Electrets and filtration: Lab testing and field performance head to head

Kimberly-Clark Corp's David Meyers and B. Dean Arnold address several testing procedures - ASHRAE 52.1 and 52.2 - and investigate the oft-quoted criticism that the exposure of electrostatic filtration media to 'real world' air results in a filtration performance below the efficiency determined by the ASHRAE 52.2 test.