Certified Health Care Facility Manager (CHFM)

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An Airborne Infection Isolation (AII) room is being designed to prevent the spread of infectious agents. According to ASHRAE Standard 170, Ventilation of Health Care Facilities, what is the primary air pressure relationship and minimum total air exchange requirement for this type of room?

Negative pressure relative to adjacent areas; minimum 12 total ACH. Positive pressure relative to adjacent areas; minimum 6 total ACH. Balanced pressure with adjacent areas; minimum 10 total ACH. Positive pressure relative to adjacent areas; minimum 15 total ACH.

Correct Answer:

Negative pressure relative to adjacent areas; minimum 12 total ACH.

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