![]() ![]() They will be less valuable in settings with long-duration contacts, particularly in the absence of ventilation. Barriers are most valuable for people who have high frequency but short duration interactions with high-risk contacts. Barriers are not appropriate in all settings they are dictated by occupant activities and interactions.Barriers must be paired with good ventilation, as their actions are complementary. However, by redirecting respiratory emissions away from the breathing zone, other ventilation and air cleaning assets are given time to reduce particle concentration. Barriers do not kill or substantially remove the virus from the air.They are intended to prevent the rapid bi-directional exchange of respiratory particles that occurs when two people interact in close proximity. Physical barriers serve a specific, but limited, purpose.However, challenges in creating clear guidance around barrier design and implementation, and in studying the effect of barriers in the real world, make it difficult to assess their effectiveness. Epidemiological and experimental evidence suggests that physical barriers may decrease transmission risk. ![]()
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