Which of the following is required for PE (Protective Environment) rooms?

For Protective Environment (PE) rooms, maintaining a specific air pressure is crucial for preventing airborne infections, especially for immunocompromised patients. The correct choice emphasizes the need for positive air pressure. This positive pressure ensures that any air that may escape the room is prevented from entering from adjoining areas, which is essential for minimizing the risk of airborne pathogens entering the space.

Additionally, the requirement for all air supply to pass through HEPA filters with 99.97% efficiency further enhances the air quality within the PE room. HEPA filters effectively trap a significant percentage of airborne particles, including bacteria and viruses, thereby providing a safer environment for vulnerable patients.

This capability to filter airborne contaminants, coupled with the positive pressure management, is what defines the operational standard for PE rooms, ensuring that patients are adequately protected against infections that could compromise their health.