ACPH stands for what measurement?

• A. Ambient Contamination Prevented Hour
• B. Average Cleanliness Per Hour
• C. Active Cleanliness per Hour
• D. Air Changes Per Hour

Answer: (D)

Air Changes Per Hour describes how many times the air in a space is replaced in one hour. This ventilation metric is key in hazardous drug management because it governs how quickly airborne contaminants are diluted and removed, and it helps establish proper containment and pressure relationships in compounding areas and containment devices. That’s why this acronym stands for Air Changes Per Hour. The other phrases aren’t standard terms used to measure ventilation in pharmaceutical settings. Higher ACH means faster air turnover, which can reduce exposure but also increases energy use.