This also serves as a viable option for increasing airflow in emergency department waiting rooms or radiology waiting rooms when it is impractical to exhaust the air directly outdoors. When the HEPA filter unit is used to increase only the ventilation rate, airflow from the HEPA filter unit is ducted back into the room. These units can be used to increase only the ventilation rate of a room or to increase both the ventilation rate and negative pressure without the need for additional exhaust. This generally is accomplished with a recirculating HEPA filter unit. Fortunately, American Society of Heating, Refrigerating and Air-Conditioning Engineers' Standard 170, Ventilation of Health Care Facilities, allows for using recirculated room air provided that the air first passes through a minimum-efficiency reporting value 17 high-efficiency particulate air (HEPA) filter. HEPA to return and multi-bed zone within Portable isolation exhaust air. Developed to address SARS-CoV-2 and other microscopic airborne pathogens. When retrofitting a standard patient room for use as a negative-pressure isolation room, it is not often practical to exhaust the air directly outdoors as required. powerful negative pressure and exhaust air models are the ideal for healthcare facilities in need of creating a safe and affordable isolation room or isolation wing. Image courtesy of RTM Engineering Consultants
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