AMCA COVID-19 Guidance for LargeDiameter Ceiling Fans Over a 12-month period, Air Movement and Control Association, in collaboration with an international team of scientists, engineers, and researchers, executed a series of numerical simulations to investigate the impact of large-diameter ceiling fans on COVID-19 exposure in a warehouse. 2 Photograph courtesy of Greenheck Fan Corp. 2021 AMCA inmot ion www.amca.orghttp://www.amca.org