ASHRAE 52.2-2007
2010 Round Robin
2011 Round Robin
Issues under Review by Task Groups
• Current MERV boundaries• Humidity Range• OPC particle counter specifications• Air density calculation• Shedding• IPA vapor conditioning• Test variability
Reported Values
Channel E1 E2 E3 Reporting Value
Particle Size Range .3 to 1 1 to 3 3 to 10
Filter 1 37% 65% 84% MERV 8
Filter 2 36% 65% 85% MERV 11
Issues under Review by Task Groups
• Current MERV boundaries• Humidity Range• OPC particle counter specifications• Air density calculation• Shedding• IPA vapor conditioning• Test variability
Fig. 8 ASHRAE 1287 RP
KCL @ 0% to 85% RH
Other Potential Issues
• Test dust• Specifications for particle generator• Radioactive versus corona discharge in
neutralization of airstream• Initial resistance calibration
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