This filter eliminates bacteria, viruses - including bacteria and viruses like SARS-CoV-2, the virus that leads to COVID-19 - and combustion particles from automobiles and smoke, through a nano-fiber structure. Media consists of non-woven glass microfiber, mini-pleated for high-capacity, non-off gassing separators. Average filter life: 4 years and 2 months (based on average daily usage of 10hr/day on speed 3)