and powering up a fan filter unit with HEPA filtration at the top to maintain negative pressure and air flow in one direction towards the patient room. 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. Converting patient room into negative pressure isolation room in an hour with SG-SPARC to cope with sudden surge during pandemic T01:53:55.0000000Z. 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. 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. Image courtesy of RTM Engineering Consultants
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