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Discussing COVID-19 CDC Guidelines for HVAC Systems

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

Ahead of the Blower Curve Aprilaire Publishes Humidifier Performance Guidelines for ECM Motors

Beginning July 3, 2019, the DOE is requiring a maximum fan energy rating (FER) for furnace fans. The goal of this mandate is to reduce energy consumption as well as CO2 emissions. To comply with the new standards, furnace manufacturers are eliminating permanent split capacitor (PSC) motors and moving to electronically commutated motors (ECM). This will result in substantial energy savings and improved system performance. Aprilaire concludes that the performance of all types of whole… Read More
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