1. ASHRAE 52.2-2007

2. 2010 Round Robin

3. 2011 Round Robin

4. Issues under Review by Task Groups Current MERV boundaries Humidity Range OPC particle counter specifications Air density calculation Shedding IPA vapor conditioning Test variability

5. Reported Values Channel E1E2E3 Reporting Value Particle Size Range.3 to 11 to 33 to 10 Filter 1 37%65%84%MERV 8 Filter 2 36%65%85%MERV 11

13. Issues under Review by Task Groups Current MERV boundaries Humidity Range OPC particle counter specifications Air density calculation Shedding IPA vapor conditioning Test variability

14. Fig. 8 ASHRAE 1287 RP

15. KCL @ 0% to 85% RH

16. Other Potential Issues Test dust Specifications for particle generator Radioactive versus corona discharge in neutralization of airstream Initial resistance calibration