![]() ![]() The science and industry teams for AMCA’s LDCF research.įollowing is a high-level summary of the project’s findings and resultant guidance. Because COVID-19 infection rates are poorly understood and varying with mutations, the study focused on particle concentrations as an indicator of exposure risk. Consisting of representatives of AMCA member companies and members of the AMCA staff, the industry team provided expertise in the application and performance of products, while the science team, made up of authorities in infectious diseases, indoor-air quality, fans, and computer modeling, including two leading members of the ASHRAE Epidemic Task Force, advised on the project setup and reviewed the intermediate and final results. ![]() To promote integrity in the design and execution of the research and ensure the conclusions drawn from the study are valid, AMCA assembled “industry” and “science” teams ( Table 1). The results, however, also are applicable to many manufacturing/industrial facilities. The focus of the studies was warehouses in the United States, in which LDCF commonly are used for comfort cooling and destratification. To contribute to and improve the body of COVID-19-prompted guidance for the operation of circulating fans, Air Movement and Control Association (AMCA) International commissioned numerical-simulation studies of airborne-particle and aerosol transmission with large-diameter (greater than 2.1 m ) ceiling fans (LDCF). 1,2,3,4,5,6 Relatively few, however, are focused on aerosol transmission of airborne pathogens in large industrial spaces, a shortage all the more noticeable during the coronavirus disease 2019 (COVID-19) pandemic. Numerous studies of airflow and performance characteristics of circulating fans have been undertaken.
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