TABLE 3

Centers for Disease Control and Prevention Guidelines for Environmental Infection Control in Healthcare Facilities – airborne-contaminant table

Air exchange per hour (ACH)Time (min) required for removal of 99% of airborne contaminantsTime (min) required for removal of 99.9% of airborne contaminants
2138207
469104
64669
83552
102841
122335
151828
201421
5068

Time to remove aerosol particles based on air exchange rate per hour (Airborne-contaminant removal Table).