What is the purpose of negative air machines and HEPA filtration in ICRA?

• A. To humidify the air in patient rooms.
• B. To power heavy machinery.
• C. To cool equipment in construction zones.
• D. To create and maintain negative pressure in containment areas and filter airborne contaminants, reducing spread of dust and pathogens.

Answer: (D)

The idea behind using negative air machines and HEPA filtration in ICRA is to control airflow and remove contaminants so they don’t spread beyond the work area. By creating negative pressure in a containment zone, air is drawn into the space rather than pushed out into adjacent areas. As that air passes through a HEPA filter, dust, spores, and many infectious particles are captured before the air is exhausted. This combination effectively reduces the concentration of airborne contaminants inside the work area and minimizes their escape, protecting patients and staff.

humidifying the air, powering heavy machinery, or cooling equipment are not functions of these systems; those roles belong to other equipment and are not the purpose of negative air machines and HEPA filtration in infection control.