Analysis of Airflow Paths and Contaminant Removal Effectiveness

Air Change Rates are often specified assuming well mixed conditions in the spaces to achieve overall dilution of contaminants. Actual distribution of contaminants in the space are seldom uniform and depends on several factors including the locations of air supply and returns, strengths and location of contaminant sources, and strength and locations of heat sources. The flow path of contaminants in the space play important role in determining the concentration levels and overall effectiveness of contaminant removal. This presentation demonstrates how airflow paths affect the effectiveness of contaminant removal in patient rooms, cleanrooms, and laboratories.