An airborne infection isolation room in newly built accommodation must provide how many air exchanges per hour?

1. An airborne infection isolation room is a single-patient room with special air handling and ventilation capacity. 2. New construction and renovation must deliver 12 air exchanges per hour. 3. Existing facilities are held to 6 air exchanges per hour, which is the trap in this item. 4. The question names newly built accommodation, so the higher figure of 12 applies. 5. Eighteen and twenty four exchanges per hour are not part of the standard for these rooms. 6. The room also holds monitored negative pressure and exhausts air outside or through a HEPA filter before return. _Source: CDC Guideline for Isolation Precautions: Preventing Transmission of Infectious Agents in Healthcare Settings (2007), Part III, section III.B.3. Airborne precautions_