JUNE 2021 A S H R A E J O U R N A L THE MAGAZINE OF HVAC&R TECHNOLOGY AND APPLICATIONS ASHRAE.ORG HFC Phasedown & What's Ahead For Refrigerants also Minimizing COVID-19 Transmission Managing Aerosols Using Space Flushing Improving the PUE Metric HVAC Design for Humid vs. Arid Climateshttp://www.ASHRAE.ORG