Aerosol is a gaseous dispersion system composed of solid or liquid particles suspended in a gaseous medium. The aerosols are mainly from clouds, fog, dust,
cooking fumes, fumes exhausted from industrial or commercial boilers, vehicle exhaust, road dust, solid dust from grain processing, and toxic smoke from other
situations and bacterial activity, etc. Our negative pressure protective system can filter the aerosols starting from 0um and the particles above 0.3um, which
can meet the requirements of aerosol filtration with COVID-19. And the system achieves 12 times per hour air filtration, which makes the aerosol purification
efficiency 99.9991% and protect the medical staff very well.