ACPH stands for

• A. Air Changes Per Hour
• B. Air Changes Per Humidity
• C. Aerosol Containment Processing Hazard
• D. Containment Primary Engineering Control

Answer: (A)

Air Changes Per Hour measures how many times the air in a space is replaced in one hour. In hazardous drug management, this ventilation rate is key because it helps dilute and remove airborne drug particles, reducing staff exposure and supporting containment within the work environment and its engineering controls. While higher ACH generally improves contaminant removal, it must be implemented with proper airflow patterns and pressure differentials to be effective.

The other options don’t fit: humidity isn’t described in terms of air changes, so “Air Changes Per Humidity” isn’t a valid term; “Aerosol Containment Processing Hazard” isn’t a standard concept in this context; and “Containment Primary Engineering Control” refers to the containment equipment itself rather than a rate or measurement. Therefore, ACPH stands for Air Changes Per Hour.