles challenging theupstream side of the filter stage.The penetration,or thechallenge aerosol,may be associated for each particle size ofinterest.1This test method is under the jurisdiction of ASTM Committee D22 on AirQuality and is the direct responsibility of Subcommittee D22.05 on Indoor Air.Current edition approved March 1,2009.Published March 2009.Originallyapproved in 1993.Last previous edition approved in 2001 as F1471-93(2001).DOI:10.1520/F1471-09.2The boldface numbers in parentheses refer to a list of references at the end ofthis standard.3For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.4The last approved version of this historical standard is referenced onwww.astm.org.5Available from Standardization Documents Order Desk,DODSSP,Bldg.4,SectionD,700RobbinsAve.,Philadelphia,PA19111-5098,http:/www.dodssp.daps.mil.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.Summary of Test Method4.1 A challenge aerosol produced by Di(2-Ethylhexyl)Se-bacate(DOS),Di(2-Ethylhexyl)Phthalate(DOP),or Poly-Alpha Olefin(PAO)is injected upstream of the filter systemand allowed to mix with the airstream.Using a LAS,samplesof the aerosol are collected from the airstream through probes,both upstream and downstream of the filter system.With thistest method,the penetration of the filter system can becalculated either as a function of particle size,or in a particularsize of interest.Due to high particle concentrations that may berequired to evaluate the performance of HEPA filter systems,itmay become necessary to dilute the upstream sample to avoiderrors due to coincidence counting by the LAS.4.2 If a diluter is required,the dilute