CDC recommends a layered strategy to reduce exposures to COVID-19. Consider ventilation system upgrades or improvements and other steps to increase the delivery of clean air and dilute potential contaminants. While the list of tools is intended to be universally applicable across indoor environments, applying them to different building types, occupancies, and activities under environmental and seasonal changes can be challenging. The specific combination of tools chosen for use at any point in time can change. It will be up to the building owner/operator (obtaining expert consultation as needed) to identify which tools are appropriate for each building throughout the year. In addition to ventilation, the layered approach includes efforts to improve social distancing, wearing face masks and hand hygiene.
Read more about CDC Guidance Ventilation in Buildings.