CENTRAL HVAC FILTRATION VS. PORTABLE AIR PURIFIER FILTRATION: MITIGATING COVID-19 IN PUBLIC SPACES
CENTRAL HVAC FILTRATION VS. PORTABLE AIR PURIFIER FILTRATION: MITIGATING COVID-19 IN PUBLIC SPACES
EPA has stated, “Consider using portable air cleaners to supplement increased HVAC system ventilation and filtration, especially in areas where adequate ventilation is difficult to achieve.” One CDC example concluded that “adding the portable HEPA unit increased the effective ventilation rate and improved room air mixing, resulting in an 80% reduction in time for the room to be cleared of potentially infectious airborne particles.” Another study for a reception setting showed “high-volume HEPA filtering decreases [the individual risk of infection] by a factor of ten.”
Full article: Central HVAC Filtration vs. Portable Air Purifier Filtration: Mitigating COVID-19 in Public Spaces | ashrae.org