Infection Control Risk Assessment Class IV is focused on construction barriers to prevent dust and potentially dangerous pathogens from entering patient care areas. Negative air pressure within the workspace is critical in ensuring that the air flows from “clean” undisturbed patient areas to the “dirty” work area preventing the escape of potential pathogens into the patient occupied space. While this is primarily focused on construction and renovation activities these same precautions must be considered when expanding patient care areas to accommodate a surge in COVID-19 patients.