Last updated on November 18th, 2021 at 01:35 pm

Arlington Heights, IL, Nov. 2021 — Air Movement and Control Association International (AMCA International) released a new report on a year-long study giving Covid-19 guidance on running large diameter ceiling fans in warehouse spaces.

AMCA International, in collaboration with Concordia University, and an elite team of scientists and engineers, just released the new report: “AMCA COVID Guidance for UNDUCTED Fans – Modeling Ceiling Fans”. The goal of this study was to understand the effect of large-diameter (larger than 7ft) ceiling fans on COVID-19 exposures in warehouses (Ivanovich, Gunzner, & Arnold, 2021). The study was based on over 200 simulations conducted in a 330ft x 150ft x 28ft warehouse. Below are the major conclusions.


AMCA Report At A Glance 


  • Operating a large diameter ceiling fan (LDCF) at the highest speed in a downward direction is the most effective option to help reduce the concentration of airborne particles from loud speaking (shouting) in a sparsely populated warehouse setting (Wang, 2021). 
  • There was also a reduction in airborne particle concentration when a fan was running in the reverse direction at the highest speed in a sparsely populated warehouse setting (not as great of a reduction as in a downward direction) (Wang, 2021).  
  • Operating a ceiling fan at a slower speed will show a slight reduction in the concentration of airborne particles from speaking loudly when occupants are close to the fan, but not as much as at the highest speed and not outside the fan region (Wang, 2021).  
  • Reducing fan speeds and running in reverse could slow all airflow, thus actually increasing the concentration (Wang, 2021).


  • No matter how far the workers are from the fans (in summer months), operate fans downward at the highest appropriate speed (while still keeping people comfortable) in either direction – forward or reverse (Wang, 2021).
  • No matter how far the workers are from the fans (in winter months), operate fans downward at the highest appropriate speed (while still keeping people comfortable), OR operate the fans in reverse at the highest appropriate speed (Wang, 2021).
  • Open windows and doors in your warehouse and operate ceiling fans wherever possible (Wang, 2021).
  • Do not locate employees directly next to each other for long periods (Wang, 2021).
  • Operate ceiling fans at the highest possible rate in either direction while still keeping your employees comfortable.


Let MacroAir Help You Breathe Cleaner Air Today

MacroAir Technologies acts as a proud partner in helping to fund AMCA’s recent study. Above all, they firmly stand behind helping to create healthy, well-ventilated environments for all people. MacroAir’s HVLS ceiling fans certainly are a necessary addition to all warehouse spaces. 


About MacroAir

MacroAir invented the High Volume, Low Speed (HVLS) industrial ceiling fan. They have continued to be a leader in the market by developing the most innovative large fans in the world. They continually strive to push boundaries and set the bar when it comes to engineering and product development. MacroAir technology is based on the principle that moving air slowly is far more efficient than moving air quickly. Their HVLS fans move air down and out in all directions, keeping the air fresh and helping people and animals feel more comfortable. Comparatively, MacroAir products are unparalleled in energy efficiency and airflow. In addition, they are assembled in the USA and installed worldwide. Customers benefit from local service and highly customized solutions from MacroAir’s global distribution network.


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Ivanovich, M., Gunzner, A., & Arnold, S. (2021). AMCA COVID-19 Guidance for Large-Diameter Ceiling Fans (1-11). AMCA International. 

Wang, L. (2021, October 26). AMCA COVID-19 Guidance for Large-Diameter Ceiling Fans. Cube: AMCA covid-19 guidance for large-diameter ceiling fans. Retrieved November 8, 2021, from https://users.encs.concordia.ca/~leonwang/moodle/mod/forum/discuss.php?d=13. 


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