How many air exchanges are required per hour in the operating room?

How many air exchanges are required per hour in the operating room?

• A. 15
• B. 10
• C. 20-25
• D. 30

Answer: (A)

Ventilation in the operating room is expressed as air exchanges per hour (ACH), which tells you how often the room air is replaced. A minimum of 15 air changes per hour is used as a standard to keep the environment dilute of airborne contaminants and to help maintain a positive pressure relative to surrounding spaces, reducing the chance that outside contaminants enter the sterile field. With 15 ACH, the room’s air is refreshed relatively frequently—roughly every four minutes—which helps remove surgical aerosols, smoke, and other particulates produced during procedures. Choices like 10 ACH would dilute contaminants more slowly, increasing risk, while much higher rates (20–25 or 30) are more about enhanced control and energy use and aren’t the baseline standard in most settings. Therefore, 15 air exchanges per hour is the best answer.

Ventilation in the operating room is expressed as air exchanges per hour (ACH), which tells you how often the room air is replaced. A minimum of 15 air changes per hour is used as a standard to keep the environment dilute of airborne contaminants and to help maintain a positive pressure relative to surrounding spaces, reducing the chance that outside contaminants enter the sterile field. With 15 ACH, the room’s air is refreshed relatively frequently—roughly every four minutes—which helps remove surgical aerosols, smoke, and other particulates produced during procedures. Choices like 10 ACH would dilute contaminants more slowly, increasing risk, while much higher rates (20–25 or 30) are more about enhanced control and energy use and aren’t the baseline standard in most settings. Therefore, 15 air exchanges per hour is the best answer.