It is counterintuitive, but HEPA filter efficiency increases with smaller particles. https://bofainternational.com/en/our-technology/filter-technology/how-hepa-

It is counterintuitive, but HEPA filter efficiency increases with smaller particles. https://bofainternational.com/en/our-technology/filter-technology/how-hepa-filters-work/ https://bofainternational.com/en/our-technology/filter-techn...