The purpose of HVAC systems is to provide and maintain environmental conditions, including proper airflow, relevant humidity, heating, and cooling in a specific area to ensure thermal comfort and indoor air quality. In the context of recent threats, special attention should be paid to the built environment. People usually spend their 90% time indoor; it is essential to understand the potential transmission dynamic of COVID-19 within the building environments. The building's environment plays an important role in infection transmission. Dry indoor air was associated with higher rates of infectious and inflammatory diseases in the building occupants.
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