PM2.5 Loading Characteristics of Commercial Indoor Electret HVAC Filter Media

摘要

Particulate matter, PM, a major component of outdoor air pollution, was classified by International Agency for Research on Cancer of World Health Organization as carcinogenic to humans in 2013. PM2.5 contributes the essential toxicity of ambient PM, which can easily infiltrate into indoor environment from outdoor. China and its surrounding countries are frequently hit by high PM2.5 pollutions. Filtration techniques such as central HVAC systems are more and more widely applied to mitigate the human exposure. In these equipment, electret filter media are used but the existing test standard, ASHRAE 52.2-2012, only challenges the filter with particles larger than 300 nm. Therefore it's urgent to challenge these electret media with PM2.5 and nanoparticles to get a more accurate performance of these media against the existing smaller indoor particles.