The Elimination of the Return line from the HVAC systems due to COVID-19

Due to the spread of the deadly COVID-19 virus in the US and around the world, the authors propose the elimination of the return line from the HVAC (Heating, Ventilation, and Air conditioning) systems [1], simply by closing the return air damper (RAD) shown Figure 1 that represents a single zone HVAC system. The idea of closing the RAD may be applied to other Design systems such as variable air volume, terminal air reheat, dual duct flow, . . .etc.