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03 <br />Assessment Overview <br />Assessment Overview <br />The U.S. Centers of Disease Control and Prevention (CDC) and World Health Organization (WHO) <br />both published recommendations for occupying workplaces in areas with a COVID-19 outbreak' 2. In <br />addition, two leading industry trade associations, ASHRAE and REHVA, published guidance for <br />operating building HVAC systems under these circumstances.s a <br />DILUTE <br />EXHAUST <br />ASHRAE Guidelines <br />Proper ventilation ensures that plenty of fresh, outdoor air comes into the building to <br />dilute the buildup of indoor contaminants. Adjusting building ventilation is one tool that <br />can influence indoor air quality. <br />Getting exhaust air out efficiently is equally important — including recirculated air from <br />kitchens, restrooms, and combustion systems. <br />OMaintaining indoor humidity levels within the ASHRAE recommended range maximizes <br />+ the comfort of building occupants while avoiding the likelihood of harmful microbial <br />CONTAIN growth in the building. <br />4 An increasing concern is the HVAC system's ability to reduce microorganisms, such as <br />+ mold, bacteria, and viruses. <br />CLEAN <br />Interim Guidance for Businesses and Employers to Plan and Respond to COVID-19, CDC <br />2 Getting your workplace ready for COVID-19, WHO, dated 3 March 2020 <br />3 ASHRAE Position Document on Infectious Aerosols, dated 14 April 2020 <br />4 REHVA COVID-19 guidance document, dated 3 April 2020 <br />