This is the HyperHEPA filter for the HealthPro Series air purifiers. The IQAir HyperHEPA filter (F3) traps fine and ultra-fine particles, including bacteria and viruses like SARS-CoV-2, the virus that leads to COVID-19. Media consists of non-woven microfiber, mini-pleated for high-capacity, non-off gassing separators. Filter efficiency: ≥ 99.97% at ≥ 0.003 microns (EN 1822 class H12/13) Surface area: 53 sq.ft. (5.0 m²)***. Average filter life: 4 years and 2 months (based on average daily usage of 10hr/day on speed 3)****