By Scott M. Katzer, P.E., CFEI COVID-19 CDC guidelines relating to modifying HVAC systems state as follows1: Consider improving the engineering controls using the building ventilation system. This may include some or all of the following activities: Increase ventilation rates. Increase the percentage of outdoor air that circulates into the system. These recommendations do not appear to consider the building’s climate location as outdoor moisture quantities are different, particularly in warmer climates. Increasing building ventilation… Read More