Latest Changes to ANSI/ASHRAE Standard 52.2: Updates & Future Outlook

1. Changes to ANSI/ASHRAE Standard 52.2. Now and What’s Coming! Michael Corbat April 4, 2014

2. Agenda • Current Approved Changes • Relative Humidity • MERV Table • Particle Counter • Shedding Calculation • Upcoming Research • Proposed Changes • Mandatory Use of Appendix J • Elimination of Intermediate Dust Loadings • IPA Vapor Discharge • Change Reporting Values

3. Relative Humidity • Previous Range 20-65% RH • ASHRAE RP-1287 Showed Major E2 and E3 Variations • New Range 45% ± 10 • Measured at filter under flow • Fully Incorporated into Standard

4. MERV Table Changes & Clarifications

5. Particle Counter Change • Resolution would require the use of Optical Particle Counter • Goal: Reduce variation • 3 Open Public Review Comments to Address • No major implication to test results

6. Shedding Calculation • Standardizes time for measuring shedding – 20 min • Downstream shall be no more than 5% greater than upstream • Will not affect most tests • One committee member opposed • Public Review Closed

7. Research • ASHRAE SSPC 52.2 has created a formal research committee • Keith Chesson, Clarcor Air Filtration is Chair • First SPC to be have its own Research Committee • Separate work for 52.2 specific from general TC 2.4 work

8. Research Project • Primary Project • Independent Round Robin • Repeat of ASHRAE RP-1088 • Will follow inclusion of all changes • Goal to determine ruggedness of test method

9. Research Project • Second Project • Independent round robin of Appendix J • Compare with IPA Vapor standard being developed by ISO • Goal – to determine repeatability and reproducibility for both methods • Awaiting completion of the formal IPA Vapor method

10. Possible Upcoming Changes – Appendix J • Appendix J was proposed to become mandatory • Has been tabled until June meeting • Would directly replace current conditioning step • Motion was amended to remove intermediate dust loadings

11. Possible Upcoming Changes – IPA Vapor • Continued pursuit of IPA Vapor Discharge • Would use protocol being developed at ISO • Reported value would be determined based on average of initial and discharge • Early data has shown this to represent Appendix J conditioning • Benefits • Speed • Cost • Repeatabily

12. Possible Upcoming Changes – Reporting Value • Elimination of MERV • Reduction of number of MERVs • More relatable to EPA PM1, PM2.5 and PM10 • E1, E2 and E3 line up very closely • Discussions on how to approach • New classification system • Simply percent at each (e.g. PM1-90%)

13. Possible Upcoming Changes – Loading Dust • Research has shown ASHRAE dust no longer reflects “real life” • ASHRAE dust does not support depth loading products • ASHRAE test dust can fall off during testing • Working with GPC-35 to determine dust for energy classification • Complicated by MERVs 1-4

14. Possible Upcoming Changes - Other • Filters tested as system – Prefilter/Final Filter • Nano Particulate Testing • Filter Shedding • ISO 16890 will likely be released mid-2015