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