Which practice helps preserve airflow around the sterile field?

• A. Do not block vents
• B. Keep sterile fields below vent levels
• C. Place large equipment in the airflow path
• D. Block vents temporarily to improve access

Answer: (A)

Airflow management in the operating room relies on a clean downward laminar flow coming from ceiling supply vents. This steady, directed air helps sweep airborne contaminants away from the sterile field. When vents are blocked by hands, instruments, drapes, or equipment, that designed airflow is interrupted, creating turbulence and pockets where particles can linger near the sterile area. Keeping vents unobstructed ensures the airflow reaches the sterile field consistently and carries contaminants away as intended.

Blocking vents even temporarily to gain access would disrupt the clean air delivery, producing turbulence that can draw contaminants toward the sterile field. Placing large equipment in the airflow path similarly disrupts the laminar flow and can create areas of stagnant air. While some might think adjusting the position of the sterile field relative to vents could help, the most reliable way to preserve airflow is to keep the vents clear, ensuring an uninterrupted downward sweep of clean air over the sterile field.