In the sterile processing area design, which airflow-related recommendation should the infection preventionist emphasize?

• A. Area should have a positive airflow.
• B. Humidity should be between 60 and 80 percent.
• C. Return air registers should be near the ceiling.
• D. Temperature should be above 80 degrees Fahrenheit.

Answer: (A)

Maintaining proper air pressure in sterile processing areas is essential to protect the cleanliness of the environment. Having a positive airflow means the clean area is kept at a higher pressure than surrounding spaces, so air tends to flow from the clean zone to less clean areas. This outward flow helps prevent contaminants from entering the sterile processing area, helping to keep processed items uncontaminated as they are decontaminated, packaged, and stored.

Humidity set too high—like 60–80 percent—can promote microbial growth and condensation, which is undesirable in sterile areas. Temperature above 80°F is uncomfortable for staff and can affect materials and procedures, but it doesn’t address contamination control. The detail about return air registers near the ceiling is more about airflow design than about maintaining a clean-to-contaminated pressure relationship, which is the key infection prevention principle here.