Children's Hospital Colorado

Exam Room Turnover Guidance

Our epidemiology team has developed the following guidance on the use of HEPA filters and room turnover rates for healthcare providers to use in their practice.

  • Air purifiers that supply 330 cubic feet/minute of air are more than enough for decontamination. Choose a H13/True HEPA/HEPA filter for each unit. For the COVID-19 virus and associated aerosolized droplets that carry the virus, you need HEPA filtration.
  • Air changes per hour (ACH) = filtration rate in cubic feet minute (CFM) X 60 minutes/volume of the room (cubic feet)
  • ACH = 330 CFM X 60 Minutes/800 CF = 25 ACH
  • Look up 25 or other ACH number in table B.1. in Appendix B of the CDC’s Guidelines for Environmental Infection Control in Healthcare Facilities to get the turnover time. At Children's Hospital Colorado, we use the time required to remove 99% of airborne contaminants.
  • The placement of the HEPA air purifiers is important. Place the HEPA air purifier as close as possible to the center of the room. Also, place the HEPA air purifier about 3 to 4 feet above the floor. This will ensure better coverage of the air in the room.

If you have any questions regarding this exam room turnover guidance, please email Chad Gillham.