There are many air sanitization units that use HEPA filters. HEPA filters capture pathogens rather than kill them. HEPA filters are not cost-effective as one unit can include multiple filters that require frequent replacement. This is not a practical solution for facilities if there are many units installed within the facility. The removal of dirty HEPA filters from the units may spread contaminants throughout the rooms as the pathogens are still active and able to disperse back into the air.